Weekly Information about Bright Comets (2021 Oct. 23: North)

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Updated on October 31, 2021
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Best time and the azimuth, altitude (A,h) are at lat. 35 deg in the Northern Hemisphere.
Azimuth indicates 0 for south, 90 for west, 180 for north, 270 for east.

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* 67P/Churyumov-Gerasimenko

Now it is bright as 10.1 mag (Oct. 13, Marco Goiato). It will brighten up to 9 mag, and will be observable in good condition in winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   6 38.90   25 31.4   0.433   1.217   110    9.6   4:33 (  0, 80)  
Oct. 30   7  9.02   26  9.9   0.424   1.211   110    9.3   4:36 (  0, 81)  

* 8P/Tuttle

It brightened very rapidly. Now it is very bright as 9.5 mag (Oct. 13, Marco Goiato). It stays bright as 8-9 mag until October. The condition is bad in this apparition. In the Southern Hemisphere, it stays observable after this while the comet will be fading. But it stays locating low. It is not observable after this in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  11 55.74  -35 39.7   2.003   1.325    35    9.6   4:48 (307,-10)  
Oct. 30  12 21.86  -39  7.4   2.067   1.390    35   10.0   4:53 (311,-11)  

* 6P/d'Arrest

Now it is bright as 11.6 mag (Oct. 4, Carlos Labordena). It is observable at 10 mag in good condition from October to December. In the Northern Hemisphere, it locates somewhat low at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  20  8.99  -31 35.2   1.038   1.414    88    9.9  18:40 (  8, 23)  
Oct. 30  20 36.47  -31 47.3   1.095   1.439    86    9.9  18:33 (  7, 23)  

* 4P/Faye

Now it is bright as 10.9 mag (Oct. 17, Osamu Miyazaki). It stays observable at 10-11 mag in excellent condition from summer to autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   6 38.80   12 59.3   1.061   1.680   109   10.4   4:33 (  0, 68)  
Oct. 30   6 46.73   11 53.3   1.031   1.701   114   10.4   4:14 (  0, 67)  

* C/2019 L3 ( ATLAS )

Now it is 10.5 mag (Oct. 14, Osamu Miyazaki). It stays bright as 10 mag until spring for a long time. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it locates extremely low until November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   7 44.00   41 17.0   3.343   3.626    98   10.5   4:48 (234, 78)  
Oct. 30   7 46.18   40 40.7   3.234   3.614   104   10.4   4:53 (214, 83)  

* C/2021 A1 ( Leonard )

Now it is 12.3 mag (Oct. 10, Michael Jager). It will approach to Earth down to 0.2 a.u. in December, and it is expected to brighten up to 4 mag. In the Northern Hemisphere, it stays observable in good condition for a long time until December while the comet is brightening gradually. In the Southern Hemisphere, it is not observable until mid December.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  11 40.30   35 36.8   1.844   1.529    55   11.7   4:48 (247, 33)  
Oct. 30  11 48.59   35  2.3   1.628   1.422    60   11.1   4:53 (250, 37)  

* C/2017 K2 ( PanSTARRS )

Now it is bright as 11.6 mag (Oct. 3, Osamu Miyazaki). It is expected to be observable at 5-6 mag for a long time from 2022 to 2023. In the Northern Hemisphere, it is not observable at the high light from 2022 autumn to 2023 summer. In the Southern Hemisphere, it stays low for a while. But it will be observable in good condition at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  17  8.31   22 14.2   5.451   5.013    59   11.7  18:40 ( 90, 41)  
Oct. 30  17 12.00   21  1.1   5.450   4.952    55   11.6  18:33 ( 91, 37)  

* 19P/Borrelly

Now it is 13.4 mag (Oct. 8, Chris Wyatt). It will brighten rapidly up to 9 mag in winter. It will be observable in good condition. In the Southern Hemisphere, it is observable in excellent condition. In the Northren Hemisphere, it is not observable until November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  23  5.98  -54 54.9   1.202   1.752   105   12.0  20:58 (  0,  0)  
Oct. 30  23  4.12  -52 43.0   1.195   1.703   101   11.7  20:29 (  0,  3)  

* 57P/du Toit-Neujmin-Delporte

Major outburst occured on Oct. 17. Now it is very bright as 11.9 mag (Oct. 17, Francois Kugel). It stays observable in the evening sky for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  18 22.32  -21  1.7   1.872   1.721    65   11.8  18:40 ( 37, 24)  
Oct. 30  18 41.90  -20 55.0   1.924   1.724    63   11.9  18:33 ( 37, 24)  

