Weekly Information about Bright Comets (2021 Dec. 25: North)

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Updated on December 26, 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 3 mag in outburst on Dec. 14. Now it is bright as 3.8 mag (Dec. 25, Marco Goiato). 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. 25  21  5.35  -33 23.5   0.566   0.648    38    5.4  18:25 ( 42,  5)  
Jan.  1  21 33.91  -35 25.8   0.832   0.617    38    6.0  18:29 ( 42,  3)  

* 67P/Churyumov-Gerasimenko

Now it is very bright as 9.1 mag (Dec. 26, 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. 25   9  2.04   28  9.1   0.461   1.377   141    9.0   2:49 (  0, 83)  
Jan.  1   8 59.04   28 34.4   0.481   1.418   149    9.2   2:19 (  0, 83)  

* 19P/Borrelly

Now it is bright as 9.6 mag (Dec. 25, 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. 25   0  4.66  -23  3.7   1.179   1.386    79    9.4  18:25 (  9, 32)  
Jan.  1   0 17.96  -18 12.3   1.185   1.361    77    9.2  18:29 ( 16, 36)  

* C/2019 L3 ( ATLAS )

Now it is 9.7 mag (Dec. 26, Marco Goiato). 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. 25   7 19.90   34  8.9   2.609   3.557   161    9.8   1:08 (  0, 89)  
Jan.  1   7 12.66   32 56.3   2.587   3.555   168    9.8   0:33 (  0, 88)  

* C/2017 K2 ( PanSTARRS )

Now it is bright as 11.9 mag (Dec. 2, Ken-ichi Kadota). 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. 25  17 51.93   13 50.7   5.197   4.458    37   11.1   5:35 (258,  7)  
Jan.  1  17 57.59   13 17.3   5.127   4.396    38   11.0   5:37 (262, 12)  

* 104P/Kowal 2

Brightened very rapidly. Now it is very bright as 11.0 mag (Dec. 20, Michael Jager). It is observable at 11 mag in good condition from December to February.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 25  23 39.82   -6 39.9   0.699   1.099    79   11.2  18:25 ( 22, 46)  
Jan.  1   0  4.82   -5  9.0   0.682   1.083    78   11.0  18:29 ( 25, 47)  

* 4P/Faye

Now it is bright as 11.5 mag (Dec. 18, Seiichi Yoshida). 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. 25   6 39.97    7  9.3   0.979   1.939   162   11.5   0:27 (  0, 62)  
Jan.  1   6 34.23    7 25.2   1.012   1.976   164   11.7  23:49 (  0, 62)  

* 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.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 25  23 38.55  -21 24.0   1.730   1.739    74   11.6  18:25 ( 17, 32)  
Jan.  1  23 56.32  -19 27.3   1.827   1.785    71   12.1  18:29 ( 21, 33)  

* 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. 25  16 30.66  -18 54.7   2.610   1.761    24   12.5   5:35 (297,  4)  
Jan.  1  16 51.28  -19 39.0   2.553   1.730    26   12.3   5:37 (299,  5)  

* C/2019 T4 ( ATLAS )

Now it is 13.4 mag (Dec. 14, Chris Wyatt). It will brighten up to 11.5 mag in spring. 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. 25  11 57.46  -29 14.5   4.489   4.461    82   12.5   5:35 (358, 26)  
Jan.  1  12  0.91  -29 28.6   4.374   4.443    87   12.4   5:20 (  0, 25)  

* 9P/Tempel 1

Now it is 15.2 mag (Dec. 1, Ken-ichi Kadota). It will brighten up to 12 mag from winter to spring. 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. 25  15 17.69  -12 50.0   2.269   1.687    42   13.1   5:35 (304, 21)  
Jan.  1  15 37.51  -14 23.6   2.206   1.662    44   13.0   5:37 (307, 22)  

* 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. 25   4 24.81   31 16.2   5.038   5.942   154   13.3  22:08 (  0, 86)  
Jan.  1   4 21.85   31  0.9   5.092   5.944   147   13.3  21:38 (  0, 86)  

* 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 soon. 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. 25  21 17.49  -14 38.3   2.404   1.832    44   13.4  18:25 ( 53, 21)  
Jan.  1  21 35.68  -13 19.3   2.470   1.854    41   13.7  18:29 ( 57, 20)  

