Weekly Information about Bright Comets (2021 Dec. 4: North)

Japanese version
Home page
Updated on December 8, 2021
Last week South Next week

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.

---------------------------------------------------------------------

* C/2021 A1 ( Leonard )

Now it is very bright as 5.8 mag (Dec. 5, Charles S. Morris). 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 will be getting lower rapidly after this, but it stays observable until the end of 2021. In the Southern Hemisphere, it is observable in the low sky from mid December to mid January.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec.  4  13 51.91   27 23.6   0.419   0.888    64    6.1   5:22 (264, 44)  
Dec. 11  16 18.59    7  7.5   0.242   0.792    32    4.4   5:27 (268, 11)  

* 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.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec.  4   8 49.94   27  6.8   0.429   1.275   123    8.8   3:59 (  0, 82)  
Dec. 11   8 57.91   27 22.6   0.437   1.305   129    8.9   3:40 (  0, 82)  

* 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.  4  23 30.38  -36 21.0   1.176   1.485    86   10.1  18:38 (  0, 19)  
Dec. 11  23 40.73  -32  9.9   1.175   1.448    83    9.9  18:21 (  0, 23)  

* C/2019 L3 ( ATLAS )

Now it is 9.9 mag (Dec. 4, 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.  4   7 38.20   37  9.2   2.766   3.570   139   10.0   2:48 (180, 88)  
Dec. 11   7 32.94   36 15.2   2.700   3.565   146    9.9   2:16 (180, 89)  

* 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.  4  22 39.28  -26 51.8   1.459   1.610    79   10.5  18:18 (  8, 28)  
Dec. 11  23  0.14  -25  8.5   1.545   1.651    78   10.8  18:19 ( 10, 29)  

* 4P/Faye

Now it is bright as 11.5 mag (Dec. 4, 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.  4   6 54.86    7 36.1   0.942   1.836   144   10.9   2:05 (  0, 63)  
Dec. 11   6 50.82    7 14.2   0.944   1.869   151   11.1   1:33 (  0, 62)  

* 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.  4  17 35.43   15 58.1   5.350   4.644    40   11.3  18:18 (100, 14)  
Dec. 11  17 40.81   15 11.0   5.308   4.582    38   11.2  18:19 (102,  9)  

* 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.  4  14 29.83  -49 55.7   2.409   1.738    37   12.3   5:22 (324,-12)  
Dec. 11  14 53.47  -51  4.4   2.471   1.810    38   12.8   5:27 (326,-12)  

* C/2019 T4 ( ATLAS )

Now it is 13.3 mag (Nov. 5, Hiroshi Abe). 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. It is getting observable also in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec.  4  11 43.83  -28 11.7   4.820   4.517    66   12.7   5:22 (338, 23)  
Dec. 11  11 48.88  -28 35.4   4.713   4.498    71   12.6   5:27 (345, 25)  

* 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). It stays observable in the evening sky for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec.  4  20 20.71  -18  0.5   2.213   1.775    51   12.7  18:18 ( 44, 24)  
Dec. 11  20 39.98  -16 59.8   2.275   1.792    49   12.9  18:19 ( 47, 23)  

* 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)  
Dec.  4  15 32.64  -15 58.5   2.782   1.864    17   13.2   5:22 (289, -1)  
Dec. 11  15 51.32  -17  3.5   2.725   1.828    19   13.0   5:27 (292,  1)  

* 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.  4  22 38.61   -9 36.2   0.743   1.191    85   13.4  18:18 ( 11, 45)  
Dec. 11  22 56.71   -8 53.2   0.731   1.154    83   13.1  18:19 ( 15, 45)  

* 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 13.4 mag (Oct. 25, Chris Wyatt). It is not observable already in the Northern Hemisphere. It will be unobservable soon also in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec.  4  18 38.78  -32 43.2   3.496   2.667    28   13.1  18:18 ( 51, -3)  
Dec. 11  18 54.29  -33  0.9   3.580   2.717    24   13.3  18:19 ( 53, -5)  

