Weekly Information about Bright Comets (2021 May 15: North)

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Updated on May 15, 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/2020 T2 ( Palomar )

It brightened rapidly. Now it is very bright as 10.6 mag (May 12, Chris Wyatt). It stays observable at 11 mag in good condition for a long time from spring to summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  13 38.77   29  2.7   1.415   2.164   125   11.1  22:05 (  0, 84)  
May  22  13 36.79   26 49.7   1.422   2.140   122   11.1  21:36 (  0, 82)  

* C/2020 R4 ( ATLAS )

It brightened up to 8.9 mag in April (Apr. 12, Carlos Labordena). Now it is fading. But it is still bright as 10.1 mag (May 11, Carlos Labordena). It stays observable in excellent condition for a while. It will be fading after this, and it will fade down to 13 mag at the end of May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  11 45.82   27 25.1   0.920   1.576   109   11.3  20:34 ( 34, 81)  
May  22  11 22.06   24 43.3   1.148   1.656    99   12.1  20:42 ( 65, 69)  

* 7P/Pons-Winnecke

Now it is bright as 12.7 mag (May 9, Jose Guilherme de S. Aguiar). It stays bright as 11-12 mag until August. In the Southern Hemisphere, it stays observable in excellent condition for a long time. In the Northern Hemisphere, it stays observable in good condition for a while. But it becomes extremely low after July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  20 24.56   -1 30.8   0.505   1.243   105   12.2   3:18 (323, 47)  
May  22  20 52.21   -5 12.3   0.478   1.236   106   11.9   3:11 (324, 43)  

* 10P/Tempel 2

Now it is 11.2 mag (Apr. 19, Chris Wyatt). Appearing in the morning sky in the Southern Hemisphere. In the Northern Hemisphere, it will appear in the morning sky in June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15   1  2.95   -0 28.7   2.137   1.513    40   12.1   3:18 (268, -3)  
May  22   1 22.02    0 55.4   2.135   1.540    42   12.2   3:11 (267, -2)  

* C/2019 L3 ( ATLAS )

Now it is 12.8 mag (Apr. 27, Thomas Lehmann). It will brighten up to 10 mag in winter in 2022. In the Northern Hemisphere, it stays observable in good condition for a long time, although it becomes extremely low temporarily from May to June. In the Southern Hemisphere, it is not observable until November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15   3 43.59   50 33.2   4.981   4.158    31   12.7  20:34 (149,  8)  
May  22   3 57.30   50 26.4   4.970   4.126    30   12.6  20:42 (151,  6)  

* C/2017 K2 ( PanSTARRS )

Now it is 13.5 mag (May 8, Sandor Szabo). It is expected to be observable at 5-6 mag for a long time from 2022 to 2023. In the Northern Hemisphere, it is not observable at the high light from 2022 summer to 2023 summer. In the Southern Hemisphere, it stays extremely low for a while. But it will be observable in good condition at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  18 13.55   42 56.7   5.996   6.371   107   12.9   2:43 (180, 82)  
May  22  18  8.67   43 16.5   5.906   6.314   109   12.9   2:11 (180, 82)  

* C/2020 J1 ( SONEAR )

Now it is bright as 12.8 mag (May 9, Hirohisa Sato). It stays 13 mag until early summer. In the Southern Hemisphere, it stays observable in good condition for a long time. It is getting higher slowly also in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  15 29.01  -29 54.4   2.367   3.364   168   13.0   0:01 (  0, 25)  
May  22  15 10.15  -27 21.9   2.374   3.370   167   13.0  23:08 (  0, 28)  

* 4P/Faye

Now it is 14.5 mag (May 9, Ken-ichi Kadota). It will brighten up to 10 mag from summer to autumn, and it will be observable in excellent condition. Appearing in the morning sky.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15   0  4.07    4 23.3   2.459   1.994    51   13.7   3:18 (273, 12)  
May  22   0 19.83    5 51.7   2.371   1.956    54   13.5   3:11 (272, 13)  

