Weekly Information about Bright Comets (2023 Mar. 25: South)

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 Updated on March 25, 2023
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Best time and the azimuth, altitude (A,h) are at lat. 35 deg in the Southern Hemisphere.
Azimuth indicates 0 for south, 90 for west, 180 for north, 270 for east.

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* C/2017 K2 ( PanSTARRS )

Now it is very bright as 8.9 mag (Mar. 15, Chris Wyatt). It is observable at 8 mag for a long time from 2022 to 2023. In the Southern Hemisphere, it stays observable for a long time. In the Northern Hemisphere, it is not observable until summer. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   3 26.72  -43 18.4   2.440   2.162    62    8.4  19:29 ( 61, 42)  
Apr.  1   3 43.71  -39 19.7   2.519   2.211    60    8.6  19:19 ( 66, 41)

* C/2020 V2 ( ZTF )

Now it is 10.3 mag (Mar. 14, Osamu Miyazaki). It stays bright as 10 mag for a long time until autumn. In the Northern Hemisphere, it becomes unobservable temporarily in early April. But it becomes observable again in summer. In the Southern Hemipshere, it stays unobservable until summer. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   2  4.82   33 58.8   2.934   2.286    41    9.9  19:29 (122,-14)  
Apr.  1   2 10.45   32 13.8   3.012   2.270    35   10.0  19:19 (119,-15)

* C/2022 E3 ( ZTF )

It approached to Earth down to 0.29 a.u. in early February, and it brightened up to 4.5 mag (Feb. 1, Juan Jose Gonzalez). Now it is fading. It has already faded down to 9.3 mag (Mar. 16, Chris Wyatt). In the Northern Hemisphere, it stays observable until mid April. 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)  
Mar. 25   4 48.09   -6 27.6   1.635   1.579    68   10.1  19:29 (116, 42)  
Apr.  1   4 52.40   -7 39.4   1.822   1.654    64   10.5  19:19 (112, 40)

* C/2022 A2 ( PanSTARRS )

It brightened very rapidly. Now it is very bright as 10.5 mag (Mar. 19, Osamu Miyazaki). It will be fading gradually after this. In the Northern Hemisphere, it stays observable for a long time. But it locates low until spring. In the Southern Hemisphere, it is not observable until June. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  23 35.10   45 15.8   2.361   1.793    44   10.4   4:42 (234,-31)  
Apr.  1  23 48.95   43 53.3   2.447   1.818    41   10.6   4:48 (234,-28)

* C/2020 K1 ( PanSTARRS )

Now it is 13.3 mag (Mar. 18, Chris Wyatt). It is expected to brighten up to 10 mag from spring to summer. However, it is fainter than expected recently. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable until 2024 autumn. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  20  0.83  -42 11.6   3.272   3.105    71   11.0   4:42 (296, 52)  
Apr.  1  20  8.92  -44 23.8   3.158   3.096    77   10.9   4:48 (299, 57)

* C/2019 U5 ( PanSTARRS )

Now it is 11.6 mag (Mar. 21, Marco Goiato). It stays 12 mag until summer. It stays observable in good condition for a long time. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  12  6.04   -1 21.8   2.628   3.624   178   11.7  23:54 (180, 57)  
Apr.  1  11 50.78   -1 38.7   2.642   3.624   167   11.8  23:11 (180, 57)

* 237P/LINEAR

Now it is 13.9 mag (Mar. 18, Chris Wyatt). It will brighten very rapidly. It is expected to be observable at 11 mag in excellent condition from spring to summer. It is fainter than this ephemeris recently. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  18 37.80  -22  2.7   1.855   2.028    85   12.4   4:42 (249, 63)  
Apr.  1  18 50.90  -20 59.0   1.774   2.018    88   12.1   4:48 (240, 66)

* C/2019 L3 ( ATLAS )

It brightened up to 8.3 mag in last winter (Jan. 6, 2022, Toshiyuki Takahashi). Now it is fading. But it is bright as 12.0 mag still now (Mar. 18, Chris Wyatt). 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)  
Mar. 25   9  5.40  -34  9.6   4.603   5.243   125   12.2  20:55 (180, 89)  
Apr.  1   9  3.44  -33 42.0   4.688   5.285   121   12.3  20:26 (180, 89)

* 81P/Wild 2

Now it is 12.1 mag (Mar. 18, Osamu Miyazaki). It stays 12 mag until spring. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  17 32.33  -19  1.0   1.410   1.867   100   12.3   4:42 (214, 71)  
Apr.  1  17 39.89  -18 55.5   1.373   1.901   105   12.4   4:48 (194, 73)

