Weekly Information about Bright Comets (2021 May 29: North)

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 Updated on June 1, 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  29  13 36.10   24 18.7   1.435   2.118   118   11.0  21:08 (  0, 79)  
June  5  13 36.75   21 32.9   1.456   2.100   115   11.0  20:55 ( 14, 76)

* 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  29  21 20.23   -9 27.4   0.458   1.234   107   11.7   3:05 (325, 39)  
June  5  21 48.08  -14  7.6   0.446   1.239   109   11.5   3:01 (326, 34)

* 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  29   1 40.51    2 13.9   2.133   1.570    43   12.4   3:05 (267, -1)  
June  5   1 58.40    3 26.1   2.129   1.602    46   12.5   3:01 (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  29   4 11.01   50 18.4   4.954   4.095    28   12.5   3:05 (209,  6)  
June  5   4 24.71   50  8.8   4.931   4.065    28   12.5   3:01 (211,  7)

* 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  29  18  3.21   43 29.3   5.821   6.256   110   12.8   1:38 (180, 82)  
June  5  17 57.26   43 34.4   5.743   6.199   112   12.7   1:04 (180, 81)

* 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 will be fading and getting lower rapidly after this. It will be unobservable at 17 mag in July. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  29  11  8.58   22 36.4   1.383   1.737    91   12.8  20:49 ( 75, 59)  
June  5  11  0.83   20 54.3   1.618   1.819    84   13.4  20:55 ( 81, 50)

* 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  29   0 35.96    7 19.9   2.284   1.920    56   13.2   3:05 (272, 16)  
June  5   0 52.49    8 47.0   2.198   1.885    58   13.0   3:01 (272, 18)

* 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 locates somewhat low in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  29  14 52.76  -24 41.3   2.411   3.377   159   13.0  22:23 (  0, 30)  
June  5  14 37.26  -22  0.2   2.475   3.385   148   13.1  21:40 (  0, 33)

* 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  29   0 14.23   -5 26.7   1.138   1.186    66   13.7   3:05 (286, 12)  
June  5   0 45.53   -1 32.1   1.108   1.136    64   13.0   3:01 (281, 13)

* 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  29  19 29.63  -28 45.9   2.082   2.910   137   13.6   3:04 (  0, 26)  
June  5  19 27.83  -29 36.5   2.031   2.917   144   13.6   2:35 (  0, 25)

* 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  29   3 43.99   27 39.4   6.876   5.883    10   14.0   3:05 (228, -8)  
June  5   3 50.14   27 57.9   6.860   5.885    14   14.0   3:01 (231, -5)

* 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  29   8 30.12  -25 41.8   5.386   5.239    76   14.1  20:49 ( 59, -1)  
June  5   8 36.04  -25  0.2   5.426   5.207    72   14.1  20:55 ( 63, -6)

* 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  29   3 15.84   45 12.6   2.495   1.661    27   14.6   3:05 (220,  9)  
June  5   3 43.22   44 38.6   2.436   1.590    26   14.3   3:01 (220,  8)

* 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  29  21 46.39  -79 54.9   3.086   3.603   112   14.5   3:05 (354,-26)  
June  5  22 10.39  -81 12.1   3.068   3.599   113   14.5   3:01 (354,-27)

* 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  29   2 45.38  -65  5.5   2.498   2.674    88   14.7   3:05 (329,-39)  
June  5   3 31.07  -66 58.6   2.474   2.686    90   14.7   3:01 (331,-41)

* 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  29  17 42.30   -1 21.6   4.221   5.139   152   14.7   1:18 (  0, 54)  
June  5  17 34.53   -2  4.5   4.177   5.126   157   14.7   0:42 (  0, 53)

* 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  29   4 50.33  -53 18.7   2.884   2.800    75   14.7  20:49 ( 47,-49)  
June  5   4 56.95  -52 48.6   2.948   2.864    75   14.8  20:55 ( 47,-53)

* 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  29  23 38.38  -35 28.1   4.272   4.360    88   14.8   3:05 (314, -1)  
June  5  23 40.92  -35  7.6   4.188   4.368    93   14.8   3:01 (317,  2)

