Weekly Information about Bright Comets (2021 Apr. 24: North)

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Updated on April 25, 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 R4 ( ATLAS )

Now it is very bright as 9.2 mag (Apr. 21, Carlos Labordena). It stays observable at 9 mag in excellent condition in April.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 24  16  4.21   29  9.8   0.464   1.348   129    8.8   2:02 (  0, 84)  
May   1  13 53.40   33 13.4   0.540   1.421   130    9.5  23:06 (  0, 88)  

* C/2020 T2 ( Palomar )

It brightened rapidly. Now it is very bright as 11.1 mag (Apr. 21, Osamu Miyazaki). 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)  
Apr. 24  13 50.36   33 27.6   1.440   2.254   133   11.4  23:39 (  0, 88)  
May   1  13 45.87   32 23.3   1.424   2.222   131   11.3  23:07 (  0, 87)  

* 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)  
Apr. 24   0  2.34   -5  6.8   2.144   1.449    35   11.8   3:46 (273, -5)  
May   1   0 23.09   -3 30.9   2.141   1.468    37   11.9   3:36 (271, -4)  

* C/2019 L3 ( ATLAS )

Now it is 12.9 mag (Apr. 4, 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)  
Apr. 24   3  2.93   50 49.1   4.980   4.256    39   12.8  20:10 (142, 16)  
May   1   3 16.37   50 44.2   4.986   4.223    36   12.7  20:18 (144, 13)  

* 7P/Pons-Winnecke

Now it is 13.1 mag (Apr. 22, Michael Jager). Brightenening very rapidly. It will brighten up to 11 mag from May to 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)  
Apr. 24  19  6.49    5 53.4   0.626   1.300   103   13.2   3:46 (326, 57)  
May   1  19 31.54    4  0.3   0.580   1.275   103   12.8   3:36 (325, 54)  

* C/2017 K2 ( PanSTARRS )

Now it is 13.2 mag (Apr. 21, Toshihiko Ikemura, Hirohisa Sato). 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)  
Apr. 24  18 24.06   41 27.2   6.297   6.542    99   13.2   3:46 (221, 81)  
May   1  18 21.28   42  1.0   6.192   6.485   102   13.1   3:36 (195, 83)  

* C/2019 F1 ( ATLAS-Africano )

Now it is 14.9 mag (Apr. 19, Chris Wyatt). It is expected to brighten up to 13 mag from spring to summer. But actually, it is fainter than this ephemeris recently. 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)  
Apr. 24  20  3.16  -72 10.9   3.286   3.637   102   13.2   3:46 (350,-19)  
May   1  20 21.74  -73 51.2   3.232   3.628   105   13.1   3:36 (351,-21)  

* 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 12.6 mag (Apr. 4, Sandor Szabo). 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)  
Apr. 24   4 18.54   34 19.3   1.974   1.317    36   13.2  20:10 (119, 19)  
May   1   4 51.34   34  1.6   2.075   1.401    36   13.5  20:18 (119, 18)  

* 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 14.2 mag (Apr. 12, 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)  
Apr. 24   4 12.70  -60  5.3   2.511   2.489    77   13.4  20:10 ( 36,-31)  
May   1   4 20.81  -58  6.1   2.591   2.550    76   13.5  20:18 ( 39,-34)  

* C/2020 K5 ( PanSTARRS )

It was expected to brighten up to 13 mag from spring to summer. But actually, now 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)  
Apr. 24  23  5.11  -44 40.4   1.678   1.644    70   13.8   3:46 (314,-16)  
May   1  23 46.19  -45 52.2   1.619   1.613    71   13.6   3:36 (312,-20)  

* C/2020 J1 ( SONEAR )

Now it is 12.9 mag (Apr. 19, Chris Wyatt). It stays 13-14 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)  
Apr. 24  16 27.18  -35 43.5   2.515   3.356   140   13.8   2:21 (  0, 19)  
May   1  16  8.33  -34  8.7   2.439   3.357   151   13.7   1:35 (  0, 21)  