* 364P/PanSTARRS

Now it is 14.7 mag (Mar. 19, Michael Jager). It will brighten very rapidly up to 11.5 mag in April. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable from mid April to mid June. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  15 32.59   30 52.2   0.199   1.117   122   14.2   3:23 (180, 24)  
Apr.  1  17  9.28   32  6.6   0.143   1.049   106   12.8   4:31 (180, 23)

* C/2019 T4 ( ATLAS )

Now it is bright as 13.1 mag (Mar. 19, Michael Jager). It stays 13 mag until spring. It stays observable in good condition for a while after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  15 44.59   11 36.6   4.209   4.863   126   13.0   3:37 (180, 44)  
Apr.  1  15 43.76   12 57.0   4.176   4.891   131   13.0   3:09 (180, 42)

* 71P/Clark

Now it is 12.8 mag (Mar. 8, Taras Prystavski). The condition is bad in this apparition. Appearing in the morning sky in the Southern Hemisphere. It is not observable until May in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  21 58.72  -18 51.6   2.347   1.691    38   13.2   4:42 (279, 21)  
Apr.  1  22 17.14  -17 31.6   2.334   1.715    41   13.3   4:48 (276, 23)

* C/2021 T4 ( Lemmon )

It brightened up to 14.5 mag in February (Feb. 16, Ken-ichi Kadota). It is expected to brighten up to 8 mag in July. Now it is not observable. In the Southern Hemisphere, it will appear in the morning sky at 13 mag in mid April, and it will be observable in excellent condition at the high light. In the Northern Hemisphere, it is not observable until June, and it becomes very low at the high lihght. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   0 28.74  -11  8.4   3.241   2.282    13   13.6  19:29 ( 71, -8)  
Apr.  1   0 30.88  -10 57.4   3.163   2.216    15   13.5   4:48 (289, -7)

* C/2021 Y1 ( ATLAS )

Now it is 14.6 mag (Mar. 18, Chris Wyatt). The brightness evolution is slower than originally predicted. It stays 14 mag until summer. In the Northern Hemisphere, it will too low to observe in late March. In the Southern Hemisphere, it stays observable in good condition for a long time. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   3 47.28  -19 14.4   2.460   2.080    56   13.7  19:29 ( 91, 37)  
Apr.  1   3 55.95  -20  4.4   2.485   2.064    54   13.7  19:19 ( 89, 36)

* C/2023 A2 ( SWAN )

Bright new comet. Now it is 13.2 mag (Mar. 2, Giuseppe Pappa). In the Southern Hemisphere, it stays observable in good condition after this. In the Northern Hemisphere, it is not observable after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  21 39.66  -43 19.0   1.724   1.440    56   13.8   4:42 (302, 35)  
Apr.  1  22  3.64  -47 48.8   1.707   1.524    62   14.0   4:48 (307, 38)

* 29P/Schwassmann-Wachmann 1

Now it is 13.8 mag (Mar. 6, Ken-ichi Kadota). 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   6 19.71   27 56.6   5.991   6.083    90   13.8  19:29 (161, 24)  
Apr.  1   6 21.89   27 46.5   6.105   6.085    84   13.8  19:19 (157, 23)

* 77P/Longmore

Now it is 14.9 mag (Mar. 18, Chris Wyatt). It will brighten rapidly up to 14 mag and will be observable in excellent condition in spring. In the Northern Hemisphere, it was observable in good condition in winter, but it becomes somewhat low in spring. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  14 30.82  -24 12.7   1.498   2.350   139   14.2   2:24 (180, 79)  
Apr.  1  14 25.94  -25 41.3   1.449   2.349   146   14.1   1:52 (180, 81)

* (394130) 2006 HY51

It approaches to Sun down to 0.08 a.u. on Apr. 2, and it will brighten up to 13 mag. But it is not observable at that time. In the Northern Hemisphere, it appears in the evening sky in early April, but it will be fainter than 18 mag. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  23  9.11  -13 33.0   0.931   0.373    21   17.9   4:42 (284,  4)  
Apr.  1   0 31.81    0  5.4   1.067   0.106     4   14.2   4:48 (280,-13)

* C/2021 S3 ( PanSTARRS )

Now it is 14.6 mag (Mar. 18, Chris Wyatt). It is expected to brighten up to 7 mag in early 2024. In the Southern Hemisphere, it stays observable in good condition for a long time. It locates low in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   5 17.97  -30 49.9   4.365   4.285    78   14.5  19:29 ( 88, 60)  
Apr.  1   5 21.23  -29 53.6   4.356   4.216    75   14.4  19:19 ( 88, 57)

* C/2022 U2 ( ATLAS )

It brightened very rapidly up to 9.6 mag in late January (Jan. 25, Toshihiko Ikemura, Hirohisa Sato). Now it is fading. It has already faded down to 13.5 mag (Mar. 10, