Weekly Information about Bright Comets (2021 Dec. 18: North)

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 Updated on December 17, 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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* C/2021 A1 ( Leonard )

It brightened up to 5.1 mag in the morning sky (Dec. 12, Carlos Labordena). Then it brightened up to 3 mag in outburst on Dec. 14. Now it is bright as 3.4 mag (Dec. 16, Juan Jose Gonzalez). It turns to be observable in the evening low sky after this. It stays 3-5 mag in December. It stays observable until early January in the Northern Hemisphere, or until late January in the Southern Hemisphere. In the Southern Hemisphere, it becomes observable in the morning sky after late February. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  19 39.38  -25 21.6   0.324   0.709    26    4.6  18:21 ( 55,  3)  
Dec. 25  21  5.35  -33 23.5   0.566   0.648    38    5.4  18:25 ( 42,  5)

* 67P/Churyumov-Gerasimenko

Now it is very bright as 8.9 mag (Dec. 4, Marco Goiato). It stays 9 mag until January, and it is observable in good condition. A very long dust trail is detected. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18   9  1.83   27 44.0   0.447   1.339   135    8.9   3:16 (  0, 83)  
Dec. 25   9  2.04   28  9.1   0.461   1.377   141    9.0   2:49 (  0, 83)

* 19P/Borrelly

Now it is bright as 10.7 mag (Dec. 4, Marco Goiato). It stays bright as 9-10 mag until March. In the Southern Hemisphere, it is observable in excellent condition. It will be getting higher rapidly after this also in the Northren Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  23 52.22  -27 43.6   1.176   1.415    81    9.6  18:21 (  4, 28)  
Dec. 25   0  4.66  -23  3.7   1.179   1.386    79    9.4  18:25 (  9, 32)

* C/2019 L3 ( ATLAS )

Now it is 9.5 mag (Dec. 14, Chris Wyatt). It stays bright as 10 mag until spring for a long time. It stays observable in good condition for a long time. It locates somewhat low in the Southern Hemisphere, 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18   7 26.76   35 15.2   2.647   3.560   154    9.9   1:42 (180, 90)  
Dec. 25   7 19.90   34  8.9   2.609   3.557   161    9.8   1:08 (  0, 89)

* C/2017 K2 ( PanSTARRS )

Now it is bright as 11.1 mag (Nov. 11, 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 becomes extremely low temporarily in December, but it will be getting higher again after January. However, it is not observable at the high light from 2022 autumn to 2023 summer. In the Southern Hemisphere, it is not observable until February. 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)  
Dec. 18  17 46.32   14 28.5   5.257   4.520    37   11.2  18:21 (105,  4)  
Dec. 25  17 51.93   13 50.7   5.197   4.458    37   11.1   5:35 (258,  7)

* 6P/d'Arrest

Now it is bright as 10.6 mag (Nov. 27, Marco Goiato). 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)  
Dec. 18  23 19.87  -23 18.4   1.636   1.694    76   11.2  18:21 ( 13, 31)  
Dec. 25  23 38.55  -21 24.0   1.730   1.739    74   11.6  18:25 ( 17, 32)

* 4P/Faye

Now it is bright as 11.7 mag (Dec. 15, Osamu Miyazaki). It stays observable in good condition for a long time. But it will be fading gradually after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18   6 45.68    7  5.3   0.956   1.904   157   11.3   1:01 (  0, 62)  
Dec. 25   6 39.97    7  9.3   0.979   1.939   162   11.5   0:27 (  0, 62)

* C/2019 T4 ( ATLAS )

Now it is 13.4 mag (Dec. 14, Chris Wyatt). It is expected to brighten up to 11.5 mag in 2022. It stas observable in good condition for a long time. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  11 53.44  -28 56.5   4.602   4.479    76   12.5   5:31 (351, 25)  
Dec. 25  11 57.46  -29 14.5   4.489   4.461    82   12.5   5:35 (358, 26)