* 246P/NEAT

Now it is 14.5 mag (May 3, Ken-ichi Kadota). It stays 13-14 mag from 2020 to 2021. It will be observable in good condition after this in the Southern Hemisphere. It locates somewhat low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  19 29.55  -27 14.0   2.208   2.898   124   13.6   3:18 (350, 27)  
May  22  19 30.20  -27 58.1   2.141   2.904   130   13.6   3:11 (355, 27)  

* 29P/Schwassmann-Wachmann 1

Now it is not observable. It will appear in the morning sky in July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15   3 31.65   27  1.8   6.878   5.880     8   14.0  20:34 (135,-11)  
May  22   3 37.82   27 20.7   6.882   5.882     8   14.0   3:11 (226,-10)  

* C/2019 T4 ( ATLAS )

Now it is 14.5 mag (Apr. 30, Chris Wyatt). It is expected to brighten up to 11.5 mag in 2022. It is observable in excellent condition in the Southern Hemisphere. In the Northern Hemisphere, it is not observable until November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15   8 19.47  -27 18.0   5.305   5.304    84   14.2  20:34 ( 49,  8)  
May  22   8 24.58  -26 27.7   5.345   5.271    80   14.1  20:42 ( 54,  3)  

* C/2021 D1 ( SWAN )

It brightened up to 10.5 mag in early March (Mar. 8, Bob King). Now it is fading. But it is still bright as 13.6 mag (Apr. 21, Ken-ichi Kadota). In the Northern Hemisphere, it stays observable in the evening low sky until early June while the comet will be fading. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15   5 48.33   32 23.2   2.301   1.575    34   14.3  20:34 (119, 15)  
May  22   6 12.84   31 14.8   2.422   1.664    32   14.6  20:42 (120, 12)  

* 15P/Finlay

Now it is very bright as 13.3 mag (May 10, Alan Hale). It will brighten very rapidly, and it will brighten up to 10 mag from July to August. 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)  
May  15  23 14.04  -12 28.1   1.239   1.299    69   15.1   3:18 (294, 11)  
May  22  23 43.67   -9  7.1   1.182   1.241    68   14.4   3:11 (290, 12)  

* 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 14.3 mag (Apr. 30, Chris Wyatt). 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)  
May  15   4 36.15  -55  6.8   2.744   2.674    75   14.4  20:34 ( 44,-41)  
May  22   4 43.39  -54  4.5   2.816   2.737    75   14.6  20:42 ( 46,-45)  

* C/2019 F1 ( ATLAS-Africano )

Now it is 14.9 mag (Apr. 19, Chris Wyatt). It was expected to brighten up to 13 mag from spring to summer. But actually, it is fainter than originally expected. It stays 14-15 mag until early autumn. 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)  
May  15  21  1.84  -77  2.4   3.145   3.613   109   14.5   3:18 (352,-24)  
May  22  21 23.52  -78 31.5   3.112   3.607   111   14.5   3:11 (353,-25)  

* C/2019 T2 ( Lemmon )

It will brighten up to 14.5 mag from spring to summer. In the Southern Hemisphere, it stays observable in excellent condition 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)  
May  15   1 33.46  -60 17.6   2.595   2.657    82   14.7   3:18 (323,-35)  
May  22   2  6.36  -62 47.8   2.539   2.665    85   14.7   3:11 (326,-37)  

* C/2018 U1 ( Lemmon )

Now it is 15.3 mag (May 8, Sandor Szabo). It will stay at 14-15 mag for a long time from 2021 to 2022. It stays observable in good condition after this while brightening gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  17 56.40   -0 10.4   4.361   5.165   138   14.8   2:27 (  0, 55)  
May  22  17 49.63   -0 43.5   4.283   5.152   145   14.8   1:52 (  0, 54)  

* C/2020 F5 ( MASTER )

Now it is 15.3 mag (Apr. 19, Chris Wyatt). It stays 14-15 mag until the end of 2021. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable until June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  23 31.20  -36 21.7   4.438   4.347    78   14.9   3:18 (310, -7)  
May  22  23 35.13  -35 52.8   4.356   4.353    83   14.9   3:11 (312, -4)  