* 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  29   6 35.04   29 59.4   2.545   1.752    30   15.0  20:49 (120,  9)  
June  5   6 55.22   28 40.0   2.669   1.841    28   15.3  20:55 (121,  6)

* 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  29   7 56.94   -2  4.6   2.412   2.051    57   15.0  20:49 ( 83,  7)  
June  5   8  9.74    0 39.8   2.474   2.029    52   15.0  20:55 ( 88,  4)

* 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  29  12 59.64   -0 10.2   2.889   3.580   126   15.3  20:49 (  8, 54)  
June  5  12 58.77   -0 25.6   2.957   3.565   119   15.3  20:55 ( 22, 52)

* 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  29  14 52.38   79 33.7   3.161   3.114    78   15.4  22:16 (180, 46)  
June  5  13 51.26   77 18.6   3.169   3.097    76   15.4  20:55 (180, 48)

* 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  29   4 11.61   23 18.2   2.228   1.218     3   15.5   3:05 (227,-15)  
June  5   4 40.02   24 36.0   2.234   1.223     3   15.6   3:01 (225,-15)

* C/2020 PV6 ( PanSTARRS )

Now it is 15.8 mag (May 25, ATLAS-HKO, Haleakala). It will brighten up to 14 mag in summer, and it will be observable in excellent condition. It locates somewhat low in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  29  21 52.32   12 54.3   2.400   2.642    92   15.8   3:05 (296, 51)  
June  5  21 42.88   15 34.4   2.242   2.605    99   15.6   3:01 (302, 59)

* 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  29  13 55.07   65 49.7   5.917   5.971    88   15.7  21:25 (180, 59)  
June  5  13 47.21   64 38.4   6.007   6.019    85   15.7  20:55 (179, 61)

* 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  29  13 43.62   -6 17.8   3.999   4.806   138   15.7  21:15 (  0, 49)  
June  5  13 41.13   -5  0.1   4.070   4.795   130   15.8  20:55 (  4, 50)

* 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  29  12 21.63  -20 29.8   4.110   4.752   124   15.8  20:49 ( 16, 33)  
June  5  12 16.11  -20 25.4   4.166   4.706   116   15.8  20:55 ( 26, 30)

* 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  29  17  2.56  -45 45.9   3.831   4.765   154   15.9   0:38 (  0,  9)  
June  5  16 54.28  -46  9.9   3.882   4.829   156   16.0   0:03 (  0,  9)

* 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  29  18 32.58   54 36.5   5.011   5.264    98   15.9   2:07 (180, 70)  
June  5  18 20.73   55 45.0   5.030   5.293    99   16.0   1:28 (180, 69)

* 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  29   2 11.84   26  5.7   3.029   2.214    30   16.0   3:05 (243,  7)  
June  5   2 26.43   27 43.6   3.011   2.232    33   16.1   3:01 (243, 10)

* C/2019 O3 ( Palomar )

Now it is 17.0-17.5 mag (May 18, Michael Jager). 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  29  19 34.96   47 40.4   8.626   8.832    98   16.3   3:05 (183, 77)  
June  5  19 30.97   48 30.0   8.592   8.835   100   16.3   2:38 (180, 76)

* 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  29  23 28.74   -7 28.8   2.119   2.146    77   16.6   3:05 (295, 20)  
June  5  23 41.23   -6 14.6   1.992   2.091    81   16.3   3:01 (296, 23)

* 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  29  17 47.62   50 30.8   6.358   6.701   105   16.4   1:22 (180, 75)  
June  5  17 38.44   50 49.2   6.305   6.656   105   16.3   0:46 (180, 74)

* 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  29  17  9.41  -24 45.5   3.916   4.914   168   16.4   0:45 (  0, 30)  
June  5  17  3.84  -23 34.5   3.893   4.907   177   16.4   0:12 (  0, 31)