* 246P/NEAT

Now it is 14.4 mag (Apr. 19, Chris Wyatt). 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)  
Apr. 24  19 20.55  -25 27.1   2.445   2.883   105   13.8   3:46 (338, 26)  
May   1  19 24.65  -25 58.5   2.361   2.887   111   13.7   3:36 (341, 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)  
Apr. 24   3 13.41   26  5.3   6.804   5.874    20   13.9  20:10 (121,  2)  
May   1   3 19.41   26 23.9   6.839   5.876    15   13.9  20:18 (125, -2)  

* C/2019 T4 ( ATLAS )

Now it is 14.1 mag (Apr. 12, 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 observable in the low sky until May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 24   8  7.13  -30 10.3   5.196   5.405    96   14.3  20:10 ( 30, 18)  
May   1   8 10.70  -29  9.8   5.230   5.371    92   14.2  20:18 ( 37, 15)  

* 4P/Faye

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)  
Apr. 24  23 18.71    0  2.8   2.727   2.112    43   14.5   3:46 (275,  7)  
May   1  23 33.53    1 28.3   2.637   2.072    46   14.2   3:36 (274,  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)  
Apr. 24   0 21.21  -52 54.0   2.826   2.646    69   14.9   3:46 (315,-31)  
May   1   0 41.84  -55 15.2   2.741   2.648    74   14.8   3:36 (318,-32)  

* C/2018 U1 ( Lemmon )

Now it is 14.9 mag (Apr. 18, Toshihiko Ikemura, Hirohisa Sato). 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)  
Apr. 24  18 12.40    1  2.4   4.669   5.208   117   15.0   3:46 (351, 56)  
May   1  18  7.84    0 42.2   4.555   5.193   124   14.9   3:33 (  0, 56)  

* 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)  
Apr. 24  23 15.79  -38 13.8   4.667   4.333    64   15.0   3:46 (307,-14)  
May   1  23 21.49  -37 32.3   4.594   4.337    69   15.0   3:36 (308,-12)  

* 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)  
Apr. 24   6 56.90  -19 27.9   2.175   2.207    78   15.1  20:10 ( 50, 17)  
May   1   7  8.18  -15 31.9   2.209   2.170    74   15.1  20:18 ( 57, 16)  

* 117P/Helin-Roman-Alu 1

Now it is 14.9 mag (Apr. 18, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 13 mag in 2022. In 2021, it is observable at 15-16 mag in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 24  13 15.35   -0 14.1   2.686   3.657   162   15.3  23:04 (  0, 55)  
May   1  13 11.01   -0  3.1   2.704   3.641   154   15.3  22:32 (  0, 55)  

* C/2021 A4 ( NEOWISE )

It brightening very rapidly up to 12.5 mag in early February (Feb. 8, Michael Jager). Now it is fading. It has already faded down to 14.9 mag (Apr. 12, Chris Wyatt). In the Southern Hemisphere, it stays observable after this while the comet will be fading. It is not observable after this in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 24   4 13.85  -13 48.9   1.838   1.270    41   15.5  20:10 ( 80, -9)  
May   1   4 15.24  -15 27.5   1.929   1.320    39   16.3  20:18 ( 83,-17)  

* 17P/Holmes

Now it is 15.8 mag (Jan. 16, Slooh.com Canary Islands Observatory). It is not observable until June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 24   0 59.74   16 59.8   3.081   2.137    16   15.5   3:46 (247, -3)  
May   1   1 14.06   18 55.6   3.076   2.150    19   15.6   3:36 (246, -1)  

* 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)  
Apr. 24  17 37.04  -42  0.5   3.781   4.446   125   15.5   3:30 (  0, 13)  
May   1  17 31.79  -42 56.6   3.766   4.510   132   15.6   2:57 (  0, 12)  

