Weekly Information about Bright Comets (2021 Dec. 11: North)

Japanese version
Home page
 Updated on December 16, 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 )

It brightened up to 5.1 mag in the morning sky (Dec. 12, Carlos Labordena). Then it brightened up to 3.2 mag in outburst on Dec. 15 (Dec. 15, Mike Olason). It turns to be observable in the evening low sky since mid December. It stays 4-5 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. 11  16 18.59    7  7.5   0.242   0.792    32    4.4   5:27 (268, 11)  
Dec. 18  19 39.40  -25 22.1   0.324   0.709    26    4.6  18:21 ( 55,  3)

* 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. 11   8 57.91   27 22.6   0.437   1.305   129    8.9   3:40 (  0, 82)  
Dec. 18   9  1.83   27 44.0   0.447   1.339   135    8.9   3:16 (  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. 11  23 40.73  -32  9.9   1.175   1.448    83    9.9  18:21 (  0, 23)  
Dec. 18  23 52.22  -27 43.6   1.176   1.415    81    9.6  18:21 (  4, 28)

* 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. 11   7 32.94   36 15.2   2.700   3.565   146    9.9   2:16 (180, 89)  
Dec. 18   7 26.76   35 15.2   2.647   3.560   154    9.9   1:42 (180, 90)

* 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. 11  23  0.14  -25  8.5   1.545   1.651    78   10.8  18:19 ( 10, 29)  
Dec. 18  23 19.87  -23 18.4   1.636   1.694    76   11.2  18:21 ( 13, 31)

* 4P/Faye

Now it is bright as 11.7 mag (Dec. 13, 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. 11   6 50.82    7 14.2   0.944   1.869   151   11.1   1:33 (  0, 62)  
Dec. 18   6 45.68    7  5.3   0.956   1.904   157   11.3   1:01 (  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. 11  17 40.81   15 11.0   5.308   4.582    38   11.2  18:19 (102,  9)  
Dec. 18  17 46.32   14 28.5   5.257   4.520    37   11.2  18:21 (105,  4)

* 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. 11  11 48.88  -28 35.4   4.713   4.498    71   12.6   5:27 (345, 25)  
Dec. 18  11 53.44  -28 56.5   4.602   4.479    76   12.5   5:31 (351, 25)

* 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. 11  15 51.32  -17  3.5   2.725   1.828    19   13.0   5:27 (292,  1)  
Dec. 18  16 10.66  -18  2.6   2.667   1.794    22   12.8   5:31 (294,  3)

* 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. 11  22 56.71   -8 53.2   0.731   1.154    83   13.1  18:19 ( 15, 45)  
Dec. 18  23 17.12   -7 54.5   0.715   1.123    81   12.8  18:21 ( 18, 46)

* 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. 11  14 53.47  -51  4.4   2.471   1.810    38   12.8   5:27 (326,-12)  
Dec. 18  15 16.04  -51 59.0   2.527   1.883    39   13.2   5:31 (327,-11)

* 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. 11  20 39.98  -16 59.8   2.275   1.792    49   12.9  18:19 ( 47, 23)  
Dec. 18  20 58.92  -15 52.1   2.339   1.811    46   13.2  18:21 ( 50, 22)

* 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. 11  18 54.29  -33  0.9   3.580   2.717    24   13.3  18:19 ( 53, -5)  
Dec. 18  19  9.61  -33 12.5   3.661   2.769    21   13.5  18:21 ( 55, -8)

* 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. 11   4 31.83   31 43.5   4.973   5.938   167   13.3  23:10 (  0, 87)  
Dec. 18   4 28.17   31 30.5   4.998   5.940   161   13.3  22:39 (  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. 11  14 39.73   -9 30.7   2.401   1.744    38   13.5   5:27 (297, 19)  
Dec. 18  14 58.43  -11 12.0   2.334   1.715    40   13.3   5:31 (301, 20)

* 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. 11  14 24.68    1 33.4   4.603   4.004    47   14.0   5:27 (291, 29)  
Dec. 18  14 26.49    2 21.8   4.535   4.038    54   14.0   5:31 (296, 35)

* 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. 11   1  3.74   -0 44.5   1.044   1.714   115   14.4  19:44 (  0, 54)  
Dec. 18   1 14.54    0 23.9   1.107   1.727   111   14.5  19:27 (  0, 56)