* 8P/Tuttle

It brightened very rapidly, and brightened up to 8.9 mag (Sept. 11, Chris Wyatt). Now it is fading. It has already faded down to 15.7 mag (Dec. 7, E. Cortes, N. Paul, B. Lutkenhoner). 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. 25  15 37.44  -52 42.0   2.578   1.955    41   13.7   5:35 (329,-11)  
Jan.  1  15 57.58  -53 15.7   2.622   2.027    43   14.0   5:37 (330,-10)  

* 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. 25  19 24.69  -33 18.7   3.736   2.821    18   13.7  18:25 ( 56,-10)  
Jan.  1  19 39.50  -33 19.9   3.807   2.874    15   13.9  18:29 ( 58,-13)  

* 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 14.2 mag (Dec. 10, Ken-ichi Kadota). 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. 25  14 27.83    3 16.7   4.457   4.073    61   14.0   5:35 (302, 41)  
Jan.  1  14 28.64    4 18.4   4.374   4.109    68   14.0   5:37 (308, 47)  

* 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. 25  12 48.38  -50 22.4   3.824   3.553    66   14.4   5:35 (350,  4)  
Jan.  1  12 45.78  -52 52.6   3.706   3.522    71   14.3   5:37 (356,  2)  

* 132P/Helin-Roman-Alu 2

It brightened up to 13.1 mag in autumn (Oct. 28, Toshihiko Ikemura, Hirohisa Sato). Now it is fading. But it is bright as 14.5 mag still now (Dec. 5, Thomas Lehmann). It stays observable in good condition for a long time. But it will be fainter than 18 mag in March.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 25   1 26.15    1 38.7   1.175   1.742   107   14.7  19:11 (  0, 57)  
Jan.  1   1 38.44    2 57.9   1.246   1.759   103   14.9  18:56 (  0, 58)  

* 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 locates extremely low from January to February. Then it stays unobservable until 2023 summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 25  13  5.86   40  2.8   5.369   5.551    95   15.1   5:35 (247, 74)  
Jan.  1  13  6.72   41 21.7   5.221   5.495   101   15.0   5:37 (233, 79)  

* 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. 25  10  8.02   16 28.0   1.904   2.594   124   15.2   3:55 (  0, 71)  
Jan.  1  10  9.18   16 30.8   1.810   2.571   131   15.0   3:28 (  0, 71)  

* 117P/Helin-Roman-Alu 1

Now it is 15.8 mag (Oct. 4, Thomas Lehmann). Appearing in the morning. It will brighten up to 13 mag in summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 25  16 31.12  -22 18.2   4.063   3.186    23   15.1   5:35 (299,  2)  
Jan.  1  16 42.21  -22 50.0   4.010   3.177    28   15.1   5:37 (302,  5)  

* 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. 25  19 10.37   -5 59.6   3.624   2.738    22   15.2  18:25 ( 81,  3)  
Jan.  1  19 16.36   -7 13.9   3.598   2.677    17   15.1  18:29 ( 83, -3)  

* C/2020 R7 ( ATLAS )

Now it is 16.0 mag (Dec. 5, 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. 25  22 21.36  -66 27.1   4.363   3.924    57   15.1  18:25 ( 14,-15)  
Jan.  1  22 19.20  -64 56.2   4.375   3.882    54   15.1  18:29 ( 18,-15)  

* C/2019 U5 ( PanSTARRS )

Now it is 15.8 mag (Dec. 16, D. Buczynski). 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)  
Dec. 25  16 33.32   30 54.6   5.825   5.391    59   15.2   5:35 (252, 31)  
Jan.  1  16 35.82   31  0.7   5.736   5.349    62   15.1   5:37 (255, 37)  

* 110P/Hartley 3

It brightened rapidly. Now it is 15.1 mag (Dec. 5, Hiroshi Abe). 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. 25   8 36.89   16 15.6   1.617   2.491   145   15.1   2:24 (  0, 71)  
Jan.  1   8 32.74   15 48.0   1.580   2.499   153   15.1   1:52 (  0, 71)  

* 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. 25  15 43.91  -20 59.7   3.074   2.332    34   15.1   5:35 (306, 11)  
Jan.  1  15 53.50  -22  5.4   3.101   2.423    39   15.3   5:37 (310, 13)  

* 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. 25  16 58.93  -28 16.6   5.938   5.009    17   15.4   5:35 (300, -7)  
Jan.  1  17  2.60  -29  6.2   5.899   5.014    23   15.4   5:37 (304, -3)  

* 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. 25  22  8.93    3 59.7   2.649   2.379    63   15.9  18:25 ( 57, 43)  
Jan.  1  22 14.72    3  9.4   2.646   2.275    57   15.7  18:29 ( 62, 38)  