* 104P/Kowal 2

Now it is 14.7 mag (Nov. 24, Ken-ichi Kadota). Brightening rapidly. It is expected to be observable at 12-13 mag in good condition from December to February. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  23 17.12   -7 54.5   0.715   1.123    81   12.8  18:21 ( 18, 46)  
Dec. 25  23 39.82   -6 39.9   0.699   1.099    79   12.5  18:25 ( 22, 46)

* 22P/Kopff

In the Northern Hemisphere, it stays extremely low until spring. 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. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  16 10.66  -18  2.6   2.667   1.794    22   12.8   5:31 (294,  3)  
Dec. 25  16 30.66  -18 54.7   2.610   1.761    24   12.5   5:35 (297,  4)

* 9P/Tempel 1

Now it is 15.5 mag (Nov. 14, Ken-ichi Kadota). It will brighten up to 12 mag from winter to spring. In the Northern Hemisphere, it is appearing in the morning sky. In the Southern Hemisphere, it is not observable until January. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  14 58.43  -11 12.0   2.334   1.715    40   13.3   5:31 (301, 20)  
Dec. 25  15 17.69  -12 50.0   2.269   1.687    42   13.1   5:35 (304, 21)

* 57P/du Toit-Neujmin-Delporte

Major outburst occured on Oct. 17. Now it is very bright as 11.9 mag (Nov. 27, Toshihiko Ikemura, Hirohisa Sato). In the Southern Hemisphere, it becomes unobservable in late December. In the Northern Hemisphere, it stays observable until early February. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  20 58.92  -15 52.1   2.339   1.811    46   13.2  18:21 ( 50, 22)  
Dec. 25  21 17.49  -14 38.3   2.404   1.832    44   13.4  18:25 ( 53, 21)

* 8P/Tuttle

It brightened very rapidly, and brightened up to 8.9 mag (Sept. 11, Chris Wyatt). Now it is fading. But it is bright as 10.4 mag still now (Nov. 13, Chris Wyatt). 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)  
Dec. 18  15 16.04  -51 59.0   2.527   1.883    39   13.2   5:31 (327,-11)  
Dec. 25  15 37.44  -52 42.0   2.578   1.955    41   13.7   5:35 (329,-11)

* 29P/Schwassmann-Wachmann 1

Major outburst occured on Sept. 25, and it brightened up to 10.0 mag (Oct. 1, Toshihiko Ikemura, Hirohisa Sato). Now it is fading. But it is bright as 10.8 mag still now (Dec. 2, Toshihiko Ikemura, Hirohisa Sato). 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18   4 28.17   31 30.5   4.998   5.940   161   13.3  22:39 (  0, 87)  
Dec. 25   4 24.81   31 16.2   5.038   5.942   154   13.3  22:08 (  0, 86)

* C/2020 T2 ( Palomar )

It brightened up to 9.5 mag in early summer (June 27, Marco Goiato). Now it is fading. It has already faded down to 12.7 mag (Nov. 22, Thomas Lehmann). Now it is not observable. In the Southern Hemisphere, it will appear in the morning sky at 15 mag in late February. In the Northern Hemisphere, it is not observable until June when the comet will fade down to 17 mag. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  19  9.61  -33 12.5   3.661   2.769    21   13.5  18:21 ( 55, -8)  
Dec. 25  19 24.69  -33 18.7   3.736   2.821    18   13.7  18:25 ( 56,-10)

* 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 14.1 mag (Nov. 23, Ken-ichi Kadota). In the Northern Hemisphere, it is appearing in the morning sky. It is not observable until January in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  14 26.49    2 21.8   4.535   4.038    54   14.0   5:31 (296, 35)  
Dec. 25  14 27.83    3 16.7   4.457   4.073    61   14.0   5:35 (302, 41)

* C/2020 Y2 ( ATLAS )

Now it is 15.1 mag (Dec. 14, Chris Wyatt). 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. In the Northern Hemisphere, it becomes observable temporarily in the extremely low sky in December. But it becomes unobservable again soon. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  12 49.43  -47 59.2   3.942   3.584    61   14.5   5:31 (345,  4)  
Dec. 25  12 48.38  -50 22.4   3.824   3.553    66   14.4   5:35 (350,  4)