* 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. 11  12 49.30  -45 43.4   4.058   3.617    56   14.6   5:27 (339,  4)  
Dec. 18  12 49.43  -47 59.2   3.942   3.584    61   14.5   5:31 (345,  4)

* 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. 11  15 22.73  -18 31.7   2.993   2.149    25   14.7   5:27 (297,  5)  
Dec. 18  15 33.65  -19 48.7   3.037   2.241    30   14.9   5:31 (301,  8)

* 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. 11   8 41.22   17 20.9   1.721   2.478   130   15.2   3:23 (  0, 72)  
Dec. 18   8 39.76   16 46.6   1.664   2.484   138   15.1   2:54 (  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. 11  16  9.01  -21  6.5   4.150   3.207    14   15.2   5:27 (292, -5)  
Dec. 18  16 20.05  -21 43.6   4.110   3.197    19   15.2   5:31 (296, -1)

* 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. 11  22 32.25  -69 36.8   4.324   4.011    65   15.2  18:19 (  6,-15)  
Dec. 18  22 25.51  -68  1.1   4.346   3.967    61   15.2  18:21 ( 10,-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. 11  13  2.37   37 49.8   5.674   5.663    84   15.3   5:27 (254, 62)  
Dec. 18  13  4.38   38 52.2   5.521   5.607    89   15.2   5:31 (252, 68)

* 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. 11  16 27.82   31  2.0   5.980   5.475    55   15.3   5:27 (246, 20)  
Dec. 18  16 30.63   30 55.1   5.906   5.433    56   15.2   5:31 (249, 26)

* 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. 11  18 59.31   -3 19.7   3.640   2.861    32   15.4  18:19 ( 75, 14)  
Dec. 18  19  4.67   -4 41.7   3.638   2.799    27   15.3  18:21 ( 78,  9)

* 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. 11  16 51.37  -26 39.1   5.980   5.001     5   15.4   5:27 (292,-16)  
Dec. 18  16 55.17  -27 27.6   5.966   5.005    11   15.4   5:31 (296,-11)

* 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. 11  10  2.16   16 40.5   2.109   2.641   112   15.7   4:44 (  0, 72)  
Dec. 18  10  5.65   16 31.3   2.004   2.617   118   15.5   4:20 (  0, 71)

* 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. 11  22 29.47  -18 37.3   5.016   4.830    73   15.6  18:19 ( 20, 34)  
Dec. 18  22 32.32  -17 28.8   5.146   4.855    67   15.7  18:21 ( 28, 33)

* 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 fainter than this ephemeris recently. 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. 11  16 12.52   65  3.9   2.852   2.997    88   15.7   5:27 (211, 35)  
Dec. 18  16 18.55   66 31.8   2.796   2.985    91   15.7   5:31 (209, 38)

* 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. 11  16 12.29   17 36.8   3.067   2.442    43   15.7   5:27 (260, 17)  
Dec. 18  16 13.11   18 10.8   3.034   2.469    46   15.8   5:31 (264, 23)

* 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. 11  22 40.74  -60 29.3   4.202   3.913    66   15.7  18:19 (  7, -6)  
Dec. 18  22 50.68  -58 26.5   4.277   3.938    63   15.8  18:21 ( 10, -5)

* 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. 11  13 19.74   16 29.3   3.423   3.205    69   15.8   5:27 (288, 51)  
Dec. 18  13 19.48   15 41.1   3.338   3.229    75   15.8   5:31 (298, 56)

* 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. 11  20 33.30  -30 27.1   3.859   3.243    45   15.8  18:19 ( 40, 11)  
Dec. 18  20 43.98  -29 48.4   3.939   3.259    40   15.9  18:21 ( 43,  9)

* 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. 11   7 22.11   37 21.4   0.975   1.887   148   15.8   2:05 (180, 88)  
Dec. 18   7 16.99   38 33.0   0.982   1.918   154   16.0   1:32 (180, 87)

* 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. 11   6 30.26    1 34.6   3.046   3.938   151   15.9   1:13 (  0, 57)  
Dec. 18   6 26.29    2  3.4   3.018   3.938   156   15.8   0:41 (  0, 57)

* 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. 11   2  2.75   11 56.6   3.051   3.800   133   15.9  20:42 (  0, 67)  
Dec. 18   2  2.67   11 37.3   3.133   3.802   126   15.9  20:14 (  0, 67)