* 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)  
Apr. 24  23 42.65   11 54.5   3.271   2.514    35   15.6   3:46 (262,  9)  
May   1  23 49.87   12 54.7   3.309   2.612    39   15.8   3:36 (262, 12)  

* C/2020 M5 ( ATLAS )

Now it is 16.1 mag (Apr. 20, Toshihiko Ikemura, Hirohisa Sato). 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)  
Apr. 24  19 51.50   72 14.6   3.259   3.222    78   15.7   3:46 (193, 50)  
May   1  19 27.58   75 12.5   3.223   3.198    79   15.6   3:36 (187, 49)  

* 88P/Howell

It brightened up to 8.2 mag in autumn (Oct. 13, Chris Wyatt). It faded down to 13.0 mag in February (Feb. 14, Sandor Szabo). It is not observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 24   2 14.10   12 18.6   3.443   2.438     2   15.6  20:10 (119,-17)  
May   1   2 26.21   13 24.6   3.490   2.483     2   15.8   3:36 (238,-18)  

* C/2019 K7 ( Smith )

Now it is 16.1 mag (Apr. 20, Toshihiko Ikemura, Hirohisa Sato). It stays 15-16 mag until June. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it will be observable in the extremely low sky only in next spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 24  19 12.51   46 23.3   5.030   5.125    89   15.7   3:46 (227, 71)  
May   1  19  7.24   48 15.4   5.012   5.152    92   15.8   3:36 (214, 73)  

* 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 14.9 mag (Apr. 4, Sandor Szabo). 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)  
Apr. 24   6 43.83   38 51.0   2.342   2.142    66   15.7  20:10 (112, 47)  
May   1   7  1.38   38  7.0   2.458   2.192    62   16.0  20:18 (112, 44)  

* 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)  
Apr. 24   2  0.51   12 58.9   2.288   1.283     1   15.9   3:46 (240,-17)  
May   1   2 24.88   15 24.3   2.265   1.258     1   15.8   3:36 (237,-16)  

* 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)  
Apr. 24  12 59.82  -20 54.7   4.015   4.982   162   16.0  22:48 (  0, 34)  
May   1  12 51.17  -20 52.6   4.002   4.935   155   15.9  22:12 (  0, 34)  

* C/2020 H6 ( ATLAS )

Now it is 15.7 mag (Apr. 4, Michael Jager). 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)  
Apr. 24  14  3.17  -13 52.3   3.865   4.870   178   16.3  23:52 (  0, 41)  
May   1  13 58.66  -12 17.2   3.858   4.856   171   16.3  23:20 (  0, 43)  

* 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)  
Apr. 24  14 59.11   69 33.7   5.518   5.731    97   16.3   0:52 (180, 56)  
May   1  14 43.67   69 11.8   5.590   5.779    95   16.4   0:09 (180, 56)  

* C/2020 S8 ( Lemmon )

Now it is 15.5 mag (Apr. 5, Sandor Szabo). It stays observable at 16 mag in good condition from April to May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 24  14  7.11   12 21.0   1.419   2.368   154   16.4   0:02 (  0, 67)  
May   1  13 37.52   10 16.2   1.441   2.374   151   16.4  22:57 (  0, 65)  

* 15P/Finlay

Now it is 17-17.5 mag (Apr. 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)  
Apr. 24  21 51.67  -20 14.4   1.477   1.487    70   17.1   3:46 (305, 11)  
May   1  22 17.96  -18  1.9   1.388   1.423    70   16.4   3:36 (301, 11)  

* C/2021 A2 ( NEOWISE )

It brightened up to 10.5 mag in early February (Feb. 6, Marco Goiato). Now it is fading rapidly. It has already faded down to 16.6 mag (Apr. 11, Toshihiko Ikemura, Hirohisa Sato). In the Northern Hemisphere, it stays observable for a long time after this. In the Southern Heimsphere, it will never be observable again.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 24   5 11.11   53 47.2   2.300   1.906    54   16.4  20:10 (136, 35)  
May   1   5 17.39   55  4.3   2.440   1.970    51   16.8  20:18 (138, 31)  