* 132P/Helin-Roman-Alu 2

Now it is 13.1 mag (Nov. 27, Toshihiko Ikemura, Hirohisa Sato). It stays 13-14 mag unil December, and it is observable in excellent condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18   1 14.54    0 23.9   1.107   1.727   111   14.5  19:27 (  0, 56)  
Dec. 25   1 26.15    1 38.7   1.175   1.742   107   14.7  19:11 (  0, 57)

* C/2021 O1 ( Nishimura )

It was observed at 9-10 mag from late July to early August. Although it had been unobservable for a long time, it is appearing in the morning sky now. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  15 33.65  -19 48.7   3.037   2.241    30   14.9   5:31 (301,  8)  
Dec. 25  15 43.91  -20 59.7   3.074   2.332    34   15.1   5:35 (306, 11)

* C/2020 V2 ( ZTF )

Now it is 14.1 mag (Nov. 28, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 10 mag in 2023. In the Northern Hemisphere, it stays observable in good condition until 2023 autumn. In the Southern Hemipshere, it stays unobservable until 2023 summer. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  13  4.38   38 52.2   5.521   5.607    89   15.2   5:31 (252, 68)  
Dec. 25  13  5.86   40  2.8   5.369   5.551    95   15.1   5:35 (247, 74)

* 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)  
Dec. 18  16 20.05  -21 43.6   4.110   3.197    19   15.2   5:31 (296, -1)  
Dec. 25  16 31.12  -22 18.2   4.063   3.186    23   15.1   5:35 (299,  2)

* 110P/Hartley 3

It brightened rapidly. Now it is 15.6 mag (Nov. 28, Toshihiko Ikemura, Hirohisa Sato). It is observable at 15 mag in excellent condition in winter. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18   8 39.76   16 46.6   1.664   2.484   138   15.1   2:54 (  0, 72)  
Dec. 25   8 36.89   16 15.6   1.617   2.491   145   15.1   2:24 (  0, 71)

* C/2020 R7 ( ATLAS )

Now it is 16.1 mag (Nov. 22, 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. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  22 25.51  -68  1.1   4.346   3.967    61   15.2  18:21 ( 10,-15)  
Dec. 25  22 21.36  -66 27.1   4.363   3.924    57   15.1  18:25 ( 14,-15)

* C/2021 E3 ( ZTF )

Now it is 14.9 mag (Nov. 28, Thomas Lehmann). It is expected to brighten up to 11 mag from spring to summer in 2022. In the Southen Hemisphere, it is not observable until February, but it stays observable in good condition for a long time after that. In the Northern Hemisphere, it is hardly observable after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  19  4.67   -4 41.7   3.638   2.799    27   15.3  18:21 ( 78,  9)  
Dec. 25  19 10.37   -5 59.6   3.624   2.738    22   15.2  18:25 ( 81,  3)

* C/2019 U5 ( PanSTARRS )

Now it is 15.9 mag (Nov. 17, A. Diepvens). 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, although it became low temporarily in November. It is not observable in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  16 30.63   30 55.1   5.906   5.433    56   15.2   5:31 (249, 26)  
Dec. 25  16 33.32   30 54.6   5.825   5.391    59   15.2   5:35 (252, 31)

* 116P/Wild 4

Now it is 15.4 mag (Dec. 3, 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)  
Dec. 18  10  5.65   16 31.3   2.004   2.617   118   15.5   4:20 (  0, 71)  
Dec. 25  10  8.02   16 28.0   1.904   2.594   124   15.2   3:55 (  0, 71)

* 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 is not observable from November to January. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  16 55.17  -27 27.6   5.966   5.005    11   15.4   5:31 (296,-11)  
Dec. 25  16 58.93  -28 16.6   5.938   5.009    17   15.4   5:35 (300, -7)

* C/2020 F5 ( MASTER )