* 8P/Tuttle

Now it is 17.5 mag (Apr. 20, J.-F. Soulier). Brightening very rapidly. It will brighten up to 8.5 mag from September to October. But the condition is bad in this apparition. In the Northern Hemisphere, it is observable only in the extremely low sky until July. In the Southern Hemisphere, it will be observable after late August. But it stays locating low for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15   2 22.86   45 24.0   2.612   1.805    29   15.4   3:18 (221, 10)  
May  22   2 48.98   45 26.9   2.553   1.733    28   15.0   3:11 (220, 10)  

* C/2021 A7 ( NEOWISE )

Now it is 15.6 mag (Apr. 12, Chris Wyatt). It stays 15 mag until summer. In the Southern Hemisphere, it stays observable in good condition until June. In the Northern Hemisphere, it is observable in the low sky from March to May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15   7 31.97   -8 18.6   2.299   2.105    66   15.0  20:34 ( 71, 12)  
May  22   7 44.34   -5  4.0   2.354   2.076    61   15.0  20:42 ( 77, 10)  

* 117P/Helin-Roman-Alu 1

Now it is 14.4 mag (May 7, Sandor Szabo). It will brighten up to 13 mag in 2022. In 2021, it is observable at 14-15 mag in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  13  3.88    0  4.2   2.776   3.611   140   15.3  21:30 (  0, 55)  
May  22  13  1.36   -0  0.2   2.828   3.595   132   15.3  21:00 (  0, 55)  

* C/2020 M5 ( ATLAS )

Now it is 15.6 mag (May 8, Sandor Szabo). In the Northern Hemisphere, it stays observable at 15-16 mag for a long time from spring to early 2022. In the Southern Hemisphere, it is not observable until the end of 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  17 43.70   79 51.4   3.174   3.153    79   15.5   2:14 (180, 45)  
May  22  16 17.20   80 31.6   3.163   3.133    79   15.4   0:22 (180, 45)  

* 201P/LONEOS

It has not been observed yet in this apparition. The condition of this apparition is bad. It brightens up to 15.5 mag in spring, however, it is not observable until autumn when it becomes fainter than 19 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15   3 16.54   19 48.6   2.235   1.226     2   15.6   3:18 (231,-16)  
May  22   3 43.72   21 41.7   2.229   1.219     2   15.5   3:11 (229,-15)  

* C/2018 N2 ( ASASSN )

Now it is 15.4 mag (Apr. 19, 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)  
May  15  14 16.10   67 50.8   5.746   5.875    92   15.6  22:41 (180, 57)  
May  22  14  4.69   66 54.4   5.829   5.923    90   15.6  22:02 (180, 58)  

* C/2020 H6 ( ATLAS )

Now it is 16.0 mag (May 7, Sandor Szabo). It stays observable at 16 mag from 2021 to 2022. Toshihiko Ikemura and Hirohisa Sato reported it was very bright as 14.2 mag on Apr. 19.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  13 50.29   -9 10.1   3.897   4.830   154   15.7  22:17 (  0, 46)  
May  22  13 46.70   -7 41.4   3.941   4.818   146   15.7  21:46 (  0, 47)  

* C/2017 T2 ( PanSTARRS )

It had been observed as 8-9 mag for a long time in 2020. Now it is fading. It has already faded down to 16.4 mag (Mar. 27, Thomas Lehmann). It will be observable in good condition after this in the Southern Hemisphere. It locates extremely low after this in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  17 18.45  -44 34.6   3.771   4.638   145   15.7   1:49 (  0, 10)  
May  22  17 10.71  -45 13.9   3.794   4.702   150   15.8   1:14 (  0, 10)  

* 17P/Holmes

Now it is 15.8 mag (Jan. 16, Slooh.com Canary Islands Observatory). Appearing in the morning sky. In the Northern Hemisphere, it stays observable in good condition while the comet will be fading. In the Southern Hemipsphere, it stays locating extremely low after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15   1 42.78   22 37.6   3.058   2.180    24   15.8   3:18 (244,  3)  
May  22   1 57.29   24 23.6   3.045   2.196    27   15.9   3:11 (243,  5)  

* C/2019 K7 ( Smith )