* C/2020 M5 ( ATLAS )

Now it is 15.3 mag (Dec. 5, Hiroshi Abe). 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. 25  13 18.34   14 57.6   3.249   3.255    81   15.7   5:35 (309, 61)  
Jan.  1  13 16.17   14 18.8   3.157   3.282    88   15.7   5:37 (324, 65)  

* C/2020 F5 ( MASTER )

Now it is 15.4 mag (Dec. 6, Thomas Lehmann). 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. 25  22 35.58  -16 20.5   5.272   4.881    61   15.8  18:25 ( 35, 31)  
Jan.  1  22 39.20  -15 12.7   5.394   4.907    55   15.9  18:29 ( 43, 28)  

* C/2020 K1 ( PanSTARRS )

Now it is 16.0 mag (Dec. 8, A. Diepvens). It is expected to brighten up to 11 mag in 2023. In the Northern Hemisphere, it stays observable in good condition until 2022 November. But it becomes unobservable after that. 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. 25  18 11.77   19 10.6   6.204   5.520    42   15.9   5:35 (251,  6)  
Jan.  1  18 16.65   18 41.5   6.159   5.472    42   15.8   5:37 (255, 11)  

* 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. 25   6 22.06    2 38.6   3.004   3.938   159   15.8   0:09 (  0, 58)  
Jan.  1   6 17.77    3 19.9   3.004   3.939   159   15.8  23:33 (  0, 58)  

* 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. 25  16 13.57   18 56.1   2.990   2.498    51   15.8   5:35 (267, 30)  
Jan.  1  16 13.51   19 53.3   2.934   2.529    56   15.9   5:37 (270, 36)  

* C/2019 F1 ( ATLAS-Africano )

Now it is 16.3 mag (Nov. 30, E. Cortes, N. Paul, B. Lutkenhoner). 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. 25  23  0.48  -56 24.7   4.352   3.964    60   15.9  18:25 ( 14, -4)  
Jan.  1  23 10.14  -54 24.5   4.426   3.990    57   15.9  18:29 ( 17, -3)  

* 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 soon.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 25  20 54.72  -29  7.7   4.014   3.275    36   15.9  18:25 ( 47,  7)  
Jan.  1  21  5.50  -28 25.1   4.083   3.291    32   16.0  18:29 ( 51,  4)  

* 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. 25   2  3.39   11 23.5   3.222   3.805   119   15.9  19:47 (  0, 66)  
Jan.  1   2  4.91   11 15.1   3.318   3.808   112   16.0  19:21 (  0, 66)  

* 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. 25  11 29.12    6 57.8   1.595   2.053   102   16.1   5:15 (  0, 62)  
Jan.  1  11 36.73    6 44.6   1.535   2.065   108   16.0   4:55 (  0, 62)  

* C/2020 U5 ( PanSTARRS )

Now it is 16.6 mag (Dec. 10, ATLAS-MLO, Mauna Loa). 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. 25  10 58.99   85  0.6   3.395   3.912   114   16.1   4:46 (180, 40)  
Jan.  1  11 44.09   87 42.2   3.396   3.896   113   16.1   5:02 (180, 37)  

* 108P/Ciffreo

It brightened even after the perihelion passage. Now it is very bright as 13.5 mag (Dec. 6, Katsumi Yoshimoto). It is observable in excellent condition in the Northern Hemisphere. It locates low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 25   7 10.43   39 32.3   0.999   1.952   159   16.3   0:58 (180, 86)  
Jan.  1   7  3.13   40 16.2   1.027   1.986   162   16.5   0:23 (180, 85)  

* 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. 25  15 37.51    9  5.4   5.321   4.751    50   16.3   5:35 (282, 32)  
Jan.  1  15 43.33   10  1.1   5.250   4.759    55   16.3   5:37 (286, 37)  

* C/2021 P4 ( ATLAS )

Now it is 16.0 mag (Dec. 13, R. Naves, M. Campas). 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 October.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 25  22 34.30   53 22.2   2.994   3.233    95   16.5  18:25 (140, 61)  
Jan.  1  22 38.38   52 32.9   2.981   3.156    91   16.4  18:29 (135, 58)  

* 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. 25   4 32.17  -14 37.8   3.141   3.895   134   16.7  22:15 (  0, 40)  
Jan.  1   4 28.59  -13 47.6   3.204   3.913   130   16.7  21:44 (  0, 41)  