Now it is 15.2 mag (Nov. 29, Toshihiko Ikemura, Hirohisa Sato). It will be fading after this. 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)  
Dec. 18  22 32.32  -17 28.8   5.146   4.855    67   15.7  18:21 ( 28, 33)  
Dec. 25  22 35.58  -16 20.5   5.272   4.881    61   15.8  18:25 ( 35, 31)

* C/2020 M5 ( ATLAS )

Now it is 15.5 mag (Dec. 4, Toshihiko Ikemura, Hirohisa Sato). In the Northern Hemisphere, it stays observable at 15-16 mag for a long time until early 2022. It is appearing in the morning sky also in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  13 19.48   15 41.1   3.338   3.229    75   15.8   5:31 (298, 56)  
Dec. 25  13 18.34   14 57.6   3.249   3.255    81   15.7   5:35 (309, 61)

* C/2020 PV6 ( PanSTARRS )

Now it is 15.1 mag (Nov. 10, Ken-ichi Kadota). It will be fading after this. In the Northern Hemisphere, it stays observable in good condition for a long time, although it became 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)  
Dec. 18  16 13.11   18 10.8   3.034   2.469    46   15.8   5:31 (264, 23)  
Dec. 25  16 13.57   18 56.1   2.990   2.498    51   15.8   5:35 (267, 30)

* C/2019 F1 ( ATLAS-Africano )

Now it is 15 mag (Oct. 31, Giuseppe Pappa). 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. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  22 50.68  -58 26.5   4.277   3.938    63   15.8  18:21 ( 10, -5)  
Dec. 25  23  0.48  -56 24.7   4.352   3.964    60   15.9  18:25 ( 14, -4)

* 402P/2020 Q3 ( LINEAR )

First return of a new periodic comet observed at 16 mag from 2003 to 2004. Now it is 16.0 mag (Nov. 27, Toshihiko Ikemura, Hirohisa Sato). It stays 16 mag until March, and it stays observable in excellent condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18   6 26.29    2  3.4   3.018   3.938   156   15.8   0:41 (  0, 57)  
Dec. 25   6 22.06    2 38.6   3.004   3.938   159   15.8   0:09 (  0, 58)

* C/2020 K1 ( PanSTARRS )

Now it is 16.0 mag (Nov. 5, Ken-ichi Kadota). It is expected to brighten up to 11 mag in 2023. In the Northern Hemisphere, it is observable only until November in 2022. In the Southern Hemisphere, it is not observable until February. 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)  
Dec. 18  18  6.93   19 44.5   6.240   5.568    43   15.9  18:21 (107, 11)  
Dec. 25  18 11.77   19 10.6   6.204   5.520    42   15.9   5:35 (251,  6)

* 246P/NEAT

Now it is 15.4 mag (Nov. 21, ATLAS-MLO, Mauna Loa). It will be fading slowly after this. It will be unobservable in December. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  20 43.98  -29 48.4   3.939   3.259    40   15.9  18:21 ( 43,  9)  
Dec. 25  20 54.72  -29  7.7   4.014   3.275    36   15.9  18:25 ( 47,  7)

* C/2021 O3 ( PanSTARRS )

Now it is 16.9 mag (Dec. 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)  
Dec. 18  22  4.07    4 57.7   2.645   2.482    69   16.1  18:21 ( 51, 48)  
Dec. 25  22  8.93    3 59.7   2.649   2.379    63   15.9  18:25 ( 57, 43)

* P/2021 N2 ( Fuls )

Brightened rapidly. Now it is 15.7 mag (Nov. 27, Toshihiko Ikemura, Hirohisa Sato). It is observable at 15.5-16 mag in good condition until winter. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18   2  2.67   11 37.3   3.133   3.802   126   15.9  20:14 (  0, 67)  
Dec. 25   2  3.39   11 23.5   3.222   3.805   119   15.9  19:47 (  0, 66)

* 108P/Ciffreo

Now it is 15.7 mag (Nov. 28, Toshihiko Ikemura, Hirohisa Sato). It will be fading after this, and it will be fainter than 18 mag in February. 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)  
Dec. 18   7 16.99   38 33.0   0.982   1.918   154   16.0   1:32 (180, 87)  
Dec. 25   7 10.43   39 32.3   0.999   1.952   159   16.3   0:58 (180, 86)