Now it is 15.7 mag (May 8, Sandor Szabo). It stays 15-16 mag until July. 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)  
May  15  18 52.65   51 43.5   4.996   5.207    96   15.8   3:18 (182, 73)  
May  22  18 43.28   53 15.4   4.999   5.236    97   15.9   2:45 (180, 72)  

* C/2020 Y2 ( ATLAS )

Now it is 16.0 mag (Apr. 4, Michael Jager). Toshihiko Ikemura and Hirohisa Sato reported it was bright as 14.7 mag on Apr. 18. 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 stays observable until June, but it will not be observable at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  12 35.09  -20 42.1   4.028   4.843   139   15.9  21:01 (  0, 34)  
May  22  12 27.98  -20 35.6   4.063   4.797   131   15.9  20:42 (  4, 34)  

* C/2020 S3 ( Erasmus )

It brightened up to 5.6 mag in early December (Dec. 9, Marco Goiato). In mid December, it was visible at about 3 mag in the SOHO spacecraft images (Dec. 18, Hirohisa Sato). Appearing in the morning sky.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15   0  2.24   14 45.9   3.359   2.802    49   16.1   3:18 (264, 18)  
May  22   0  7.36   15 36.7   3.371   2.895    54   16.3   3:11 (265, 21)  

* C/2020 S8 ( Lemmon )

It brightened rapidly. Now it is bright as 15.8 mag (May 5, Katsumi Yoshimoto). It will be fading after this, and it will be fainter than 18 mag in July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  12 46.68    5 31.5   1.582   2.394   133   16.3  21:12 (  0, 60)  
May  22  12 27.03    3 10.3   1.691   2.408   123   16.5  20:42 (  8, 58)  

* C/2019 O3 ( Palomar )

Now it is 16.3 mag (Apr. 19, Toshihiko Ikemura, Hirohisa Sato). It stays at 16-17 mag from 2020 to 2021. In the Northern Hemisphere, it stays observable in good condition for a long time. It locates extremely low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  19 41.31   45 50.1   8.708   8.828    93   16.3   3:18 (219, 75)  
May  22  19 38.41   46 46.9   8.664   8.830    96   16.3   3:11 (203, 77)  

* C/2020 O2 ( Amaral )

Now it is 16.6 mag (Apr. 21, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 16.5-17 mag in good condition until October.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  17 19.92  -26 59.3   4.011   4.931   152   16.4   1:50 (  0, 28)  
May  22  17 14.82  -25 54.0   3.955   4.923   160   16.4   1:18 (  0, 29)  

* C/2017 Y2 ( PanSTARRS )

Now it is 16.4 mag (Apr. 24, ATLAS-MLO, Mauna Loa). It is observable at 16.5 mag from spring in 2020 to summer in 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  16 53.40  -16 23.8   3.918   4.876   159   16.4   1:24 (  0, 39)  
May  22  16 43.12  -16 54.7   3.899   4.894   168   16.4   0:46 (  0, 38)  

* C/2019 T3 ( ATLAS )

Now it is 16.5 mag (Apr. 20, Toshihiko Ikemura, Hirohisa Sato). It is observable at 16 mag from 2020 to 2021. In the Southern Hemisphere, it is not observable until summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  23 19.10   43 39.7   6.459   5.969    57   16.4   3:18 (238, 38)  
May  22  23 19.61   43 56.5   6.399   5.973    60   16.4   3:11 (239, 42)  

* C/2019 U5 ( PanSTARRS )

Now it is 16.2 mag (May 9, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 11 mag in 2023. In the Northern Hemisphere, it stays observable in good condition for a long time. It locates extremely low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  18  4.13   49 28.1   6.485   6.790   103   16.5   2:34 (180, 76)  
May  22  17 56.23   50  3.4   6.417   6.745   104   16.5   1:58 (180, 75)  

* 156P/Russell-LINEAR

Brightened rapidly, and it brightened up to 9.7 mag in November (Nov. 15, Chris Wyatt). Now it is fading. It has already faded down to 15.9 mag (Apr. 30, Catalina Sky Survey). In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it locates extremely low after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15   7 34.63   36 25.9   2.688   2.293    56   16.5  20:34 (113, 36)  
May  22   7 50.38   35 30.0   2.801   2.343    53   16.8  20:42 (113, 32)  