* 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.  4   4 35.66   31 54.7   4.962   5.936   170   13.3  23:42 (  0, 87)  
Dec. 11   4 31.83   31 43.5   4.973   5.938   167   13.3  23:10 (  0, 87)  

* 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.  4  14 21.57   -7 46.8   2.468   1.775    36   13.7   5:22 (293, 18)  
Dec. 11  14 39.73   -9 30.7   2.401   1.744    38   13.5   5:27 (297, 19)  

* 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.  4  14 22.48    0 50.6   4.663   3.970    40   14.0   5:22 (286, 23)  
Dec. 11  14 24.68    1 33.4   4.603   4.004    47   14.0   5:27 (291, 29)  

* 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.  4   0 53.89   -1 44.6   0.985   1.704   119   14.2  20:01 (  0, 53)  
Dec. 11   1  3.74   -0 44.5   1.044   1.714   115   14.4  19:44 (  0, 54)  

* 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.  4  15 11.15  -17  7.9   2.939   2.056    21   14.5   5:22 (293,  2)  
Dec. 11  15 22.73  -18 31.7   2.993   2.149    25   14.7   5:27 (297,  5)  

* C/2020 Y2 ( ATLAS )

Now it is 16.1 mag (Nov. 28, G. Duszanowicz). 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.  4  12 48.25  -43 35.1   4.171   3.650    52   14.7   5:22 (333,  4)  
Dec. 11  12 49.30  -45 43.4   4.058   3.617    56   14.6   5:27 (339,  4)  

* 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.  4   8 41.22   17 58.4   1.785   2.473   123   15.2   3:51 (  0, 73)  
Dec. 11   8 41.22   17 20.9   1.721   2.478   130   15.2   3:23 (  0, 72)  

* 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.  4  15 58.05  -20 26.9   4.183   3.218    10   15.2   5:22 (289, -9)  
Dec. 11  16  9.01  -21  6.5   4.150   3.207    14   15.2   5:27 (292, -5)  

* 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 in 2022.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec.  4  22 42.37  -71 12.1   4.299   4.054    69   15.2  18:18 (  2,-16)  
Dec. 11  22 32.25  -69 36.8   4.324   4.011    65   15.2  18:19 (  6,-15)  

* 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.  4  12 59.91   36 55.6   5.828   5.718    78   15.4   5:22 (255, 56)  
Dec. 11  13  2.37   37 49.8   5.674   5.663    84   15.3   5:27 (254, 62)  

* C/2019 U5 ( PanSTARRS )

Now it is 15.3 mag (Oct. 29, 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, 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.  4  16 24.95   31 15.4   6.045   5.517    53   15.4   5:22 (242, 15)  
Dec. 11  16 27.82   31  2.0   5.980   5.475    55   15.3   5:27 (246, 20)  

* 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.  4  18 54.34   -1 52.9   3.633   2.923    38   15.5  18:18 ( 73, 20)  
Dec. 11  18 59.31   -3 19.7   3.640   2.861    32   15.4  18:19 ( 75, 14)  

* 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.  4  16 47.58  -25 51.0   5.981   4.999     3   15.4  18:18 ( 71,-19)  
Dec. 11  16 51.37  -26 39.1   5.980   5.001     5   15.4   5:27 (292,-16)  

* 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.  4  22 27.10  -19 46.1   4.884   4.805    79   15.6  18:18 ( 12, 34)  
Dec. 11  22 29.47  -18 37.3   5.016   4.830    73   15.6  18:19 ( 20, 34)  

* 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.  4  16 11.22   17 13.2   3.087   2.417    40   15.6   5:22 (256, 10)  
Dec. 11  16 12.29   17 36.8   3.067   2.442    43   15.7   5:27 (260, 17)  

* 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.  4   9 57.67   16 55.0   2.219   2.665   106   15.9   5:07 (  0, 72)  
Dec. 11  10  2.16   16 40.5   2.109   2.641   112   15.7   4:44 (  0, 72)  