* 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. 11  18  2.15   20 23.0   6.268   5.617    45   16.0  18:19 (104, 16)  
Dec. 18  18  6.93   19 44.5   6.240   5.568    43   15.9  18:21 (107, 11)

* 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. 11  22  0.18    6  3.6   2.635   2.583    76   16.2  18:19 ( 44, 53)  
Dec. 18  22  4.07    4 57.7   2.645   2.482    69   16.1  18:21 ( 51, 48)

* 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. 11  10 25.75   79 19.2   3.435   3.949   114   16.1   5:08 (180, 46)  
Dec. 18  10 39.46   82 11.5   3.408   3.930   115   16.1   4:54 (180, 43)

* 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. 11  11 10.69    7 49.6   1.723   2.033    93   16.2   5:27 (347, 62)  
Dec. 18  11 20.40    7 19.8   1.658   2.042    97   16.1   5:31 (358, 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. 11  15 25.36    7 31.1   5.448   4.736    40   16.3   5:27 (275, 21)  
Dec. 18  15 31.51    8 15.5   5.388   4.743    44   16.3   5:31 (279, 26)

* 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. 11   3 59.78    5 47.9   1.802   2.729   155   16.3  22:38 (  0, 61)  
Dec. 18   3 54.09    6 11.1   1.881   2.770   148   16.5  22:05 (  0, 61)

* 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. 11   4 40.97  -15 52.8   3.047   3.858   140   16.6  23:19 (  0, 39)  
Dec. 18   4 36.34  -15 19.9   3.088   3.876   138   16.6  22:47 (  0, 40)

* 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. 11  22 30.63   55 24.1   3.023   3.386   103   16.7  18:19 (155, 66)  
Dec. 18  22 31.67   54 19.7   3.007   3.310    99   16.6  18:21 (146, 64)

* 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. 11  23 40.84  -13 17.3   2.139   2.377    91   16.7  18:21 (  0, 42)  
Dec. 18  23 49.35  -12 16.0   2.235   2.390    86   16.8  18:21 (  6, 43)

* 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. 11   8 51.21  -39 53.9   5.093   5.336    98   16.7   3:33 (  0, 15)  
Dec. 18   8 44.77  -41 23.7   5.035   5.338   102   16.7   2:59 (  0, 14)

* 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. 11  12  3.88    1  2.2   1.817   1.885    78   16.7   5:27 (328, 51)  
Dec. 18  12 14.37   -0 42.1   1.769   1.907    82   16.7   5:31 (337, 52)

* 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. 11  23 27.77    6 12.6   1.980   2.304    96   16.7  18:19 (  6, 61)  
Dec. 18  23 36.21    7  4.8   2.079   2.321    91   16.9  18:21 ( 17, 61)

* 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. 11  12 46.02   -0 21.4   1.626   1.557    68   17.0   5:27 (315, 45)  
Dec. 18  13  3.80   -2 10.0   1.585   1.562    70   16.9   5:31 (321, 45)

* 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. 11  11  4.66   -7 37.9   1.426   1.713    88   16.9   5:27 (353, 47)  
Dec. 18  11 10.71   -9  6.5   1.404   1.764    93   17.2   5:24 (  0, 46)

* 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. 11  21 33.95   21  2.4   6.407   6.270    77   17.0  18:19 ( 71, 59)  
Dec. 18  21 35.83   20  5.9   6.527   6.285    71   17.0  18:21 ( 76, 53)

* 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. 11  12  0.72  -53 37.7   3.875   3.564    64   17.0   5:27 (349,  0)  
Dec. 18  11 58.72  -54  1.3   3.845   3.610    68   17.1   5:31 (354,  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. 11  22 24.73  -43 49.3   3.380   3.114    66   17.0  18:19 ( 13, 10)  
Dec. 18  22 33.62  -41 44.2   3.446   3.111    62   17.1  18:21 ( 18, 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. 11  18 37.85   47  4.2   9.209   8.965    72   17.1  18:19 (127, 34)  
Dec. 18  18 41.37   47 12.9   9.231   8.973    71   17.1  18:21 (129, 30)

* 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. 11   0 58.78  -12 28.2   2.799   3.252   108   17.1  19:38 (  0, 43)  
Dec. 18   1  1.93  -11 42.2   2.928   3.292   103   17.3  19:14 (  0, 43)

* 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. 11   4 33.85    2 30.9   4.168   5.092   157   17.2  23:12 (  0, 58)  
Dec. 18   4 30.41    2 40.9   4.152   5.048   152   17.1  22:41 (  0, 58)

