Weekly Information about Bright Comets (2021 May 22: North)

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Updated on May 26, 2021
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Best time and the azimuth, altitude (A,h) are at lat. 35 deg in the Northern Hemisphere.
Azimuth indicates 0 for south, 90 for west, 180 for north, 270 for east.

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* C/2020 T2 ( Palomar )

It brightened rapidly. Now it is very bright as 10.9 mag (May 17, 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  22  13 36.79   26 49.7   1.422   2.140   122   11.1  21:36 (  0, 82)  
May  29  13 36.10   24 18.7   1.435   2.118   118   11.0  21:08 (  0, 79)  

* 7P/Pons-Winnecke

Now it is bright as 12.0 mag (May 18, Michael Jager). 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  22  20 52.21   -5 12.3   0.478   1.236   106   11.9   3:11 (324, 43)  
May  29  21 20.23   -9 27.4   0.458   1.234   107   11.7   3:05 (325, 39)  

* 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 12.4 mag (May 17, Chris Wyatt). 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  22  11 22.06   24 43.3   1.148   1.656    99   12.1  20:42 ( 65, 69)  
May  29  11  8.58   22 36.4   1.383   1.737    91   12.8  20:49 ( 75, 59)  

* 10P/Tempel 2

Now it is 11.2 mag (Apr. 19, Chris Wyatt). In the Southern Hemisphere, it is observable in the morning sky. 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  22   1 22.02    0 55.4   2.135   1.540    42   12.2   3:11 (267, -2)  
May  29   1 40.51    2 13.9   2.133   1.570    43   12.4   3:05 (267, -1)  

* C/2019 L3 ( ATLAS )

Now it is 12.8 mag (May 7, 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  22   3 57.30   50 26.4   4.970   4.126    30   12.6  20:42 (151,  6)  
May  29   4 11.01   50 18.4   4.954   4.095    28   12.5   3:05 (209,  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  22  18  8.67   43 16.5   5.906   6.314   109   12.9   2:11 (180, 82)  
May  29  18  3.21   43 29.3   5.821   6.256   110   12.8   1:38 (180, 82)  

* C/2020 J1 ( SONEAR )

Now it is bright as 12.6 mag (May 19, Chris Wyatt). 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  22  15 10.15  -27 21.9   2.374   3.370   167   13.0  23:08 (  0, 28)  
May  29  14 52.76  -24 41.3   2.411   3.377   159   13.0  22:23 (  0, 30)  

* 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  22   0 19.83    5 51.7   2.371   1.956    54   13.5   3:11 (272, 13)  
May  29   0 35.96    7 19.9   2.284   1.920    56   13.2   3:05 (272, 16)  

* 246P/NEAT

Now it is 13.9 mag (May 13, Taras Prystavski). 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  22  19 30.20  -27 58.1   2.141   2.904   130   13.6   3:11 (355, 27)  
May  29  19 29.63  -28 45.9   2.082   2.910   137   13.6   3:04 (  0, 26)  

* 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  22  23 43.67   -9  7.1   1.182   1.241    68   14.4   3:11 (290, 12)  
May  29   0 14.23   -5 26.7   1.138   1.186    66   13.7   3:05 (286, 12)  

* 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  22   3 37.82   27 20.7   6.882   5.882     8   14.0   3:11 (226,-10)  
May  29   3 43.99   27 39.4   6.876   5.883    10   14.0   3:05 (228, -8)  

* C/2019 T4 ( ATLAS )

Now it is 13.5 mag (May 17, 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  22   8 24.58  -26 27.7   5.345   5.271    80   14.1  20:42 ( 54,  3)  
May  29   8 30.12  -25 41.8   5.386   5.239    76   14.1  20:49 ( 59, -1)  

* C/2019 F1 ( ATLAS-Africano )

Now it is 14.5 mag (May 17, 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  22  21 23.52  -78 31.5   3.112   3.607   111   14.5   3:11 (353,-25)  
May  29  21 46.39  -79 54.9   3.086   3.603   112   14.5   3:05 (354,-26)  

* 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  22   4 43.39  -54  4.5   2.816   2.737    75   14.6  20:42 ( 46,-45)  
May  29   4 50.33  -53 18.7   2.884   2.800    75   14.7  20:49 ( 47,-49)  

* 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  22   6 12.84   31 14.8   2.422   1.664    32   14.6  20:42 (120, 12)  
May  29   6 35.04   29 59.4   2.545   1.752    30   15.0  20:49 (120,  9)  

* 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  22   2 48.98   45 26.9   2.553   1.733    28   15.0   3:11 (220, 10)  
May  29   3 15.84   45 12.6   2.495   1.661    27   14.6   3:05 (220,  9)  

* 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  22   2  6.36  -62 47.8   2.539   2.665    85   14.7   3:11 (326,-37)  
May  29   2 45.38  -65  5.5   2.498   2.674    88   14.7   3:05 (329,-39)  

* C/2018 U1 ( Lemmon )

Now it is 15.1 mag (May 19, Chris Wyatt). 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  22  17 49.63   -0 43.5   4.283   5.152   145   14.8   1:52 (  0, 54)  
May  29  17 42.30   -1 21.6   4.221   5.139   152   14.7   1:18 (  0, 54)  

* C/2020 F5 ( MASTER )

Now it is 15.1 mag (May 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  22  23 35.13  -35 52.8   4.356   4.353    83   14.9   3:11 (312, -4)  
May  29  23 38.38  -35 28.1   4.272   4.360    88   14.8   3:05 (314, -1)  

* C/2021 A7 ( NEOWISE )

Now it is 14.5 mag (Apr. 29, Thomas Lehmann). 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  22   7 44.34   -5  4.0   2.354   2.076    61   15.0  20:42 ( 77, 10)  
May  29   7 56.94   -2  4.6   2.412   2.051    57   15.0  20:49 ( 83,  7)  

* 117P/Helin-Roman-Alu 1

Now it is 15.0 mag (May 17, Chris Wyatt). 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  22  13  1.36   -0  0.2   2.828   3.595   132   15.3  21:00 (  0, 55)  
May  29  12 59.64   -0 10.2   2.889   3.580   126   15.3  20:49 (  8, 54)  

* 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  22  16 17.20   80 31.6   3.163   3.133    79   15.4   0:22 (180, 45)  
May  29  14 52.38   79 33.7   3.161   3.114    78   15.4  22:16 (180, 46)  

* 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  22   3 43.72   21 41.7   2.229   1.219     2   15.5   3:11 (229,-15)  
May  29   4 11.61   23 18.2   2.228   1.218     3   15.5   3:05 (227,-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  22  14  4.69   66 54.4   5.829   5.923    90   15.6  22:02 (180, 58)  
May  29  13 55.07   65 49.7   5.917   5.971    88   15.7  21:25 (180, 59)  

* 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  22  13 46.70   -7 41.4   3.941   4.818   146   15.7  21:46 (  0, 47)  
May  29  13 43.62   -6 17.8   3.999   4.806   138   15.7  21:15 (  0, 49)  

* 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  22  17 10.71  -45 13.9   3.794   4.702   150   15.8   1:14 (  0, 10)  
May  29  17  2.56  -45 45.9   3.831   4.765   154   15.9   0:38 (  0,  9)  

* C/2020 Y2 ( ATLAS )

Now it is 15.9 mag (Apr. 29, ATLAS-HKO, Haleakala). 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  22  12 27.98  -20 35.6   4.063   4.797   131   15.9  20:42 (  4, 34)  
May  29  12 21.63  -20 29.8   4.110   4.752   124   15.8  20:49 ( 16, 33)  

* 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  22  18 43.28   53 15.4   4.999   5.236    97   15.9   2:45 (180, 72)  
May  29  18 32.58   54 36.5   5.011   5.264    98   15.9   2:07 (180, 70)  

* 17P/Holmes

Now it is 15.1 mag (May 24, Mike Olason). 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  22   1 57.29   24 23.6   3.045   2.196    27   15.9   3:11 (243,  5)  
May  29   2 11.84   26  5.7   3.029   2.214    30   16.0   3:05 (243,  7)  

* C/2020 S3 ( Erasmus )

It brightened up to 3 mag in December in the SOHO spacecraft images (Dec. 18, Hirohisa Sato). Now it is 15 mag (May 20, Mike Olason). It stays observable in good condition after this while the comet will be fading.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  22   0  7.36   15 36.7   3.371   2.895    54   16.3   3:11 (265, 21)  
May  29   0 11.75   16 24.1   3.375   2.987    59   16.4   3:05 (267, 25)  

* 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  22  19 38.41   46 46.9   8.664   8.830    96   16.3   3:11 (203, 77)  
May  29  19 34.96   47 40.4   8.626   8.832    98   16.3   3:05 (183, 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  22  17 14.82  -25 54.0   3.955   4.923   160   16.4   1:18 (  0, 29)  
May  29  17  9.41  -24 45.5   3.916   4.914   168   16.4   0:45 (  0, 30)  

* 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  22  17 56.23   50  3.4   6.417   6.745   104   16.5   1:58 (180, 75)  
May  29  17 47.62   50 30.8   6.358   6.701   105   16.4   1:22 (180, 75)  

* C/2017 Y2 ( PanSTARRS )

Now it is 16.4 mag (May 1, 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  22  16 43.12  -16 54.7   3.899   4.894   168   16.4   0:46 (  0, 38)  
May  29  16 32.58  -17 24.5   3.901   4.912   175   16.4   0:08 (  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  22  23 19.61   43 56.5   6.399   5.973    60   16.4   3:11 (239, 42)  
May  29  23 19.50   44 13.6   6.331   5.978    65   16.4   3:05 (240, 46)  

* 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  22  12 27.03    3 10.3   1.691   2.408   123   16.5  20:42 (  8, 58)  
May  29  12 11.25    0 57.1   1.819   2.423   114   16.7  20:49 ( 28, 52)  

* 67P/Churyumov-Gerasimenko

Now it is 17.2 mag (May 24, Mike Olason). 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  22  23 16.45   -8 41.0   2.248   2.201    74   16.9   3:11 (294, 17)  
May  29  23 28.74   -7 28.8   2.119   2.146    77   16.6   3:05 (295, 20)  

* C/2021 A1 ( Leonard )

Now it is 17.4 mag (May 17, Michael Jager). 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. Actually, it is somewhat fainter than this ephemeris recently.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  22  10 52.92   58 51.2   3.608   3.572    79   16.8  20:42 (151, 60)  
May  29  10 44.37   57 41.4   3.619   3.490    74   16.7  20:49 (143, 56)  

* 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  22   7 50.38   35 30.0   2.801   2.343    53   16.8  20:42 (113, 32)  
May  29   8  5.55   34 31.4   2.913   2.393    50   17.0  20:49 (114, 28)  

* C/2020 V2 ( ZTF )

Now it is 16.7 mag (May 5, Taras Prystavski). 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  22  12 11.78   38 59.0   6.975   7.237   101   16.8  20:42 (124, 83)  
May  29  12  8.55   38 51.8   7.021   7.184    95   16.8  20:49 (110, 76)  

* 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  22  22 23.66   -6 47.4   2.282   2.425    85   17.0   3:11 (302, 28)  
May  29  22 32.85   -6 16.0   2.186   2.410    90   16.8   3:05 (305, 31)  

* 106P/Schuster

Now it is 17.8 mag (May 19, Filipp Romanov). 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  22   1 19.06   -5 19.0   2.336   1.788    46   17.2   3:11 (273, -5)  
May  29   1 36.12   -3 11.5   2.266   1.753    47   16.9   3:05 (272, -3)  

* 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  22  17 57.57  -14 25.8   6.734   7.629   150   17.0   2:00 (  0, 41)  
May  29  17 52.17  -14  3.8   6.707   7.653   157   17.0   1:27 (  0, 41)  

* 413P/2020 W4 ( Larson )

First return of a new periodic comet which brightened up to 16 mag in 2014. Now it is 16.9 mag (May 5, Taras Prystavski). 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  22  12  9.07    5 50.0   1.512   2.187   118   17.0  20:42 ( 17, 60)  
May  29  12 10.92    4 19.7   1.569   2.177   113   17.0  20:49 ( 30, 55)  

* 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  22   3 18.25  -42 21.7   5.762   5.383    63   17.1   3:11 (297,-45)  
May  29   3 22.78  -42 46.5   5.668   5.334    65   17.0   3:05 (299,-42)  

* 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  22  16 44.40   16 36.0   0.979   1.877   141   17.3   0:47 (  0, 72)  
May  29  16 39.28   17 25.0   0.928   1.830   140   17.2   0:14 (  0, 72)  

* 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  22  15 25.66  -14 39.1   1.160   2.166   171   17.4  23:24 (  0, 40)  
May  29  15 19.81  -14  7.7   1.141   2.131   163   17.2  22:51 (  0, 41)  

* 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 17.1 mag (May 7, 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  22  13 20.70   18 59.3   1.380   2.133   125   17.4  21:20 (  0, 74)  
May  29  13 24.01   17 46.6   1.470   2.174   121   17.7  20:56 (  0, 73)  

* 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  22  21 11.40   54  3.5   3.926   3.877    79   17.6   3:11 (219, 61)  
May  29  21  9.25   56 45.2   3.849   3.835    81   17.5   3:05 (210, 63)  