* 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  29   0 11.75   16 24.1   3.375   2.987    59   16.4   3:05 (267, 25)  
June  5   0 15.38   17  8.0   3.372   3.078    64   16.5   3:01 (269, 30)

* 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  29  23 19.50   44 13.6   6.331   5.978    65   16.4   3:05 (240, 46)  
June  5  23 18.75   44 30.2   6.258   5.983    69   16.4   3:01 (240, 50)

* 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  29  16 32.58  -17 24.5   3.901   4.912   175   16.4   0:08 (  0, 38)  
June  5  16 22.02  -17 53.0   3.924   4.930   171   16.5  23:25 (  0, 37)

* C/2021 K1 ( ATLAS )

Now it is 16.2 mag (May 24, ATLAS-HKO, Haleakala). It stays 16.5 mag until August and stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  29  23 48.84   -4 49.1   2.628   2.509    72   16.5   3:05 (289, 18)  
June  5  23 59.89   -4 24.5   2.560   2.517    76   16.5   3:01 (291, 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  29  10 44.37   57 41.4   3.619   3.490    74   16.7  20:49 (143, 56)  
June  5  10 37.85   56 26.8   3.627   3.407    69   16.6  20:55 (138, 51)

* 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  29   1 36.12   -3 11.5   2.266   1.753    47   16.9   3:05 (272, -3)  
June  5   1 53.46   -1  2.0   2.198   1.719    49   16.7   3:01 (271,  0)

* 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  29  22 32.85   -6 16.0   2.186   2.410    90   16.8   3:05 (305, 31)  
June  5  22 41.53   -5 49.0   2.092   2.396    94   16.7   3:01 (307, 33)

* 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  29  12 11.25    0 57.1   1.819   2.423   114   16.7  20:49 ( 28, 52)  
June  5  11 58.92   -1  6.6   1.960   2.442   105   16.9  20:55 ( 42, 45)

* 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  29  12  8.55   38 51.8   7.021   7.184    95   16.8  20:49 (110, 76)  
June  5  12  5.87   38 40.8   7.069   7.132    89   16.8  20:55 (107, 69)

* 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  29  15 19.81  -14  7.7   1.141   2.131   163   17.2  22:51 (  0, 41)  
June  5  15 14.49  -13 40.2   1.133   2.098   155   17.0  22:18 (  0, 41)

* 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  29   3 22.78  -42 46.5   5.668   5.334    65   17.0   3:05 (299,-42)  
June  5   3 27.36  -43 19.1   5.569   5.285    68   17.0   3:01 (301,-39)

* 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  29  16 39.28   17 25.0   0.928   1.830   140   17.2   0:14 (  0, 72)  
June  5  16 33.36   17 50.3   0.886   1.783   139   17.0  23:36 (  0, 73)

* 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  29  17 52.17  -14  3.8   6.707   7.653   157   17.0   1:27 (  0, 41)  
June  5  17 46.58  -13 42.2   6.697   7.678   164   17.0   0:54 (  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  29  12 10.92    4 19.7   1.569   2.177   113   17.0  20:49 ( 30, 55)  
June  5  12 14.11    2 45.4   1.630   2.168   107   17.1  20:55 ( 40, 51)

* 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  29  21  9.25   56 45.2   3.849   3.835    81   17.5   3:05 (210, 63)  
June  5  21  5.21   59 27.5   3.778   3.793    83   17.4   3:01 (200, 63)

* 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  29  23 48.26    2 29.2   1.754   1.687    69   17.5   3:05 (283, 22)  
June  5   0  4.22    4 52.2   1.701   1.680    71   17.4   3:01 (282, 25)

* 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  29  10 27.01   13 53.8   2.872   2.976    85   17.5  20:49 ( 72, 46)  
June  5  10 31.36   13 24.3   2.931   2.935    80   17.5  20:55 ( 77, 40)

* 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  29  18 29.82   46 27.6   6.622   6.973   106   17.5   2:04 (180, 79)  
June  5  18 24.57   46 32.9   6.547   6.925   107   17.5   1:32 (180, 78)

* C/2020 F2 ( ATLAS )