* 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. 25  21 39.26  -22 27.0   1.599   1.176    47   16.8  18:25 ( 44, 19)  
Jan.  1  22  4.91  -18 52.2   1.592   1.164    46   16.7  18:29 ( 47, 21)  

* 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. 25   8 37.29  -42 46.5   4.985   5.341   106   16.7   2:24 (  0, 12)  
Jan.  1   8 28.83  -44  0.5   4.945   5.344   108   16.7   1:48 (  0, 11)  

* 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. 25  12 23.90   -2 22.0   1.720   1.931    86   16.8   5:35 (346, 52)  
Jan.  1  12 32.38   -3 57.1   1.671   1.957    91   16.8   5:37 (355, 51)  

* 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. 25   3 49.57    6 39.7   1.972   2.810   141   16.8  21:33 (  0, 62)  
Jan.  1   3 46.32    7 12.9   2.074   2.850   134   17.0  21:02 (  0, 62)  

* 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. 25  18 45.04   47 26.3   9.249   8.980    71   16.8  18:25 (131, 26)  
Jan.  1  18 48.80   47 44.3   9.263   8.988    70   16.8  18:29 (134, 22)  

* 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 (Dec. 13, Catalina Sky Survey). 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. 25  13 21.10   -3 53.9   1.546   1.570    72   16.9   5:35 (326, 45)  
Jan.  1  13 37.87   -5 32.1   1.507   1.581    75   16.9   5:37 (331, 45)  

* 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. 25  23 58.37  -11 10.7   2.331   2.403    82   17.0  18:25 ( 14, 43)  
Jan.  1   0  7.83  -10  2.2   2.428   2.418    77   17.1  18:29 ( 22, 43)  

* 193P/LINEAR-NEAT

Now it is 17.6 mag (Dec. 4, Ken-ichi Kadota). 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. 25  23 45.25    8  0.3   2.178   2.339    86   17.0  18:25 ( 28, 60)  
Jan.  1  23 54.82    8 58.7   2.279   2.358    82   17.1  18:29 ( 39, 59)  

* 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. 25  23  9.67  -21  3.5   1.900   1.778    67   17.1  18:25 ( 24, 30)  
Jan.  1  23 23.66  -19  9.8   1.927   1.748    64   17.0  18:29 ( 30, 30)  

* 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 until spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 25   4 27.19    2 55.3   4.150   5.004   147   17.1  22:11 (  0, 58)  
Jan.  1   4 24.30    3 14.0   4.160   4.961   140   17.1  21:40 (  0, 58)  

* 274P/Tombaugh-Tenagra

Now it is 17.5 mag (Dec. 13, ATLAS-MLO, Mauna Loa). 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. 25   5 39.46   26 33.4   1.589   2.566   171   17.1  23:23 (  0, 82)  
Jan.  1   5 33.50   27 19.9   1.594   2.552   163   17.1  22:49 (  0, 82)  

* 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. 25  11 55.26  -54 22.7   3.808   3.657    73   17.1   5:35 (359,  0)  
Jan.  1  11 50.27  -54 40.1   3.767   3.704    78   17.1   5:09 (  0,  0)  

* 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. 25  21 38.05   19 15.5   6.643   6.301    65   17.1  18:25 ( 81, 47)  
Jan.  1  21 40.55   18 30.9   6.755   6.318    59   17.2  18:29 ( 85, 41)  

* 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. 25  22 42.72  -39 39.5   3.511   3.108    58   17.1  18:25 ( 23, 11)  
Jan.  1  22 51.97  -37 35.5   3.575   3.106    54   17.2  18:29 ( 28, 11)  

* 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. 25   3 22.41   31 51.7   4.606   5.409   141   17.2  21:06 (  0, 87)  
Jan.  1   3 13.39   31 11.6   4.686   5.402   132   17.2  20:29 (  0, 86)  

* 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. 25  14 38.50   -5 36.9   9.429   8.896    54   17.4   5:35 (307, 33)  
Jan.  1  14 38.99   -5 27.4   9.316   8.890    61   17.3   5:37 (314, 38)  

* 81P/Wild 2

Now it is 17.4 mag (Dec. 12, J.-G. Bosch, F. Kugel, J. Nicolas). 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. 25   3  2.42   12 57.4   2.545   3.302   133   17.4  20:46 (  0, 68)  
Jan.  1   2 59.57   12 53.5   2.590   3.265   125   17.4  20:16 (  0, 68)  