* 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.  4   7 25.25   36  1.7   0.978   1.856   141   15.7   2:35 (180, 89)  
Dec. 11   7 22.11   37 21.4   0.975   1.887   148   15.8   2:05 (180, 88)  

* C/2019 F1 ( ATLAS-Africano )

Now it is 15 mag (Oct. 31, Giuseppe Pappa). 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)  
Dec.  4  22 30.66  -62 32.7   4.127   3.889    69   15.7  18:18 (  5, -8)  
Dec. 11  22 40.74  -60 29.3   4.202   3.913    66   15.7  18:19 (  7, -6)  

* 246P/NEAT

Now it is 15.2 mag (Nov. 13, 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.  4  20 22.75  -31  3.8   3.773   3.227    49   15.7  18:18 ( 36, 13)  
Dec. 11  20 33.30  -30 27.1   3.859   3.243    45   15.8  18:19 ( 40, 11)  

* C/2021 D2 ( ZTF )

Now it is 17.6 mag (Nov. 5, Toshihiko Ikemura, Hirohisa Sato). It is expected to 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. It is fainter than this ephemeris recently.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec.  4  16  6.64   63 55.0   2.908   3.011    86   15.8   5:22 (211, 32)  
Dec. 11  16 12.52   65  3.9   2.852   2.997    88   15.7   5:27 (211, 35)  

* 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.  4  13 19.20   17 22.6   3.501   3.182    63   15.8   5:22 (281, 45)  
Dec. 11  13 19.74   16 29.3   3.423   3.205    69   15.8   5:27 (288, 51)  

* 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.  4   2  3.63   12 21.1   2.979   3.799   141   15.8  21:10 (  0, 67)  
Dec. 11   2  2.75   11 56.6   3.051   3.800   133   15.9  20:42 (  0, 67)  

* 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 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)  
Dec.  4   6 33.81    1 12.5   3.087   3.938   145   15.9   1:44 (  0, 56)  
Dec. 11   6 30.26    1 34.6   3.046   3.938   151   15.9   1:13 (  0, 57)  

* 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.  4  17 57.48   21  6.3   6.289   5.665    47   16.0  18:18 (101, 21)  
Dec. 11  18  2.15   20 23.0   6.268   5.617    45   16.0  18:19 (104, 16)  

* 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 16.0 mag (Dec. 2, 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.  4   4  6.49    5 31.0   1.736   2.688   161   16.1  23:12 (  0, 61)  
Dec. 11   3 59.78    5 47.9   1.802   2.729   155   16.3  22:38 (  0, 61)  

* 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.  4  10 14.22   76 26.9   3.476   3.968   113   16.2   5:22 (180, 49)  
Dec. 11  10 25.75   79 19.2   3.435   3.949   114   16.1   5:08 (180, 46)  

* 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.  4  21 57.34    7 17.8   2.621   2.682    82   16.4  18:18 ( 36, 58)  
Dec. 11  22  0.18    6  3.6   2.635   2.583    76   16.2  18:19 ( 44, 53)  

* 70P/Kojima

Now it is 16.2 mag (Dec. 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)  
Dec.  4  11  0.09    8 26.1   1.789   2.025    88   16.3   5:22 (335, 61)  
Dec. 11  11 10.69    7 49.6   1.723   2.033    93   16.2   5:27 (347, 62)  

* 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.  4  15 19.09    6 51.9   5.500   4.730    35   16.3   5:22 (272, 15)  
Dec. 11  15 25.36    7 31.1   5.448   4.736    40   16.3   5:27 (275, 21)  

* 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.  4  23 32.93  -14 13.7   2.045   2.365    96   16.5  18:40 (  0, 41)  
Dec. 11  23 40.84  -13 17.3   2.139   2.377    91   16.7  18:21 (  0, 42)  

* 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.  4   4 45.88  -16 15.6   3.019   3.840   141   16.5  23:51 (  0, 39)  
Dec. 11   4 40.97  -15 52.8   3.047   3.858   140   16.6  23:19 (  0, 39)  

* 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.  4  23 20.03    5 24.2   1.884   2.288   101   16.6  18:27 (  0, 61)  
Dec. 11  23 27.77    6 12.6   1.980   2.304    96   16.7  18:19 (  6, 61)  

* 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.  4  11 52.50    2 50.2   1.865   1.864    74   16.7   5:22 (319, 50)  
Dec. 11  12  3.88    1  2.2   1.817   1.885    78   16.7   5:27 (328, 51)  

* 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 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)  
Dec.  4  22 31.34   56 33.6   3.042   3.462   107   16.8  18:18 (166, 67)  
Dec. 11  22 30.63   55 24.1   3.023   3.386   103   16.7  18:19 (155, 66)  

* P/2021 Q5 ( ATLAS )

Now it is 15.6 mag (Nov. 17, Thomas Lehmann). It stays observable in good condition for a long time. It will be fading rapidly 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.  4  10 57.05   -6  0.1   1.445   1.662    84   16.7   5:22 (344, 48)  
Dec. 11  11  4.66   -7 37.9   1.426   1.713    88   16.9   5:27 (353, 47)  

* 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.  4   8 56.58  -38 18.8   5.159   5.334    94   16.7   4:06 (  0, 17)  
Dec. 11   8 51.21  -39 53.9   5.093   5.336    98   16.7   3:33 (  0, 15)  

* 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.  4   0 56.36  -13  9.6   2.675   3.212   114   16.9  20:03 (  0, 42)  
Dec. 11   0 58.78  -12 28.2   2.799   3.252   108   17.1  19:38 (  0, 43)  

* 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.  4  21 32.46   22  5.1   6.286   6.255    83   16.9  18:18 ( 66, 65)  
Dec. 11  21 33.95   21  2.4   6.407   6.270    77   17.0  18:19 ( 71, 59)  

* 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.  4  12  1.36  -53 13.4   3.899   3.519    60   17.0   5:22 (344, -1)  
Dec. 11  12  0.72  -53 37.7   3.875   3.564    64   17.0   5:27 (349,  0)  

* 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.  4  12 27.84    1 30.8   1.668   1.555    66   17.0   5:22 (309, 44)  
Dec. 11  12 46.02   -0 21.4   1.626   1.557    68   17.0   5:27 (315, 45)  

* 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.  4  22 16.10  -45 54.7   3.313   3.118    70   17.0  18:18 (  9,  8)  
Dec. 11  22 24.73  -43 49.3   3.380   3.114    66   17.0  18:19 ( 13, 10)  

* 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.  4  18 34.50   47  0.1   9.183   8.958    73   17.0  18:18 (126, 38)  
Dec. 11  18 37.85   47  4.2   9.209   8.965    72   17.1  18:19 (127, 34)  

* 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.  4   4 43.20   42 47.5   2.312   3.253   159   17.1  23:49 (180, 82)  
Dec. 11   4 35.36   42 25.5   2.369   3.307   159   17.1  23:14 (180, 83)  

* 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.  4   9  2.37   27 30.9   1.388   2.076   121   17.1   4:12 (  0, 82)  
Dec. 11   8 57.91   28 11.8   1.378   2.140   129   17.2   3:40 (  0, 83)  

* 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.  4   4 37.38    2 25.2   4.197   5.136   160   17.2  23:43 (  0, 57)  
Dec. 11   4 33.85    2 30.9   4.168   5.092   157   17.2  23:12 (  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.  4  22 32.12  -26  0.7   1.807   1.880    78   17.2  18:18 ( 10, 29)  
Dec. 11  22 43.81  -24 29.2   1.840   1.844    74   17.2  18:19 ( 14, 29)  