* C/2020 T2 ( Palomar )

It brightened up to 9.5 mag in early summer (June 27, Marco Goiato). Now it is fading. But it is bright as 11.4 mag still now (Oct. 4, Carlos Labordena). It will be unobservable soon in the Northern Hemisphere, or in November in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  17  4.58  -28 21.7   2.932   2.392    48   11.8  18:40 ( 47,  8)  
Oct. 30  17 20.15  -29 25.9   3.031   2.434    45   12.0  18:33 ( 47,  6)  

* C/2021 O1 ( Nishimura )

It was observed at 9-10 mag from late July to early August. Now it is not observable. It will appear in the morning sky in December, but it will be fainter than 15 mag at that time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  13 46.30   -5 25.3   2.471   1.485     5   12.7   4:48 (267,-14)  
Oct. 30  14  2.60   -7 52.0   2.563   1.581     6   13.0   4:53 (271,-12)  

* C/2019 T4 ( ATLAS )

Now it is 13.8 mag (Oct. 9, Chris Wyatt). It is expected to brighten up to 11.5 mag in 2022. In the Southern Hemisphere, it stas observable in good condition for a long time, although it became extremely low temporarily from August to September. It is getting observable also in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  11  5.82  -25 26.2   5.349   4.646    41   13.1   4:48 (306,  5)  
Oct. 30  11 12.87  -25 54.3   5.276   4.623    44   13.1   4:53 (311,  9)  

* 29P/Schwassmann-Wachmann 1

Major outburst occured on Sept. 25. Now it is very bright as 11.3 mag (Oct. 17, Osamu Miyazaki).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   4 54.89   32 12.9   5.204   5.924   132   13.4   2:50 (  0, 87)  
Oct. 30   4 52.71   32 15.6   5.132   5.926   139   13.3   2:21 (  0, 87)  

* C/2020 J1 ( SONEAR )

It brightened up to 12.3 mag from spring to summer (June 15, Marco Goiato). Now it is fading. It has already faded down to 13.8 mag (Sept. 8, Chris Wyatt). Now it is not observable. It will be observable again at 14 mag in November in the Northern Hemisphere, or in January in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  14  4.53   -1 59.4   4.756   3.780    10   13.9  18:40 ( 94,-10)  
Oct. 30  14  7.80   -1 38.3   4.775   3.810    12   13.9   4:53 (265,-10)  

* 132P/Helin-Roman-Alu 2

Now it is 13.1 mag (Oct. 8, Toshihiko Ikemura, Hirohisa Sato). It is observable at 14 mag in excellent condition in autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   0 21.99   -3  7.8   0.754   1.705   153   14.0  22:14 (  0, 52)  
Oct. 30   0 23.71   -3 32.9   0.776   1.698   147   14.0  21:48 (  0, 52)  

* 22P/Kopff

Now it is not observable. In the Southern Hemisphere, it will appear in the morning sky at 11 mag in late January, then it stays observable at 11 mag until June. In the Northern Hemisphere, it will appear in the morning sky in December, but it stays locating extremely low for a long time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  13 53.81   -8 14.2   3.090   2.098     3   14.5  18:40 ( 91,-16)  
Oct. 30  14  8.80   -9 36.6   3.046   2.057     4   14.3   4:53 (272,-14)  

* 15P/Finlay

It brightened very rapidly up to 10.7 mag in July (July 20, Osamu Miyazaki). Now it is fading. It has already faded down to 15.9 mag (Oct. 8, Toshihiko Ikemura, Hirohisa Sato). It stays observable in the morning sky for a long time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   8 44.68   25 50.8   1.487   1.684    82   14.6   4:48 (283, 64)  
Oct. 30   8 52.56   25 49.3   1.474   1.750    88   15.1   4:53 (291, 69)  

* 9P/Tempel 1

It will brighten up to 12 mag from winter to spring. Now it is not observable. In the Northern Hemisphere, it will appear in the morning sky at 14 mag in November. In the Southern Hemisphere, it is not observable until January.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  12 42.65    2 48.8   2.874   1.986    21   14.8   4:48 (269,  4)  
Oct. 30  12 58.10    1  4.4   2.809   1.948    24   14.6   4:53 (273,  6)  

* C/2020 F5 ( MASTER )