* C/2020 V2 ( ZTF )

Now it is 16.7 mag (Apr. 27, ATLAS-HKO, Haleakala). 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 extremely low until mid July, then it becomes unobservable for a while. But it becomes observable in good condition after 2023 summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  12 15.51   39  1.7   6.932   7.290   106   16.8  20:42 (180, 86)  
May  22  12 11.78   38 59.0   6.975   7.237   101   16.8  20:42 (124, 83)  

* C/2021 A1 ( Leonard )

Now it is 16.7 mag (Apr. 19, Toshihiko Ikemura, Hirohisa Sato). It will approach to Earth down to 0.2 a.u. in December, and it is expected to brighten up to 4 mag. In the Northern Hemisphere, it stays observable in good condition for a long time until December while the comet is brightening gradually. In the Southern Hemisphere, it is not observable until mid December.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  11  3.68   59 53.7   3.598   3.654    85   16.9  20:34 (162, 63)  
May  22  10 52.92   58 51.2   3.608   3.572    79   16.8  20:42 (151, 60)  

* 67P/Churyumov-Gerasimenko

Now it is 17.4 mag (Apr. 25, Telescope Live, El Sauce). It will brighten up to 9 mag, and will be observable in good condition in winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  23  4.33   -9 51.3   2.377   2.256    70   17.1   3:18 (294, 15)  
May  22  23 16.45   -8 41.0   2.248   2.201    74   16.9   3:11 (294, 17)  

* 413P/2020 W4 ( Larson )

First return of a new periodic comet which brightened up to 16 mag in 2014. Now it is 17.0 mag (Apr. 27, Thomas Lehmann). It stays observable at 16-17 mag in good condition until July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  12  8.65    7 15.0   1.460   2.198   124   17.0  20:36 (  0, 62)  
May  22  12  9.07    5 50.0   1.512   2.187   118   17.0  20:42 ( 17, 60)  

* C/2017 U7 ( PanSTARRS )

Now it is 16.7 mag (Apr. 11, Toshihiko Ikemura, Hirohisa Sato). It will be fading slowly.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  18  2.69  -14 48.2   6.777   7.604   142   17.0   2:33 (  0, 40)  
May  22  17 57.57  -14 25.8   6.734   7.629   150   17.0   2:00 (  0, 41)  

* 284P/McNaught

Now it is 19.3 mag (Apr. 12, J. L. Virlichie, P. Traverse). It will brighten up to 15 mag from summer to autumn, and it will be observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  22 14.01   -7 22.3   2.379   2.441    81   17.1   3:18 (301, 26)  
May  22  22 23.66   -6 47.4   2.282   2.425    85   17.0   3:11 (302, 28)  

* C/2020 R7 ( ATLAS )

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)  
May  15   3 13.80  -42  4.2   5.851   5.432    60   17.2   3:18 (296,-48)  
May  22   3 18.25  -42 21.7   5.762   5.383    63   17.1   3:11 (297,-45)  

* 409P/2020 V1 ( LONEOS-Hill )

First return of a new periodic comet which brightened up to 14-15 mag in 2006. It brightened up to 14.5 mag in March (Mar. 16, F. Kugel, J.-G. Bosch). Now it is fading. It has already faded down to 16.7 mag (Apr. 27, Thomas Lehmann). It will be fainter than 18 mag in June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  13 18.28   20  2.7   1.295   2.093   129   17.1  21:45 (  0, 75)  
May  22  13 20.70   18 59.3   1.380   2.133   125   17.4  21:20 (  0, 74)  

* 106P/Schuster

It has not been observed yet in this apparition. It will brighten up to 15 mag from summer to autumn. In the Southern Hemisphere, it stays observable for a long time. In the Northern Hemisphere, it is not observable until late June. But it will be observable in good condition after that.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15   1  2.23   -7 24.2   2.408   1.826    44   17.5   3:18 (274, -7)  
May  22   1 19.06   -5 19.0   2.336   1.788    46   17.2   3:11 (273, -5)  