Now it is 17.3 mag (May 3, Michael Jager). 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  29  14 46.53   -7 31.3   8.223   9.136   152   17.5  22:18 (  0, 47)  
June  5  14 42.37   -7  9.2   8.273   9.125   145   17.5  21:46 (  0, 48)

* 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  29   8 17.64   -8 18.4   5.831   5.477    64   17.6  20:49 ( 74,  7)  
June  5   8 19.22   -8 38.9   5.909   5.465    59   17.6  20:55 ( 79,  1)

* 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  29  13 20.23    3 32.2   2.598   3.327   128   17.7  20:52 (  0, 58)  
June  5  13 19.28    3  9.4   2.661   3.314   122   17.7  20:55 ( 15, 57)

* 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  29   3  6.11   64 20.5   2.839   2.234    44   17.8   3:05 (205, 22)  
June  5   3 27.02   67 26.1   2.787   2.220    46   17.7   3:01 (203, 24)

* 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  29  13 24.01   17 46.6   1.470   2.174   121   17.7  20:56 (  0, 73)  
June  5  13 28.15   16 27.0   1.566   2.216   116   18.0  20:55 ( 17, 71)

* 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  29   8 17.20   -4 44.4   1.947   1.740    63   17.7  20:49 ( 77, 10)  
June  5   8 36.27   -6 24.2   2.043   1.805    62   18.0  20:55 ( 78,  6)

* 193P/LINEAR-NEAT

Now it is 19 mag (May 28, Giuseppe Pappa). 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  29  22 49.69  -12 27.6   2.048   2.261    88   17.9   3:05 (306, 23)  
June  5  22 58.66  -11 14.5   1.958   2.247    92   17.8   3:01 (308, 27)

* 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  29  20 54.49   36 56.4   4.460   4.632    93   17.9   3:05 (257, 73)  
June  5  20 50.25   37 26.1   4.318   4.570    97   17.8   3:01 (253, 78)

* 99P/Kowal 1

Now it is 17.9 mag (May 1, ATLAS-HKO, Haleakala). 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  29  10 41.55   11 15.4   4.747   4.856    90   17.8  20:49 ( 66, 47)  
June  5  10 44.18   10 53.0   4.847   4.850    84   17.8  20:55 ( 72, 41)

* 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  29   0 44.21   16 37.2   8.406   7.818    51   17.8   3:05 (262, 19)  
June  5   0 46.04   17 12.2   8.358   7.861    57   17.8   3:01 (265, 24)

* 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  29  12 54.69  -13  7.8   6.376   7.068   129   17.8  20:49 (  7, 41)  
June  5  12 54.68  -12 41.0   6.481   7.084   122   17.9  20:55 ( 18, 40)

* 108P/Ciffreo

It has not been observed yet in this apparition. It will brighten rapidly up to 15 mag in autumn. 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)  
May  29   1 11.37   -1  1.2   2.396   1.943    51   18.1   3:05 (274,  3)  
June  5   1 27.06    0 43.0   2.316   1.910    54   17.8   3:01 (273,  6)

* (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  29   1 28.29    8 52.8   2.406   1.817    43   17.9   3:05 (263,  6)  
June  5   1 42.78    9 48.9   2.408   1.868    46   18.0   3:01 (264,  8)

* C/2016 Q2 ( PanSTARRS )

Now it is 18.6 mag (May 14, Michael Jager). 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  29  17 21.84   55 40.7   6.807   7.083   101   17.9   0:57 (180, 69)  
June  5  17 11.43   56  6.2   6.815   7.084   101   17.9   0:19 (180, 69)

* 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  29   2 36.99  -43 35.6   1.565   1.539    69   18.7   3:05 (303,-34)  
June  5   3 12.72  -41 34.0   1.593   1.536    68   18.8   3:01 (300,-36)

* 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  29  10 43.96    9 56.0   5.311   5.426    91   18.7  20:49 ( 64, 47)  
June  5  10 45.53    9 37.8   5.423   5.428    84   18.8  20:55 ( 70, 41)

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