Now it is 14.7 mag (Oct. 9, Chris Wyatt). It stays 14-15 mag until the end of 2021. In the Southern Hemisphere, it stays observable in good condition for a long time. It locates low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  22 26.27  -26 34.0   4.120   4.667   117   15.1  20:18 (  0, 29)  
Oct. 30  22 24.53  -25 28.1   4.236   4.688   111   15.1  19:49 (  0, 30)  

* 104P/Kowal 2

Now it is 17.1 mag (Oct. 8, Thomas Lehmann). It will brightens rapidly. And it is expected to be observable at 12-13 mag in good condition from December to February. However, it is much fainter than this ephemeris recently.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  21 41.52   -8 47.2   0.768   1.493   115   15.4  19:34 (  0, 46)  
Oct. 30  21 44.53   -9 29.7   0.767   1.436   108   15.1  19:10 (  0, 46)  

* C/2020 PV6 ( PanSTARRS )

Now it is 14.3 mag (Oct. 1, Toshihiko Ikemura, Hirohisa Sato). It will be fading after this. In the Northern Hemisphere, it stays observable in good condition for a long time, although it becomes extremely low temporarily in November. In the Southern Hemisphere, it is not observable until late January.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  16  6.41   18  8.0   2.913   2.315    44   15.1  18:40 ( 94, 26)  
Oct. 30  16  6.43   17 36.8   2.977   2.326    41   15.2  18:33 ( 97, 22)  

* 108P/Ciffreo

Now it is 14.3 mag (Oct. 4, Michael Jager). It stays 15 mag until November. It will be observable in excellent condition in the Northern Hemisphere. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   6 55.51   28 20.0   1.132   1.714   107   15.1   4:48 (355, 83)  
Oct. 30   7  5.73   29 27.3   1.096   1.732   111   15.2   4:33 (  0, 84)  

* 246P/NEAT

Now it is 14.9 mag (Oct. 6, Chris Wyatt). It stays 13-14 mag from 2020 to 2021. It will be observable in good condition after this in the Southern Hemisphere. It locates low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  19 24.92  -33 55.6   3.178   3.137    78   15.2  18:40 ( 18, 19)  
Oct. 30  19 33.58  -33 32.8   3.284   3.152    73   15.3  18:33 ( 20, 18)  

* C/2020 Y2 ( ATLAS )

Now it is 16.0 mag (Aug. 16, iTelescope Observatory, Siding Spring). It is expected to brighten up to 13 mag in 2022. In the Southern Hemisphere, it stays observable in good condition for a long time, although it becomes extremely low temporarily from September to October. In the Northern Hemisphere, it is not observable for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  12 32.00  -33  8.6   4.712   3.864    28   15.2   4:48 (301,-15)  
Oct. 30  12 35.34  -34 37.4   4.643   3.826    31   15.2   4:53 (305,-10)  

* 10P/Tempel 2

It brightened up to 10.1 mag in spring (Apr. 10, Marco Goiato). Now it is fading. It has already faded down to 15.3 mag (Oct. 14, Sandor Szabo). It stays observable in good condition for a long time after this while the comet will fading.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   4 48.67    6  7.2   1.624   2.435   135   15.2   2:44 (  0, 61)  
Oct. 30   4 43.37    5 47.4   1.612   2.478   143   15.3   2:11 (  0, 61)  

* C/2018 U1 ( Lemmon )

Now it is 15.9 mag (Oct. 8, Thomas Lehmann). It stays at 14-15 mag for a long time from 2021 to 2022. It will be unobservable from November to January.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  16 27.82  -20 58.5   5.727   4.994    39   15.3  18:40 ( 58,  7)  
Oct. 30  16 30.52  -21 48.3   5.799   4.993    32   15.3  18:33 ( 60,  3)  

* C/2019 F1 ( ATLAS-Africano )

Now it is 14.9 mag (Oct. 9, Chris Wyatt). It was expected to brighten up to 13 mag from spring to summer. But actually, it is fainter than originally expected. It will be fading slowly after this. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable until July in 2022.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  21 28.15  -74 31.4   3.708   3.762    85   15.3  19:22 (  0,-19)  
Oct. 30  21 38.64  -72 37.4   3.773   3.781    82   15.4  19:05 (  0,-17)  

* P/2021 Q5 ( ATLAS )

Bright new periodic comet. Now it is 14.5 mag (Oct. 8, Toshihiko Ikemura, Hirohisa Sato). It stays observable in good condition for a long time. It stays 14-15 mag until November. Juan Jose Gonzalez reported it is very bright as 11.8 mag on Oct. 7.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   9 42.09    6 13.7   1.499   1.390    64   15.3   4:48 (297, 42)  
Oct. 30   9 57.96    3 57.7   1.497   1.429    66   15.4   4:53 (303, 43)  