* 70P/Kojima

Now it is 16.7 mag (Dec. 11, 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)  
Dec. 18  11 20.40    7 19.8   1.658   2.042    97   16.1   5:31 (358, 62)  
Dec. 25  11 29.12    6 57.8   1.595   2.053   102   16.1   5:15 (  0, 62)

* C/2020 U5 ( PanSTARRS )

Now it is 16.8 mag (Nov. 28, 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)  
Dec. 18  10 39.46   82 11.5   3.408   3.930   115   16.1   4:54 (180, 43)  
Dec. 25  10 58.99   85  0.6   3.395   3.912   114   16.1   4:46 (180, 40)

* C/2020 H6 ( ATLAS )

It stays observable at 16 mag from 2021 to 2022. Appearing in the morning sky in the Northern Hemisphere. In the Southern Hemisphere, it will appear in the morning sky in January. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  15 31.51    8 15.5   5.388   4.743    44   16.3   5:31 (279, 26)  
Dec. 25  15 37.51    9  5.4   5.321   4.751    50   16.3   5:35 (282, 32)

* C/2021 P4 ( ATLAS )

Now it is 17.1 mag (Nov. 27, 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 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)  
Dec. 18  22 31.67   54 19.7   3.007   3.310    99   16.6  18:21 (146, 64)  
Dec. 25  22 34.30   53 22.2   2.994   3.233    95   16.5  18:25 (140, 61)

* 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 16.3 mag (Dec. 10, Toshihiko Ikemura, Hirohisa Sato). 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)  
Dec. 18   3 54.09    6 11.1   1.881   2.770   148   16.5  22:05 (  0, 61)  
Dec. 25   3 49.57    6 39.7   1.972   2.810   141   16.8  21:33 (  0, 62)

* 254P/McNaught

Now it is 15.8 mag (Nov. 27, Toshihiko Ikemura, Hirohisa Sato). It continues brightening even after the perihelion passage. It stays observable at 16-17 mag in good condition for a while. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18   4 36.34  -15 19.9   3.088   3.876   138   16.6  22:47 (  0, 40)  
Dec. 25   4 32.17  -14 37.8   3.141   3.895   134   16.7  22:15 (  0, 40)

* C/2020 F7 ( Lemmon )

Now it is 16.4 mag (Nov. 14, F. Kugel, M. Audejean, J. Nicolas, J.-G. Bosch). 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)  
Dec. 18   8 44.77  -41 23.7   5.035   5.338   102   16.7   2:59 (  0, 14)  
Dec. 25   8 37.29  -42 46.5   4.985   5.341   106   16.7   2:24 (  0, 12)

* 52P/Harrington-Abell

Now it is 16.7 mag (Dec. 3, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 17 mag from autumn to winter. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  12 14.37   -0 42.1   1.769   1.907    82   16.7   5:31 (337, 52)  
Dec. 25  12 23.90   -2 22.0   1.720   1.931    86   16.8   5:35 (346, 52)

* C/2019 O3 ( Palomar )

Now it is 16.5 mag (Nov. 29, Toshihiko Ikemura, Hirohisa Sato). Fading slowly. 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)  
Dec. 18  18 41.37   47 12.9   9.231   8.973    71   16.7  18:21 (129, 30)  
Dec. 25  18 45.04   47 26.3   9.249   8.980    71   16.8  18:25 (131, 26)

* 284P/McNaught

It brightened up to 14.5 mag in autumn (Oct. 1, Ken-ichi Kadota). Now it is fading. It has already faded down to 16.3 mag (Nov. 27, Toshihiko Ikemura, Hirohisa Sato). It will be fading rapidly after this. It will be fainter than 18 mag in February. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  23 49.35  -12 16.0   2.235   2.390    86   16.8  18:21 (  6, 43)  
Dec. 25  23 58.37  -11 10.7   2.331   2.403    82   17.0  18:25 ( 14, 43)