* 6P/d'Arrest

Now it is 18.5 mag (May 9, Toshihiko Ikemura, Hirohisa Sato). It will brighten very rapidly, and it will be 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)  
May  15  16 48.40   15 28.2   1.037   1.926   140   17.5   1:19 (  0, 70)  
May  22  16 44.40   16 36.0   0.979   1.877   141   17.3   0:47 (  0, 72)  

* C/2020 N1 ( PanSTARRS )

Now it is 17.0 mag (Apr. 14, Thomas Lehmann). It will be fading after this. In the Northern Hemisphere, it will be too low to observe in May. In the Southern Hemisphere, it stays observable in good condition after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15   7 36.95   -1 13.8   1.772   1.619    64   17.3  20:34 ( 75, 18)  
May  22   7 57.44   -3  0.9   1.857   1.678    63   17.5  20:42 ( 76, 14)  

* 57P/du Toit-Neujmin-Delporte

Now it is 18.4 mag (May 9, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 15.5 mag from summer to autumn. It stays observable for a long time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  15 31.61  -15 12.5   1.191   2.201   176   17.6   0:02 (  0, 40)  
May  22  15 25.66  -14 39.1   1.160   2.166   171   17.4  23:24 (  0, 40)  

* C/2020 F2 ( ATLAS )

Now it is 17.0 mag (Apr. 30, 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)  
May  15  14 55.39   -8 19.8   8.169   9.157   167   17.5  23:22 (  0, 47)  
May  22  14 50.89   -7 54.9   8.188   9.146   160   17.5  22:50 (  0, 47)  

* C/2020 F7 ( Lemmon )

Now it is 17.0 mag (Apr. 22, ATLAS-HKO, Haleakala). It brightened rapidly. It stays 17-18 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 is observable only until May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15   8 15.74   -7 46.4   5.659   5.502    75   17.6  20:34 ( 64, 21)  
May  22   8 16.47   -8  1.0   5.748   5.489    70   17.6  20:42 ( 69, 14)  

* C/2021 D2 ( ZTF )

Now it is 17.5 mag (Apr. 24, Ken-ichi Kadota). It will brighten up to 15.5 mag in winter. In the Northern Hemisphere, it stays observable in good condition for a long time. It is not observable at all in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  21 12.05   51 23.9   4.009   3.919    77   17.6   3:18 (226, 60)  
May  22  21 11.40   54  3.5   3.926   3.877    79   17.6   3:11 (219, 61)  

* P/2014 W12 ( Gibbs )

First return of a new periodic comet observed at 17 mag in 2014. It has not been observed yet in this apparition. It is expected to brighten up to 17 mag from summer to autumn, and it will be observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  23 15.75   -2 14.5   1.866   1.708    65   17.7   3:18 (286, 18)  
May  22  23 32.10    0  6.6   1.808   1.697    67   17.6   3:11 (284, 20)  

* C/2020 K1 ( PanSTARRS )

Now it is 17.2 mag (Apr. 28, ATLAS-HKO, Haleakala). It is expected to brighten up to 12 mag in 2023. In the Northern Hemisphere, it is observable in good condition in 2021. But it is observable only until November in 2022. In the Southern Hemisphere, it locates extremely low in 2021. But it will be observable in good condition at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  18 38.78   45 58.0   6.789   7.069   102   17.7   3:08 (180, 79)  
May  22  18 34.58   46 15.7   6.703   7.021   104   17.6   2:37 (180, 79)  

* 22P/Kopff

Now it is 17.4 mag (Apr. 19, ATLAS-HKO, Haleakala). It will be observable at 11 mag from winter to spring in 2022. In 2021, it is observable until July or August when it brightens up to 16-17 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  10 20.95   14 37.6   2.752   3.055    97   17.7  20:34 ( 56, 59)  
May  22  10 23.52   14 18.4   2.812   3.015    91   17.6  20:42 ( 65, 52)  