* 117P/Helin-Roman-Alu 1

Now it is 15.8 mag (Oct. 4, Thomas Lehmann). Now it is not observable. It will appear in the morning sky at 15 mag in January. Then it will brighten up to 13 mag in 2022 summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  14 55.36  -15 44.4   4.228   3.287    16   15.4  18:40 ( 76, -7)  
Oct. 30  15  5.33  -16 35.8   4.239   3.275    12   15.4  18:33 ( 76,-10)  

* C/2020 R7 ( ATLAS )

Now it is 16.2 mag (Oct. 1, Thomas Lehmann). It will brighten up to 12.5 mag in 2022 summer. In the Southern Hemisphere, it stays observable in excellent condition for a long time. In the Northern Hemisphere, it is not observable until August in 2022.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   1 34.20  -76 14.6   4.167   4.325    92   15.5  23:22 (  0,-21)  
Oct. 30   0 54.32  -76 28.4   4.179   4.279    89   15.4  22:15 (  0,-21)  

* 110P/Hartley 3

It brightened rapidly. Now it is 15.5 mag (Oct. 14, Sandor Szabo). It will be observable at 15 mag in excellent condition in winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   8 13.08   22 26.0   2.263   2.456    89   15.6   4:48 (300, 68)  
Oct. 30   8 20.68   21 39.1   2.177   2.457    94   15.6   4:53 (315, 72)  

* C/2019 U5 ( PanSTARRS )

Now it is 15.7 mag (Oct. 2, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 11 mag in 2023. In the Northern Hemisphere, it stays observable in good condition for a long time. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  16  9.67   34 38.0   6.262   5.775    56   15.7  18:40 (111, 34)  
Oct. 30  16 11.71   33 50.8   6.246   5.732    54   15.7  18:33 (112, 30)  

* C/2020 M5 ( ATLAS )

Now it is 15.9 mag (Sept. 24, D. Buczynski). In the Northern Hemisphere, it stays observable at 15-16 mag for a long time until early 2022, although it becomes extremely low temporarily from September to October. In the Southern Hemisphere, it is not observable until the end of 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  13  4.74   24 36.7   3.799   3.071    37   15.7   4:48 (248, 12)  
Oct. 30  13  8.09   23 10.0   3.773   3.086    40   15.7   4:53 (253, 17)  

* 7P/Pons-Winnecke

It brightened up to 9.7 mag in June (June 4, Michael Jager). Now it is fading. It has already faded down to 14.1 mag (Sept. 11, Chris Wyatt). In the Southern Hemisphere, it stays observable in excellent condition for a long time. In the Northern Hemisphere, it becomes extremely low after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  23 16.79  -41 21.5   1.430   2.076   116   15.7  21:09 (  0, 14)  
Oct. 30  23 19.29  -39 16.1   1.538   2.130   112   16.1  20:44 (  0, 16)  

* 284P/McNaught

Now it is 14.8 mag (Oct. 3, Michael Jager). It stays 15 mag until October, and it is observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  23  3.58  -17 16.7   1.544   2.313   129   15.7  20:56 (  0, 38)  
Oct. 30  23  5.83  -17 10.1   1.616   2.319   123   15.8  20:31 (  0, 38)  

* C/2021 K1 ( ATLAS )

Now it is 15.5 mag (Oct. 14, Sandor Szabo). It continues brightening even after the perihelion passage. It may stay 15-16 mag for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   0 58.62  -14 43.1   2.077   2.987   151   15.8  22:50 (  0, 40)  
Oct. 30   0 56.36  -14 51.2   2.154   3.023   145   15.9  22:20 (  0, 40)  

* C/2021 E3 ( ZTF )

Now it is 15.4 mag (Oct. 1, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 11 mag from spring to summer in 2022. In the Southen Hemisphere, it locates somewhat low in 2021, but it will be observable in good condition at the high light for a long time. In the Northern Hemisphere, it is observable in good condition in 2021, but it will not be observable at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  18 35.87    8 57.5   3.436   3.302    73   15.9  18:40 ( 57, 50)  
Oct. 30  18 37.25    6 52.2   3.480   3.239    67   15.8  18:33 ( 60, 45)  

* C/2020 V2 ( ZTF )