* 181P/Shoemaker-Levy 6

It has not been observed yet in this return. It will brighten up to 16.5 mag in January. It locates low in the evening. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  21 13.34  -25 42.0   1.611   1.196    47   17.1  18:21 ( 41, 17)  
Dec. 25  21 39.26  -22 27.0   1.599   1.176    47   16.8  18:25 ( 44, 19)

* 193P/LINEAR-NEAT

Now it is 17.3 mag (Nov. 27, 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)  
Dec. 18  23 36.21    7  4.8   2.079   2.321    91   16.9  18:21 ( 17, 61)  
Dec. 25  23 45.25    8  0.3   2.178   2.339    86   17.0  18:25 ( 28, 60)

* 430P/2021 Q2 ( Scotti )

First return of a new periodic comet which brightened up to 17 mag in 2011. Now it is 17.6 mag (Dec. 3, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 17 mag in good condition until spring. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  13  3.80   -2 10.0   1.585   1.562    70   16.9   5:31 (321, 45)  
Dec. 25  13 21.10   -3 53.9   1.546   1.570    72   16.9   5:35 (326, 45)

* C/2019 T3 ( ATLAS )

Now it is 16.7 mag (Dec. 1, Toshihiko Ikemura, Hirohisa Sato). Fading slowly. It is not observable until April in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  21 35.83   20  5.9   6.527   6.285    71   17.0  18:21 ( 76, 53)  
Dec. 25  21 38.05   19 15.5   6.643   6.301    65   17.1  18:25 ( 81, 47)

* 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)  
Dec. 18  11 58.72  -54  1.3   3.845   3.610    68   17.1   5:31 (354,  0)  
Dec. 25  11 55.26  -54 22.7   3.808   3.657    73   17.1   5:35 (359,  0)

* 422P/2021 L1 ( Christensen )

First return of a new periodic comet which brightened up to 17 mag in 2006. Now it is 17.2 mag (Nov. 23, ATLAS-HKO, Haleakala). It stays 17 mag from 2021 to 2022. In the Southern Hemisphere, it stays observable in good condition for a while. It locates extremely low in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  22 33.62  -41 44.2   3.446   3.111    62   17.1  18:21 ( 18, 10)  
Dec. 25  22 42.72  -39 39.5   3.511   3.108    58   17.1  18:25 ( 23, 11)

* C/2020 S4 ( PanSTARRS )

Now it is 16.7 mag (Nov. 27, Toshihiko Ikemura, Hirohisa Sato). 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)  
Dec. 18   4 30.41    2 40.9   4.152   5.048   152   17.1  22:41 (  0, 58)  
Dec. 25   4 27.19    2 55.3   4.150   5.004   147   17.1  22:11 (  0, 58)

* 230P/LINEAR

Now it is 18.5 mag (Nov. 28, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 16.5-17 mag in winter. In its last apparition in 2015, it brightened up to 13 mag. But actually, it is fainter than this ephemeris recently. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  22 56.36  -22 50.0   1.871   1.811    71   17.1  18:21 ( 19, 30)  
Dec. 25  23  9.67  -21  3.5   1.900   1.778    67   17.1  18:25 ( 24, 30)

* 274P/Tombaugh-Tenagra

Now it is 17.5 mag (Nov. 27, Toshihiko Ikemura, Hirohisa Sato). It is observable at 17 mag from November to March. It is observable in good condition in the Northern Hemisphere, but it locates low in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18   5 45.63   25 44.5   1.598   2.581   177   17.1   0:01 (  0, 81)  
Dec. 25   5 39.46   26 33.4   1.589   2.566   171   17.1  23:23 (  0, 82)

* P/2021 Q5 ( ATLAS )

Bright new periodic comet. It brightened up to 12.7 mag in autumn (Oct. 9, Thomas Lehmann). It stays observable in good condition for a long time. But it is fading rapidly, and it will be fainter than 18 mag in January. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  11 10.71   -9  6.5   1.404   1.764    93   17.2   5:24 (  0, 46)  
Dec. 25  11 15.12  -10 25.1   1.381   1.816    98   17.4   5:01 (  0, 44)