* 152P/Helin-Lawrence

Now it is 17.6 mag (Apr. 11, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 16 mag in 2022. In 2021, it stays observable at 18 mag until September.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  13 24.68    3 58.1   2.497   3.354   142   17.7  21:51 (  0, 59)  
May  22  13 22.05    3 48.6   2.543   3.341   135   17.6  21:21 (  0, 59)  

* C/2020 M3 ( ATLAS )

It brightened up to 7.3 mag in November (Nov. 7, Marco Goiato). Now it is fading. It has already faded down to 17.3 mag (Apr. 23, Thomas Lehmann). In the Northern Hemisphere, it stays observable in excellent condition for a long time. In the Southern Hemisphere, it stays locating extremely low after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15   8 22.02   39 50.6   3.218   2.952    65   17.7  20:34 (113, 46)  
May  22   8 33.36   38 59.6   3.367   3.024    61   17.9  20:42 (114, 41)  

* (301964) 2000 EJ37

Peculiar asteroid moving along a cometary orbit. The condition is bad in this apparition. It brightened up to 17 mag in winter, but it was not observable. Appearing in the morning sky. But it will be fainter than 18 mag soon.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15   0 57.25    6 40.6   2.391   1.717    38   17.7   3:18 (263,  2)  
May  22   1 13.12    7 50.0   2.400   1.766    41   17.8   3:11 (263,  4)  

* C/2019 C1 ( ATLAS )

Now it is 17.5 mag (Apr. 18, Toshihiko Ikemura, Hirohisa Sato). Fading slowly. In 2021, it stays observable at 17-18 mag in good condition until early summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  12 55.84  -14  8.8   6.196   7.035   143   17.7  21:23 (  0, 41)  
May  22  12 55.08  -13 37.2   6.281   7.051   136   17.8  20:54 (  0, 41)  

* 99P/Kowal 1

Now it is 17.1 mag (Apr. 18, Toshihiko Ikemura, Hirohisa Sato). It stays 17-18 mag for a long time from 2021 to 2023.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  10 37.90   11 51.0   4.549   4.869   102   17.7  20:34 ( 47, 59)  
May  22  10 39.44   11 34.7   4.648   4.862    96   17.8  20:42 ( 57, 53)  

* C/2017 B3 ( LINEAR )

It brightened up to 13.8 mag in autumn in 2019 (Sept. 3, 2019, Chris Wyatt). Now it is fading slowly. It stays 18 mag until autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15   0 39.76   15 24.8   8.479   7.732    39   17.8   3:18 (258, 11)  
May  22   0 42.11   16  1.3   8.447   7.775    45   17.8   3:11 (260, 14)  

* C/2020 T4 ( PanSTARRS )

In the Northern Hemisphere, it is observable at 17-18 mag from spring to autumn. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15   2 35.34   58 33.3   2.937   2.271    40   17.9   3:18 (209, 17)  
May  22   2 49.32   61 22.4   2.889   2.251    42   17.8   3:11 (207, 20)  

* C/2016 Q2 ( PanSTARRS )

Now it is 18.2 mag (Apr. 19, Toshihiko Ikemura, Hirohisa Sato). In the Northern Hemisphere, it stays observable at 18 mag for a long time from 2021 to 2022. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  17 41.10   54 20.6   6.812   7.082   101   17.9   2:11 (180, 71)  
May  22  17 31.79   55  5.2   6.806   7.082   101   17.9   1:34 (180, 70)  

* 47P/Ashbrook-Jackson

Now it is 18.6 mag (Apr. 4, Michael Jager). Although it is around the aphelion, it is much brighter than originally predicted.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15  10 42.38   10 24.3   5.087   5.422   104   18.5  20:34 ( 43, 59)  
May  22  10 42.90   10 11.6   5.198   5.424    97   18.6  20:42 ( 55, 53)  

* C/2020 K5 ( PanSTARRS )

It was expected to brighten up to 13 mag from spring to summer. But actually, it is extremely faint as 19.0 mag (Mar. 22, A. C. Gilmore, P. M. Kilmartin). In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable until late August.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  15   1 14.18  -46 10.6   1.556   1.564    71   18.5   3:18 (308,-28)  
May  22   1 57.15  -45 11.8   1.552   1.549    70   18.6   3:11 (306,-32)  

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