Now it is 16.6 mag (July 29, Thomas Lehmann). It is expected to brighten up to 10 mag in 2023. In the Northern Hemisphere, it stays observable in good condition until 2023 autumn, although it became extremely low temporarily in September. In the Southern Hemipshere, it stays unobservable until 2023 summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  12 39.87   34  0.2   6.668   6.051    48   15.9   4:48 (243, 21)  
Oct. 30  12 43.56   34 13.8   6.544   5.996    52   15.9   4:53 (245, 27)  

* 193P/LINEAR-NEAT

Now it is 16.0 mag (Oct. 8, Toshihiko Ikemura, Hirohisa Sato). It stays observable in good condition for a long time. But it will be fading after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  22 54.79    2  3.1   1.386   2.210   135   16.0  20:47 (  0, 57)  
Oct. 30  22 55.88    2 25.8   1.455   2.220   129   16.0  20:21 (  0, 58)  

* C/2021 A7 ( NEOWISE )

It brightened up to 14.2 mag in early summer (June 10, Thomas Lehmann). Now it is fading. In the Northern Hemisphere, it is appearing in the morning sky. In the Southern Hemisphere, it will never be observable again.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  12 53.76   27  8.9   2.967   2.307    40   16.0   4:48 (247, 15)  
Oct. 30  13  9.87   28 14.4   2.947   2.351    44   16.1   4:53 (248, 19)  

* C/2021 D2 ( ZTF )

Now it is 17.5 mag (Oct. 10, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 15.5 mag in winter. In the Northern Hemisphere, it stays observable in good condition for a long time. It is not observable at all in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  15 40.49   62 51.3   3.190   3.124    77   16.2  18:40 (146, 37)  
Oct. 30  15 43.23   62 25.2   3.152   3.101    77   16.1  18:33 (146, 34)  

* 402P/2020 Q3 ( LINEAR )

First return of a new periodic comet observed at 16 mag from 2003 to 2004. Now it is 17.0 mag (Sept. 27, ATLAS-MLO, Mauna Loa). It will brighten up to 16 mag in winter, and it will be observable in excellent condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   6 40.17    0 54.7   3.539   3.949   107   16.2   4:35 (  0, 56)  
Oct. 30   6 41.13    0 47.4   3.446   3.947   113   16.1   4:08 (  0, 56)  

* 106P/Schuster

Now it is 16.0 mag (Oct. 1, Toshihiko Ikemura, Hirohisa Sato). It will be fading after this, and it will be fainter than 18 mag in December. In the Northern Hemisphere, it stays observable in good condition for a long time. It locates extremely low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   8 15.40   33 45.8   1.332   1.677    91   16.2   4:48 (269, 73)  
Oct. 30   8 30.45   34 59.1   1.305   1.708    95   16.3   4:53 (266, 77)  

* C/2020 K1 ( PanSTARRS )

Now it is 16.2 mag (Oct. 1, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 11 mag in 2023. In the Northern Hemisphere, it is observable in good condition in 2021. But it is observable only until November in 2022. In the Southern Hemisphere, it locates extremely low in 2021. But it will be observable in good condition at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  17 34.16   27  0.7   6.282   5.956    66   16.3  18:40 ( 93, 48)  
Oct. 30  17 37.27   25 51.3   6.295   5.907    62   16.3  18:33 ( 93, 44)  

* C/2020 O2 ( Amaral )

Now it is 15.8 mag (Oct. 2, Toshihiko Ikemura, Hirohisa Sato). It will be unobservable in November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  16 56.91   -7 55.8   5.517   4.881    46   16.3  18:40 ( 63, 21)  
Oct. 30  17  1.89   -7 30.5   5.592   4.887    41   16.3  18:33 ( 66, 18)  

* C/2019 T3 ( ATLAS )

Now it is 16.2 mag (Oct. 7, Thomas Lehmann). It is observable at 16 mag from 2020 to 2021. It locates low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  21 34.94   30 18.7   5.636   6.170   118   16.5  19:27 (  0, 85)  
Oct. 30  21 32.89   28 45.2   5.726   6.183   113   16.6  18:57 (  0, 84)  

* C/2020 U5 ( PanSTARRS )

Now it is 17.0 mag (Oct. 2, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 16 mag in 2022. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it is not observable until 2023.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   9 16.87   61 16.6   3.981   4.101    89   16.6   4:48 (210, 55)  
Oct. 30   9 25.86   63 26.6   3.873   4.077    94   16.5   4:53 (204, 56)  