* C/2020 U4 ( PanSTARRS )

Now it is 17.2 mag (Nov. 28, 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)  
Dec. 18   3 32.41   32 30.2   4.542   5.417   149   17.2  21:43 (  0, 88)  
Dec. 25   3 22.41   31 51.7   4.606   5.409   141   17.2  21:06 (  0, 87)

* C/2021 K1 ( ATLAS )

Now it is 16.9 mag (Nov. 27, Toshihiko Ikemura, Hirohisa Sato). It continued brightening even after the perihelion passage. But it will be fading after this, and it will be fainter than 18 mag in January. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18   1  1.93  -11 42.2   2.928   3.292   103   17.3  19:14 (  0, 43)  
Dec. 25   1  5.76  -10 52.6   3.061   3.333    97   17.5  18:50 (  0, 44)

* 28P/Neujmin 1

Now it is 16.3 mag (Dec. 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)  
Dec. 18   4 28.32   41 56.3   2.440   3.362   155   17.3  22:39 (180, 83)  
Dec. 25   4 22.33   41 21.8   2.525   3.416   150   17.4  22:06 (180, 84)

* 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 17.6 mag (Dec. 2, 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)  
Dec. 18   8 51.39   28 55.7   1.375   2.203   137   17.3   3:06 (  0, 84)  
Dec. 25   8 43.05   29 39.5   1.382   2.266   146   17.5   2:30 (  0, 85)

* C/2020 F2 ( ATLAS )

Now it is 17.8 mag (Aug. 4, ATLAS-HKO, Haleakala). It stays observable at 17-18 mag for a long time until 2024. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  14 37.76   -5 44.3   9.532   8.901    47   17.4   5:31 (300, 28)  
Dec. 25  14 38.50   -5 36.9   9.429   8.896    54   17.4   5:35 (307, 33)

* 81P/Wild 2

Now it is 17.8 mag (Nov. 25, ATLAS-HKO, Haleakala). It will brighten up to 11.5 mag in 2022 winter. It stays observable while the comet will be brightening slowly. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18   3  6.29   13  6.2   2.510   3.338   141   17.5  21:17 (  0, 68)  
Dec. 25   3  2.42   12 57.4   2.545   3.302   133   17.4  20:46 (  0, 68)

* 119P/Parker-Hartley

Now it is 16.9 mag (Dec. 1, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 15 mag in 2022 winter. It will be unobservable in February. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  22 53.35  -14 28.3   2.937   2.816    73   17.4  18:21 ( 23, 38)  
Dec. 25  23  0.86  -13 32.2   3.003   2.792    68   17.4  18:25 ( 30, 36)

* C/2018 N2 ( ASASSN )

Now it is 17.3 mag (Dec. 4, Toshihiko Ikemura, Hirohisa Sato). In the Northern Hemisphere, it stays observable for a long time while it is getting fainter slowly. In the Southern Hemisphere, it will never be observable again. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  14 45.49   40 53.6   7.535   7.364    76   17.4   5:31 (246, 49)  
Dec. 25  14 48.10   41  5.2   7.516   7.411    80   17.4   5:35 (247, 55)

* 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 16.6 mag (Nov. 23, 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)  
Dec. 18   1 10.33  -59 53.7   4.736   4.669    80   17.4  19:21 (  0, -5)  
Dec. 25   1  7.14  -58  4.7   4.855   4.732    77   17.5  18:51 (  0, -3)

* C/2021 D2 ( ZTF )

Now it is 17.6 mag (Dec. 11, Toshihiko Ikemura, Hirohisa Sato). It was expected to brighten up to 15.5 mag in winter. But actually, it is fading even before the perihelion passage. 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)  
Dec. 18  16 18.55   66 31.8   2.796   2.985    91   17.4   5:31 (209, 38)  
Dec. 25  16 24.65   68 19.4   2.742   2.975    93   17.4   5:35 (207, 40)