* C/2017 Y2 ( PanSTARRS )

Now it is 17.1 mag (Apr. 20, Toshihiko Ikemura, Hirohisa Sato). 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)  
Apr. 24  17 20.51  -14 49.6   4.086   4.827   132   16.4   3:13 (  0, 40)  
May   1  17 12.27  -15 20.8   4.013   4.843   141   16.4   2:38 (  0, 40)  

* 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)  
Apr. 24  23 14.44   42 56.3   6.589   5.958    47   16.5   3:46 (236, 30)  
May   1  23 16.47   43  9.1   6.554   5.961    50   16.5   3:36 (237, 32)  

* 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)  
Apr. 24  17 31.95  -29 52.1   4.260   4.961   129   16.6   3:25 (  0, 25)  
May   1  17 28.59  -28 58.6   4.165   4.951   137   16.5   2:54 (  0, 26)  

* 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)  
Apr. 24  19 46.58   42 47.0   8.857   8.824    84   16.7   3:46 (242, 67)  
May   1  19 45.38   43 49.4   8.804   8.825    87   16.7   3:36 (237, 70)  

* C/2019 U5 ( PanSTARRS )

Now it is 17.0 mag (Apr. 1, Michael Jager). 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)  
Apr. 24  18 22.67   47  7.2   6.724   6.924    97   16.7   3:46 (202, 77)  
May   1  18 17.40   47 58.6   6.638   6.879    99   16.7   3:36 (185, 77)  

* C/2020 N1 ( PanSTARRS )

Now it is 16.5 mag (Mar. 30, Thomas Lehmann). It will be fading after this. In the Northern Hemisphere, it will be getting lower gradually, and 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)  
Apr. 24   6 31.05    4 29.8   1.553   1.465    65   16.7  20:10 ( 73, 29)  
May   1   6 53.76    2 31.7   1.620   1.512    65   16.9  20:18 ( 74, 25)  

* 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 18.2 mag (Apr. 18, Toshihiko Ikemura, Hirohisa Sato). 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)  
Apr. 24   7 46.90   42 18.8   2.763   2.736    77   16.8  20:10 (115, 60)  
May   1   7 58.78   41 30.4   2.916   2.808    73   17.1  20:18 (114, 55)  

* C/2020 V2 ( ZTF )

Now it is 17.0 mag (Apr. 11, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 10 mag in 2023. In the Northern Hemisphere, it stays observable in good condition until 2023 autumn. In the Southern Hemipshere, it stays 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)  
Apr. 24  12 29.27   38 37.4   6.840   7.447   123   16.9  22:18 (180, 86)  
May   1  12 24.34   38 51.3   6.863   7.395   118   16.9  21:46 (180, 86)  

* 413P/2020 W4 ( Larson )

First return of a new periodic comet which brightened up to 16 mag in 2014. Now it is 16.0 mag (Apr. 4, Sandor Szabo). 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)  
Apr. 24  12 16.16   10 45.1   1.347   2.240   143   16.9  22:05 (  0, 66)  
May   1  12 12.24    9 43.9   1.377   2.225   137   16.9  21:34 (  0, 65)  

* 409P/2020 V1 ( LONEOS-Hill )

First return of a new periodic comet which brightened up to 14-15 mag in 2006. Now it is 15.7 mag (Apr. 14, Toshihiko Ikemura, Hirohisa Sato). It will be fading rapidly after this, and it will be fainter than 18 mag in May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 24  13 16.45   21 47.5   1.083   1.983   143   16.9  23:06 (  0, 77)  
May   1  13 16.22   21 29.8   1.146   2.018   138   17.2  22:38 (  0, 76)  

* 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)  
Apr. 24  18 15.74  -15 55.7   6.984   7.532   119   17.0   3:46 (353, 39)  
May   1  18 11.84  -15 33.2   6.903   7.556   127   17.0   3:36 (  0, 39)  