* 17P/Holmes

Outburst occured in early August, and it brightened up to 14.1 mag (Aug. 7, Michael Jager). Now it is fading. It has already faded down to 17.5 mag (Oct. 8, Toshihiko Ikemura, Hirohisa Sato). In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemipsphere, it stays locating extremely low after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   6  0.15   47 22.0   2.146   2.742   116   16.6   3:56 (180, 78)  
Oct. 30   5 59.20   47 59.0   2.103   2.771   122   16.7   3:27 (180, 77)  

* C/2019 T2 ( Lemmon )

It was expected to brighten up to 14.5 mag from spring to summer. But actually, it is fainter than expected. Now it is 16.4 mag (Oct. 4, ATLAS-MLO, Mauna Loa). In the Southern Hemisphere, it stays observable for a long time. In the Northern Hemisphere, it is not observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  11 42.35  -51 33.4   3.843   3.260    47   16.6   4:48 (322,-17)  
Oct. 30  11 47.83  -51 40.3   3.878   3.301    48   16.6   4:53 (325,-14)  

* 2010 OE101

Michael Jager detected its cometary activity on Sept. 25. Now it is bright as 16.2 mag (Oct. 3, Michael Jager). It approaches to Earth down to 0.35 a.u. in early October, and it is observable at 16 mag in excellent condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   0 36.26   -6 36.7   0.397   1.364   154   16.6  22:29 (  0, 48)  
Oct. 30   0 49.55  -10 17.8   0.432   1.378   147   17.0  22:15 (  0, 45)  

* C/2019 N1 ( ATLAS )

It brightened up to 11.6 mag in winter (Feb. 18, Thomas Lehmann). Now it is fading. It has already faded down to 15.8 mag (Sept. 15, Thomas Lehmann). In the Southern Hemisphere, it stays observable in good condition after this. In the Northern Hemisphere, it will never be observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   3  9.68  -70 26.4   3.919   4.161    97   16.6   1:05 (  0,-15)  
Oct. 30   2 44.72  -70  1.5   4.002   4.225    96   16.7   0:13 (  0,-15)  

* 52P/Harrington-Abell

Now it is 16.6 mag (Oct. 8, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 17 mag from autumn to winter. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it stays extremely low until November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  10 28.67   14 17.5   2.139   1.785    56   16.7   4:48 (279, 38)  
Oct. 30  10 44.32   12 22.4   2.095   1.793    58   16.7   4:53 (284, 40)  

* C/2019 O3 ( Palomar )

Now it is 16.6 mag (Oct. 3, Toshihiko Ikemura, Hirohisa Sato). It stays at 16-17 mag from 2020 to 2021. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it is not observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  18 20.66   47 58.9   8.966   8.919    84   16.8  18:40 (127, 60)  
Oct. 30  18 22.00   47 40.6   9.008   8.925    82   16.8  18:33 (125, 57)  

* 422P/2021 L1 ( Christensen )

First return of a new periodic comet which brightened up to 17 mag in 2006. Now it is 17.4 mag (Sept. 27, N. Paul, E. Cortes). It stays 17 mag from 2021 to 2022.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  21 35.61  -58  6.6   2.934   3.158    93   16.8  19:29 (  0, -3)  
Oct. 30  21 40.34  -56  9.8   2.992   3.150    89   16.9  19:06 (  0, -1)  

* 70P/Kojima

Now it is 17.3 mag (Oct. 2, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 15.5 mag, and will be observable in excellent condition in winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   9 42.43   13 26.9   2.196   2.011    66   16.9   4:48 (289, 46)  
Oct. 30   9 56.71   12 32.3   2.128   2.009    69   16.8   4:53 (294, 49)  

* 116P/Wild 4

Now it is 17.1 mag (Oct. 2, Toshihiko Ikemura, Hirohisa Sato). It will brighten rapidly, and it will be observable at 13.5 mag in good condition from winter to spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   9 14.86   19 36.1   2.913   2.813    74   17.1   4:48 (287, 55)  
Oct. 30   9 23.46   19  3.7   2.797   2.788    79   16.9   4:53 (294, 60)  

* 254P/McNaught

Now it is 16.4 mag (Sept. 27, ATLAS-MLO, Mauna Loa). It continues brightening even after the perihelion passage. It stays observable at 17 mag in good condition for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   5  9.73  -15  7.5   3.084   3.731   123   16.9   3:05 (  0, 40)  
Oct. 30   5  7.31  -15 39.0   3.048   3.749   128   16.9   2:35 (  0, 39)  