* 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. 11   5 51.57   24 54.4   1.621   2.597   170   17.2   0:34 (  0, 80)  
Dec. 18   5 45.63   25 44.5   1.598   2.581   177   17.1   0:01 (  0, 81)

* 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. 11  22 43.81  -24 29.2   1.840   1.844    74   17.2  18:19 ( 14, 29)  
Dec. 18  22 56.36  -22 50.0   1.871   1.811    71   17.1  18:21 ( 19, 30)

* 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. 11   4 35.36   42 25.5   2.369   3.307   159   17.1  23:14 (180, 83)  
Dec. 18   4 28.32   41 56.3   2.440   3.362   155   17.3  22:39 (180, 83)

* 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. 11   3 43.23   33  5.4   4.499   5.425   158   17.2  22:21 (  0, 88)  
Dec. 18   3 32.41   32 30.2   4.542   5.417   149   17.2  21:43 (  0, 88)

* 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. 11   8 57.91   28 11.8   1.378   2.140   129   17.2   3:40 (  0, 83)  
Dec. 18   8 51.39   28 55.7   1.375   2.203   137   17.3   3:06 (  0, 84)

* 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. 11   1 15.39  -61 42.3   4.619   4.606    83   17.3  19:54 (  0, -6)  
Dec. 18   1 10.33  -59 53.7   4.736   4.669    80   17.4  19:21 (  0, -5)

* (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. 11   2 20.74   32 11.0   1.275   2.134   141   17.4  20:59 (  0, 87)  
Dec. 18   2  7.64   29 53.7   1.306   2.096   131   17.5  20:18 (  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. 11  14 36.80   -5 49.8   9.626   8.907    41   17.4   5:27 (295, 22)  
Dec. 18  14 37.76   -5 44.3   9.532   8.901    47   17.4   5:31 (300, 28)

* 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. 11  14 42.52   40 46.8   7.551   7.316    72   17.4   5:27 (244, 44)  
Dec. 18  14 45.49   40 53.6   7.535   7.364    76   17.4   5:31 (246, 49)

* 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. 11  22 46.48  -15 20.4   2.868   2.840    78   17.4  18:19 ( 16, 38)  
Dec. 18  22 53.35  -14 28.3   2.937   2.816    73   17.4  18:21 ( 23, 38)

* 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. 11   3 11.06   13 19.4   2.485   3.373   149   17.5  21:50 (  0, 68)  
Dec. 18   3  6.29   13  6.2   2.510   3.338   141   17.5  21:17 (  0, 68)

* 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. 11   9 23.25   44  3.8   1.189   1.930   124   17.5   4:05 (180, 81)  
Dec. 18   9 23.76   45 47.8   1.186   1.971   130   17.7   3:38 (180, 79)

* 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. 11   9 19.46   21 48.5   1.628   2.317   123   17.5   4:01 (  0, 77)  
Dec. 18   9 17.21   20 59.2   1.592   2.353   130   17.6   3:32 (  0, 76)

* 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. 11  13 16.63   -6 45.8   5.166   4.729    58   17.8   5:27 (312, 35)  
Dec. 18  13 21.54   -7 17.0   5.067   4.726    64   17.7   5:31 (319, 38)

* 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. 11  16 44.52   48 22.3   6.423   6.183    71   17.8   5:27 (227, 26)  
Dec. 18  16 48.37   48 50.8   6.432   6.219    73   17.8   5:31 (229, 30)

* 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. 11   4 33.70   16 29.6   0.961   1.937   168   17.8  23:10 (  0, 72)  
Dec. 18   4 10.21   21 33.3   1.003   1.953   158   17.9  22:20 (  0, 77)

* 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. 11   1 45.03   27  2.3   2.009   2.779   133   18.0  20:23 (  0, 82)  
Dec. 18   1 33.91   23 31.1   2.031   2.701   123   17.9  19:45 (  0, 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. 11   9 54.25  -26 42.0   2.120   2.422    95   18.0   4:36 (  0, 28)  
Dec. 18  10  1.02  -27 26.8   2.039   2.407    99   17.9   4:15 (  0, 27)

* 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. 11   8  6.55    3 16.2   4.476   5.202   133   17.9   2:49 (  0, 58)  
Dec. 18   8  4.75    3  6.7   4.413   5.207   140   17.9   2:19 (  0, 58)

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

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