* 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)  
Apr. 24  11 48.95   61 46.3   3.580   3.895   100   17.2  21:37 (180, 63)  
May   1  11 31.92   61 24.5   3.581   3.815    95   17.1  20:53 (180, 64)  

* 417P/2021 B1 ( NEOWISE )

First return of a new periodic comet observed at 19 mag in 2015. It is expected to brighten up to 17 mag in early summer, and it will be observable in good condition. But now it is 18.7 mag (Apr. 20, Toshihiko Ikemura, Hirohisa Sato), fainter than this ephemeris.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 24  18 44.02  -11 16.1   0.786   1.492   112   17.2   3:46 (343, 42)  
May   1  18 58.10  -11 20.4   0.753   1.495   115   17.1   3:36 (344, 42)  

* 284P/McNaught

It will brighten up to 15 mag from summer to autumn, and it will be observable in good condition. It already locates high in the Southern Hemisphere. It will be getting higher gradually also in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 24  21 42.73   -9 21.1   2.668   2.492    69   17.6   3:46 (298, 20)  
May   1  21 53.50   -8 40.0   2.572   2.474    73   17.4   3:36 (298, 22)  

* P/2020 U2 ( PanSTARRS )

Brightened very rapidly up to 15.0 mag (Feb. 4, Michael Jager). Now it is fading. It hasl already faded down to 17.8 mag (Apr. 11, Toshihiko Ikemura, Hirohisa Sato). It is observable in good condition in the Northern Hemisphere. It locates low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 24   6 23.61   27 12.0   2.413   2.127    61   17.5  20:10 ( 98, 40)  
May   1   6 39.84   26 43.6   2.506   2.156    58   17.7  20:18 (100, 36)  

* C/2020 F2 ( ATLAS )

Now it is 17.1 mag (Apr. 11, Toshihiko Ikemura, Hirohisa Sato). 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)  
Apr. 24  15  9.05   -9 38.9   8.219   9.191   164   17.5   1:02 (  0, 45)  
May   1  15  4.55   -9 12.2   8.185   9.179   170   17.5   0:30 (  0, 46)  

* C/2020 F7 ( Lemmon )

Now it is 17.1 mag (Apr. 9, Toshihiko Ikemura, Hirohisa Sato). 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)  
Apr. 24   8 16.80   -7 17.5   5.376   5.542    94   17.5  20:10 ( 41, 39)  
May   1   8 15.87   -7 25.0   5.472   5.528    87   17.5  20:18 ( 50, 33)  

* 67P/Churyumov-Gerasimenko

Now it is 18.5 mag (Apr. 11, Taras Prystavski). 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)  
Apr. 24  22 28.69  -13 10.1   2.762   2.418    59   17.8   3:46 (293,  9)  
May   1  22 40.46  -12  5.9   2.635   2.364    63   17.6   3:36 (293, 11)  

* 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)  
Apr. 24  12 59.99  -15 52.6   6.016   6.987   163   17.6  22:49 (  0, 39)  
May   1  12 58.34  -15 17.1   6.063   7.003   157   17.6  22:20 (  0, 40)  

* 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)  
Apr. 24  10 36.94   12 18.6   4.276   4.889   122   17.6  20:27 (  0, 67)  
May   1  10 36.64   12 13.0   4.362   4.882   115   17.7  20:18 ( 12, 67)  

* 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)  
Apr. 24  13 36.21    3 45.3   2.426   3.396   161   17.7  23:25 (  0, 59)  
May   1  13 31.93    3 56.2   2.438   3.382   155   17.7  22:53 (  0, 59)  

* C/2020 K1 ( PanSTARRS )

Now it is 17.5 mag (Apr. 11, Toshihiko Ikemura, Hirohisa Sato). 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)  
Apr. 24  18 47.45   44 39.6   7.065   7.214    94   17.8   3:46 (223, 76)  
May   1  18 45.24   45  9.0   6.971   7.166    97   17.8   3:36 (210, 78)  