* C/2020 F7 ( Lemmon )

Now it is 17.7 mag (May 12, ATLAS-HKO, Haleakala). It brightened rapidly. It stays 17 mag for a long time from 2021 to 2022. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it will be observable only in extremely low sky from autumn to winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   9  9.14  -28 19.8   5.639   5.335    67   16.9   4:48 (329, 19)  
Oct. 30   9  9.03  -29 57.3   5.556   5.333    72   16.9   4:53 (336, 21)  

* C/2021 O3 ( PanSTARRS )

Now it is 17.5 mag (Oct. 1, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 4.5 mag in 2022 April. However, it is not observable at the high light. In the Northern Hemisphere, it stays observable until early February when it brightens up to 14 mag. Then it will appear at 6 mag in mid May, and it stays observable in good condition after that while the comet will be fading. In the Southern Hemisphere, it stays observable until December when it brightens up to 16 mag. But after that, it is not observable until 2022 August.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  22  4.84   17  8.6   2.567   3.246   125   17.2  19:57 (  0, 72)  
Oct. 30  22  0.53   15 19.1   2.562   3.155   118   17.0  19:25 (  0, 70)  

* P/2021 N2 ( Fuls )

Now it is 15.6 mag (Oct. 13, Sandor Szabo). It is observable at 16-17 mag in good condition in autumn. It is brighter than this ephemeris recently.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   2 20.26   15 56.8   2.813   3.799   171   17.0   0:16 (  0, 71)  
Oct. 30   2 16.85   15 18.3   2.805   3.798   178   17.0  23:41 (  0, 70)  

* 28P/Neujmin 1

Now it is 16.7 mag (Oct. 2, Toshihiko Ikemura, Hirohisa Sato). In the Northern Hemisphere, it stays observable in good condition after this while the comet will be fading. In the Southern Hemisphere, it stays locating extremely low for a long time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   5 23.86   41 44.9   2.241   2.921   124   17.2   3:19 (180, 83)  
Oct. 30   5 19.77   42 16.0   2.226   2.977   131   17.1   2:48 (180, 83)  

* C/2020 U4 ( PanSTARRS )

Now it is 18.4 mag (Oct. 2, Toshihiko Ikemura, Hirohisa Sato). It stays 17-18 mag for a long time from 2021 to 2022. It is observable in excellent condition in the Northern Hemisphere, It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   5  0.62   34 20.6   4.792   5.495   130   17.2   2:56 (  0, 89)  
Oct. 30   4 51.24   34 28.7   4.691   5.484   139   17.1   2:20 (  0, 90)  

* 241P/LINEAR

Now it is 17.2 mag (Sept. 20, Ken-ichi Kadota). In the Northern Hemisphere, it stays observable at 17 mag in good condition until winter. In the Southern Hemisphere, it stays locating extremely low for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   8 48.15   28 59.5   1.973   2.099    83   17.3   4:48 (276, 65)  
Oct. 30   8 57.27   27 51.3   1.921   2.126    87   17.3   4:53 (284, 69)  

* C/2019 K7 ( Smith )

Now it is 17.1 mag (Oct. 3, Toshihiko Ikemura, Hirohisa Sato). Fading slowly. In the Northern Hemisphere, it stays observable in good condition for a long time. It is not observable after this in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  16 20.00   48 12.4   6.234   5.936    68   17.4  18:40 (127, 40)  
Oct. 30  16 22.80   47 54.5   6.276   5.971    67   17.4  18:33 (127, 37)  

* C/2021 P4 ( ATLAS )

Now it is 17.6 mag (Oct. 10, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 11 mag in 2022 summer. In the Northern Hemisphere, it stays observable in good condition until 2022 June when it brightens up to 11 mag. But it is not observable after the high light. In the Souther Hemisphere, it is not observable until 2022 October.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  23 18.81   62 46.1   3.291   3.910   121   17.5  21:10 (180, 62)  
Oct. 30  23  5.89   62  5.3   3.229   3.837   121   17.4  20:29 (180, 63)  

* 430P/2021 Q2 ( Scotti )

First return of a new periodic comet which brightened up to 17 mag in 2011. Now it is 17.2 mag (Sept. 16, Catalina Sky Survey). It stays observable at 17 mag in good condition until 2022 spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  10 32.56   12 52.2   1.960   1.603    54   17.5   4:48 (280, 36)  
Oct. 30  10 52.32   11  4.2   1.905   1.588    56   17.4   4:53 (284, 38)  