* (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)  
Dec. 18   2  7.64   29 53.7   1.306   2.096   131   17.5  20:18 (  0, 85)  
Dec. 25   1 57.71   27 42.8   1.349   2.055   122   17.6  19:41 (  0, 83)

* 241P/LINEAR

Now it is 17.1 mag (Nov. 28, Toshihiko Ikemura, Hirohisa Sato). It will be fainter than 18 mag in January. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18   9 17.21   20 59.2   1.592   2.353   130   17.6   3:32 (  0, 76)  
Dec. 25   9 13.29   20 13.0   1.563   2.389   138   17.6   3:00 (  0, 75)

* 99P/Kowal 1

Now it is 17.2 mag (Dec. 10, Toshihiko Ikemura, Hirohisa Sato). It will be observable at 17 mag in good condition in spring. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  13 21.54   -7 17.0   5.067   4.726    64   17.7   5:31 (319, 38)  
Dec. 25  13 26.08   -7 45.7   4.964   4.724    70   17.7   5:35 (327, 41)

* 106P/Schuster

It brightened up to 15.2 mag in summer (Aug. 25, Ken-ichi Kadota). Now it is fading. It has already faded down to 17.5 mag (Nov. 28, Toshihiko Ikemura, Hirohisa Sato). 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)  
Dec. 18   9 23.76   45 47.8   1.186   1.971   130   17.7   3:38 (180, 79)  
Dec. 25   9 21.50   47 28.0   1.189   2.014   135   18.0   3:09 (180, 78)

* C/2021 U5 ( Catalina )

Now it is 17.9 mag (Nov. 27, ATLAS-HKO, Haleakala). It is observable at 17 mag in good condition from winter to spring. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18  10  1.02  -27 26.8   2.039   2.407    99   17.9   4:15 (  0, 27)  
Dec. 25  10  6.90  -28  1.1   1.961   2.394   103   17.8   3:53 (  0, 27)

* C/2021 T2 ( Fuls )

Now it is 18.5 mag (Nov. 27, Catalina Sky Survey). It is expected to brighten up to 13.5 mag from June to July. It is observable only in the Southern Hemisphere at the high light. In the Northern Hemisphere, it is observable only until March when it brightens up to 16.5 mag. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18   1 33.91   23 31.1   2.031   2.701   123   17.9  19:45 (  0, 78)  
Dec. 25   1 25.03   20  8.4   2.070   2.624   113   17.8  19:09 (  0, 75)

* C/2019 K7 ( Smith )

Now it is 17.5 mag (Nov. 13, D. Buczynski). 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)  
Dec. 18  16 48.37   48 50.8   6.432   6.219    73   17.8   5:31 (229, 30)  
Dec. 25  16 52.12   49 26.2   6.437   6.256    75   17.9   5:35 (230, 35)

* P/1997 B1 ( Kobayashi )

First return of a new periodic comet which brightened up to 16.5 mag in 1997. It has not been observed yet in this return. It is expected to be observable at 17 mag in good condition from January to March. But actually, it is not detected, fainter than 21.5 mag (Nov. 29, Takaaki Oribe). 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18   8 57.33   29 27.5   1.490   2.304   136   18.0   3:12 (  0, 84)  
Dec. 25   8 58.35   29 11.0   1.411   2.273   142   17.9   2:45 (  0, 84)

* P/2020 V4 ( Rankin )

Now it is 17.7 mag (Dec. 2, Toshihiko Ikemura, Hirohisa Sato). It is observable at 18 mag in good condition in winter. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18   8  4.75    3  6.7   4.413   5.207   140   17.9   2:19 (  0, 58)  
Dec. 25   8  2.49    3  1.0   4.362   5.212   146   17.9   1:49 (  0, 58)

* P/2021 U3 ( Attard-Maury )

Now it is 17.6 mag (Nov. 27, Toshihiko Ikemura, Hirohisa Sato). It is observable at 17-18 mag in good condition from November to December. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 18   4 10.21   21 33.3   1.003   1.953   158   17.9  22:20 (  0, 77)  
Dec. 25   3 48.84   25 57.8   1.070   1.970   147   18.1  21:31 (  0, 81)

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