* 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  22  14 50.89   -7 54.9   8.188   9.146   160   17.5  22:50 (  0, 47)  
May  29  14 46.53   -7 31.3   8.223   9.136   152   17.5  22:18 (  0, 47)  

* 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  22  23 32.10    0  6.6   1.808   1.697    67   17.6   3:11 (284, 20)  
May  29  23 48.26    2 29.2   1.754   1.687    69   17.5   3:05 (283, 22)  

* 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  22  10 23.52   14 18.4   2.812   3.015    91   17.6  20:42 ( 65, 52)  
May  29  10 27.01   13 53.8   2.872   2.976    85   17.5  20:49 ( 72, 46)  

* 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  22  18 34.58   46 15.7   6.703   7.021   104   17.6   2:37 (180, 79)  
May  29  18 29.82   46 27.6   6.622   6.973   106   17.5   2:04 (180, 79)  

* 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  22   7 57.44   -3  0.9   1.857   1.678    63   17.5  20:42 ( 76, 14)  
May  29   8 17.20   -4 44.4   1.947   1.740    63   17.7  20:49 ( 77, 10)  

* 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  22   8 16.47   -8  1.0   5.748   5.489    70   17.6  20:42 ( 69, 14)  
May  29   8 17.64   -8 18.4   5.831   5.477    64   17.6  20:49 ( 74,  7)  

* 152P/Helin-Lawrence

Now it is 17.4 mag (May 2, ATLAS-MLO, Mauna Loa). 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  22  13 22.05    3 48.6   2.543   3.341   135   17.6  21:21 (  0, 59)  
May  29  13 20.23    3 32.2   2.598   3.327   128   17.7  20:52 (  0, 58)  

* 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  22   2 49.32   61 22.4   2.889   2.251    42   17.8   3:11 (207, 20)  
May  29   3  6.11   64 20.5   2.839   2.234    44   17.8   3:05 (205, 22)  

* 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  22  12 55.08  -13 37.2   6.281   7.051   136   17.8  20:54 (  0, 41)  
May  29  12 54.69  -13  7.8   6.376   7.068   129   17.8  20:49 (  7, 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  22  10 39.44   11 34.7   4.648   4.862    96   17.8  20:42 ( 57, 53)  
May  29  10 41.55   11 15.4   4.747   4.856    90   17.8  20:49 ( 66, 47)  

* 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  22   0 42.11   16  1.3   8.447   7.775    45   17.8   3:11 (260, 14)  
May  29   0 44.21   16 37.2   8.406   7.818    51   17.8   3:05 (262, 19)  

* (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  22   1 13.12    7 50.0   2.400   1.766    41   17.8   3:11 (263,  4)  
May  29   1 28.29    8 52.8   2.406   1.817    43   17.9   3:05 (263,  6)  

* C/2021 E3 ( ZTF )

Now it is 18.6 mag (May 5, F. B. Zoltowski). It is expected to brighten up to 11 mag from spring to summer in 2022. In the Southen Hemisphere, it locates somewhat low in 2021, but it will be observable in good condition at the high light for a long time. In the Northern Hemisphere, it is observable in good condition in 2021, 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  22  20 57.66   36 23.0   4.604   4.694    88   18.0   3:11 (258, 68)  
May  29  20 54.49   36 56.4   4.460   4.632    93   17.9   3:05 (257, 73)  

* 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  22  17 31.79   55  5.2   6.806   7.082   101   17.9   1:34 (180, 70)  
May  29  17 21.84   55 40.7   6.807   7.083   101   17.9   0:57 (180, 69)  

* 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  22   8 33.36   38 59.6   3.367   3.024    61   17.9  20:42 (114, 41)  
May  29   8 44.48   38  8.3   3.513   3.095    57   18.2  20:49 (115, 37)  

* 193P/LINEAR-NEAT

It has not been observed yet in this apparition. It will brighten up to 15-16 mag in autumn and it will be observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  22  22 40.10  -13 41.1   2.138   2.276    84   18.1   3:11 (304, 20)  
May  29  22 49.69  -12 27.6   2.048   2.261    88   17.9   3:05 (306, 23)  

* 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  22   1 57.15  -45 11.8   1.552   1.549    70   18.6   3:11 (306,-32)  
May  29   2 36.99  -43 35.6   1.565   1.539    69   18.7   3:05 (303,-34)  

* 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  22  10 42.90   10 11.6   5.198   5.424    97   18.6  20:42 ( 55, 53)  
May  29  10 43.96    9 56.0   5.311   5.426    91   18.7  20:49 ( 64, 47)  

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