* 230P/LINEAR

Now it is 18.4 mag (Oct. 10, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 16.5-17 mag in winter. In its last apparition in 2015, it brightened up to 13 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  21 46.92  -32 15.4   1.586   2.110   107   17.4  19:40 (  0, 23)  
Oct. 30  21 50.81  -31 35.7   1.623   2.070   101   17.4  19:16 (  0, 24)  

* 119P/Parker-Hartley

Now it is 17.1 mag (Oct. 2, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 15 mag in 2022 winter. In 2021, it stays observable in good condition while the comet will be brightening gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  22 22.58  -19  3.4   2.385   3.016   120   17.5  20:15 (  0, 36)  
Oct. 30  22 22.93  -18 49.7   2.446   2.990   113   17.5  19:48 (  0, 36)  

* C/2020 S4 ( PanSTARRS )

Now it is 17.4 mag (Sept. 29, ATLAS-HKO, Haleakala). It will brighten up to 14 mag in early 2023. It stays observable in good condition for a long time until spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   4 53.49    3  2.7   4.667   5.403   133   17.7   2:49 (  0, 58)  
Oct. 30   4 51.89    2 50.4   4.558   5.358   140   17.6   2:20 (  0, 58)  

* (3200) Phaethon

Now it is 18.7 mag (Oct. 14, Catalina Sky Survey). In the Northern Hemisphere, it stays observable at 17 mag in good condition from November to December. It locates low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   4 27.38   40 15.2   1.515   2.326   134   18.0   2:23 (180, 85)  
Oct. 30   4 13.13   40 19.6   1.433   2.306   143   17.7   1:42 (180, 85)  

* 424P/2021 L5 ( La Sagra )

First return of a new periodic comet which brightened up to 17 mag in 2012. Now it is 18.0 mag (Sept. 26, ATLAS-MLO, Mauna Loa). It is observable in excellent condition in the Southern Hemisphere. It locates low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  21 10.07  -29 38.5   0.762   1.367   101   17.8  19:04 (  0, 26)  
Oct. 30  21 30.69  -26 48.2   0.781   1.363    99   17.9  18:57 (  0, 28)  

* 274P/Tombaugh-Tenagra

Now it is 21.4 mag (Aug. 19, Pan-STARRS 1, Haleakala). In the Northern Hemisphere, it stays observable at 17 mag in good condition from November to March. It locates low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23   6  4.05   20  7.2   2.109   2.728   118   18.0   3:59 (  0, 75)  
Oct. 30   6  6.07   20 37.2   2.012   2.707   125   17.8   3:34 (  0, 76)  

* 395P/2020 H1 ( Catalina-NEAT )

Now it is 17.4 mag (Oct. 2, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 17-18 mag for a long time from 2021 to 2022.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  19 24.22  -18 48.2   4.127   4.081    80   17.8  18:40 ( 23, 33)  
Oct. 30  19 29.71  -18 40.6   4.225   4.078    74   17.9  18:33 ( 27, 32)  

* 378P/2019 E2 ( McNaught )

Now it is 18.1 mag (Oct. 2, Toshihiko Ikemura, Hirohisa Sato). It has passed the perihelion in 2020 October. At the discovery in 2005, it stayed bright for several years even after the perihelion passage. In this apparition, it may stay observable at 18 mag from 2021 to 2024.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  23 16.19  -28 59.0   3.414   4.070   125   17.9  21:08 (  0, 26)  
Oct. 30  23 15.30  -28 33.5   3.516   4.093   119   18.0  20:40 (  0, 27)  

* C/2020 S3 ( Erasmus )

It brightened up to 3 mag in December in the SOHO spacecraft images in 2020 December (Dec. 18, Hirohisa Sato). Now it is 17.6 mag (Oct. 1, Toshihiko Ikemura, Hirohisa Sato). It stays observable in good condition after this while the comet will be fading.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  23 10.31   12 38.1   3.891   4.706   141   17.9  21:02 (  0, 68)  
Oct. 30  23  7.79   11 53.0   4.037   4.781   133   18.1  20:32 (  0, 67)  

* 433P/(248370) 2005 QN173

Now it is 18.1 mag (Oct. 3, Michael Jager). Main-belt asteroid, but it has a long tail of 10 arcmin. It stays observable in good condition until winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 23  23 35.34   -2 41.3   1.645   2.518   143   19.9  21:27 (  0, 52)  
Oct. 30  23 34.10   -2 49.5   1.715   2.529   136   20.0  20:59 (  0, 52)  

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