* 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. 25  11 15.12  -10 25.1   1.381   1.816    98   17.4   5:01 (  0, 44)  
Jan.  1  11 17.78  -11 32.4   1.358   1.869   104   17.6   4:37 (  0, 43)  

* 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. 25  23  0.86  -13 32.2   3.003   2.792    68   17.4  18:25 ( 30, 36)  
Jan.  1  23  8.95  -12 32.5   3.066   2.768    63   17.4  18:29 ( 37, 34)  

* 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. 25  16 24.65   68 19.4   2.742   2.975    93   17.4   5:35 (207, 40)  
Jan.  1  16 30.66   70 27.1   2.690   2.966    96   17.4   5:37 (204, 42)  

* 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. 25  14 48.10   41  5.2   7.516   7.411    80   17.4   5:35 (247, 55)  
Jan.  1  14 50.31   41 21.3   7.494   7.459    84   17.5   5:37 (247, 60)  

* 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. 25   4 22.33   41 21.8   2.525   3.416   150   17.4  22:06 (180, 84)  
Jan.  1   4 17.57   40 44.3   2.622   3.470   144   17.6  21:34 (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. 25   8 43.05   29 39.5   1.382   2.266   146   17.5   2:30 (  0, 85)  
Jan.  1   8 33.29   30 19.8   1.400   2.327   154   17.6   1:53 (  0, 85)  

* 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. 25   1  5.76  -10 52.6   3.061   3.333    97   17.5  18:50 (  0, 44)  
Jan.  1   1 10.19  -10  0.2   3.196   3.374    91   17.7  18:29 (  1, 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 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. 25   1  7.14  -58  4.7   4.855   4.732    77   17.5  18:51 (  0, -3)  
Jan.  1   1  5.49  -56 16.7   4.975   4.794    73   17.6  18:29 (  1, -1)  

* 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. 25  13 26.08   -7 45.7   4.964   4.724    70   17.7   5:35 (327, 41)  
Jan.  1  13 30.21   -8 11.8   4.856   4.722    76   17.6   5:37 (335, 44)  

* (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. 25   1 57.71   27 42.8   1.349   2.055   122   17.6  19:41 (  0, 83)  
Jan.  1   1 50.78   25 44.1   1.400   2.011   113   17.7  19:07 (  0, 81)  

* 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. 25   9 13.29   20 13.0   1.563   2.389   138   17.6   3:00 (  0, 75)  
Jan.  1   9  7.86   19 29.5   1.545   2.426   146   17.7   2:27 (  0, 74)  

* C/2021 U5 ( Catalina )

Now it is 17.2 mag (Dec. 15, ATLAS-MLO, Mauna Loa). 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. 25  10  6.90  -28  1.1   1.961   2.394   103   17.8   3:53 (  0, 27)  
Jan.  1  10 11.81  -28 22.7   1.884   2.384   108   17.6   3:31 (  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. 25   1 25.03   20  8.4   2.070   2.624   113   17.8  19:09 (  0, 75)  
Jan.  1   1 18.28   16 59.4   2.122   2.546   104   17.7  18:35 (  0, 72)  

* 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. 25   8 58.35   29 11.0   1.411   2.273   142   17.9   2:45 (  0, 84)  
Jan.  1   8 57.85   28 52.9   1.340   2.244   149   17.7   2:17 (  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. 25   8  2.49    3  1.0   4.362   5.212   146   17.9   1:49 (  0, 58)  
Jan.  1   7 59.84    2 59.4   4.323   5.218   152   17.9   1:19 (  0, 58)  

* 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. 25  16 52.12   49 26.2   6.437   6.256    75   17.9   5:35 (230, 35)  
Jan.  1  16 55.71   50  8.4   6.439   6.292    77   17.9   5:37 (230, 39)  

* C/2021 G2 ( ATLAS )

Now it is 17.1 mag (Nov. 28, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 14 mag from 2024 to 2025.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 25   7 32.72  -31 30.8   8.156   8.716   121   18.0   1:20 (  0, 23)  
Jan.  1   7 30.23  -31 44.4   8.088   8.678   124   17.9   0:50 (  0, 23)  

* 2021 WT6

Peculiar asteroid moving along a cometary orbit. It is observable at 17.5 mag in good condition in January.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 25   7 51.11   -7  6.1   1.176   2.039   141   18.3   1:39 (  0, 48)  
Jan.  1   7 14.99   -3 38.5   1.077   2.000   152   17.9   0:36 (  0, 51)  

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