* 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.  4   3 54.66   33 35.8   4.477   5.434   164   17.2  23:00 (  0, 89)  
Dec. 11   3 43.23   33  5.4   4.499   5.425   158   17.2  22:21 (  0, 88)  

* 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.  4   5 56.89   24  4.5   1.657   2.614   162   17.3   1:07 (  0, 79)  
Dec. 11   5 51.57   24 54.4   1.621   2.597   170   17.2   0:34 (  0, 80)  

* 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.  4   1 22.70  -63 28.6   4.504   4.543    86   17.2  20:28 (  0, -8)  
Dec. 11   1 15.39  -61 42.3   4.619   4.606    83   17.3  19:54 (  0, -6)  

* (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.  4   2 36.91   34 26.1   1.258   2.169   150   17.2  21:42 (  0, 89)  
Dec. 11   2 20.74   32 11.0   1.275   2.134   141   17.4  20:59 (  0, 87)  

* 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.  4   9 20.04   42 20.3   1.199   1.889   119   17.3   4:29 (180, 83)  
Dec. 11   9 23.25   44  3.8   1.189   1.930   124   17.5   4:05 (180, 81)  

* 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.  4  14 39.23   40 44.9   7.563   7.268    69   17.4   5:22 (243, 38)  
Dec. 11  14 42.52   40 46.8   7.551   7.316    72   17.4   5:27 (244, 44)  

* 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.  4  14 35.64   -5 53.5   9.709   8.912    34   17.4   5:22 (289, 16)  
Dec. 11  14 36.80   -5 49.8   9.626   8.907    41   17.4   5:27 (295, 22)  

* 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. 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)  
Dec.  4  22 40.32  -16  8.2   2.797   2.864    83   17.5  18:18 (  9, 39)  
Dec. 11  22 46.48  -15 20.4   2.868   2.840    78   17.4  18:19 ( 16, 38)  

* 241P/LINEAR

Now it is 17.1 mag (Nov. 28, Toshihiko Ikemura, Hirohisa Sato). 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)  
Dec.  4   9 19.98   22 41.2   1.670   2.283   116   17.5   4:29 (  0, 78)  
Dec. 11   9 19.46   21 48.5   1.628   2.317   123   17.5   4:01 (  0, 77)  

* 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.  4   3 16.55   13 36.5   2.474   3.409   158   17.6  22:22 (  0, 69)  
Dec. 11   3 11.06   13 19.4   2.485   3.373   149   17.5  21:50 (  0, 68)  

* 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 17.7 mag (Dec. 1, Toshihiko Ikemura, Hirohisa Sato). 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)  
Dec.  4  23 45.14  -28 59.8   2.145   2.397    92   17.7  18:52 (  0, 26)  
Dec. 11  23 52.07  -27  3.4   2.275   2.449    88   18.0  18:32 (  0, 28)  

* 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.  4   4 57.73   11  3.7   0.948   1.924   168   17.7   0:09 (  0, 66)  
Dec. 11   4 33.70   16 29.6   0.961   1.937   168   17.8  23:10 (  0, 72)  

* 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.  4  16 40.63   48  0.7   6.411   6.147    70   17.7   5:22 (225, 21)  
Dec. 11  16 44.52   48 22.3   6.423   6.183    71   17.8   5:27 (227, 26)  

* 99P/Kowal 1

Now it is 17.4 mag (Nov. 23, F. Kugel, J. Nicolas, J.-G. Bosch). 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.  4  13 11.41   -6 12.3   5.260   4.732    52   17.8   5:22 (305, 31)  
Dec. 11  13 16.63   -6 45.8   5.166   4.729    58   17.8   5:27 (312, 35)  

* 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.  4   8  7.82    3 29.4   4.549   5.197   126   17.9   3:17 (  0, 58)  
Dec. 11   8  6.55    3 16.2   4.476   5.202   133   17.9   2:49 (  0, 58)  

---------------------------------------------------------------------

Copyright(C) Seiichi Yoshida (comet@aerith.net). All rights reserved.