* C/2019 E3 ( ATLAS )

It stays 17-18 mag for a long time until 2026. In the Southern Hemisphere, it stays sobservable in good condition for a long time. It is not observable in the Northern Hemisphere. Now it is 19.7 mag (Mar. 13, A. C. Gilmore, P. M. Kilmartin), fainter than this ephemeris.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 24   8 49.66  -55 11.3  11.116  11.445   106   17.8  20:10 ( 13, -2)  
May   1   8 48.31  -54 47.6  11.136  11.429   104   17.8  20:18 ( 18, -4)  

* 22P/Kopff

Now it is 18.0 mag (Apr. 18, Toshihiko Ikemura, Hirohisa Sato). 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)  
Apr. 24  10 19.34   15  0.2   2.580   3.171   117   17.9  20:10 (  1, 70)  
May   1  10 18.82   14 58.9   2.634   3.133   110   17.8  20:18 ( 25, 68)  

* C/2021 C3 ( Catalina )

It brightened rapidly up to 16.3 mag in March (Mar. 16, F. Kugel, J.-G. Bosch). Now it is fading. It has already faded down to 18.0 mag (Apr. 11, Toshihiko Ikemura, Hirohisa Sato). It is observable in excellent condition in the Northern Hemisphere. It locates low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 24  10 26.08   38 13.7   1.905   2.408   107   17.8  20:15 (180, 87)  
May   1  10 15.06   39 48.4   2.065   2.435    98   18.0  20:18 (123, 80)  

* 6P/d'Arrest

Now it is 19.3 mag (Apr. 11, 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)  
Apr. 24  16 52.02   11  5.3   1.258   2.074   132   18.1   2:45 (  0, 66)  
May   1  16 52.26   12 37.9   1.176   2.024   135   17.9   2:17 (  0, 68)  

* 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)  
Apr. 24  22 25.59   -8 59.5   2.053   1.759    58   18.0   3:46 (290, 12)  
May   1  22 42.48   -6 48.6   1.988   1.740    61   17.9   3:36 (289, 14)  

* C/2021 C4 ( ATLAS )

Now it is 17.5 mag (Mar. 15, Giuseppe Pappa). It is observable at 18 mag in spring. It is observable in excellent condition in the Southern Hemisphere. It locates low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 24  13 21.04  -34  9.9   3.634   4.573   156   17.9  23:10 (  0, 21)  
May   1  13 10.93  -32  9.9   3.652   4.583   154   17.9  22:32 (  0, 23)  

* 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)  
Apr. 24  18  3.82   51 22.0   6.875   7.083    97   17.9   3:46 (186, 74)  
May   1  17 57.20   52 27.7   6.847   7.082    99   17.9   3:22 (180, 73)  

* 277P/LINEAR

It brightened rapidly and became brighter than expected. Now it is 17.3 mag (Mar. 30, Thomas Lehmann). It is observable in good 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)  
Apr. 24   6 11.29   18 17.8   2.485   2.149    59   17.9  20:10 ( 90, 33)  
May   1   6 26.09   17 43.9   2.576   2.177    55   18.1  20:18 ( 92, 28)  

* 98P/Takamizawa

Now it is 17.8 mag (Apr. 17, Taras Prystavski). In the Southern Hemissphere, appearing in the morning sky. It is already fading.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 24  23 26.58   -8 29.5   2.551   1.972    44   18.0   3:46 (281,  1)  
May   1  23 40.76   -7 27.7   2.534   2.007    48   18.3   3:36 (280,  2)  

* 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)  
Apr. 24  10 44.57   10 41.4   4.776   5.413   124   18.3  20:34 (  0, 66)  
May   1  10 43.34   10 38.3   4.873   5.416   117   18.4  20:18 (  8, 65)  

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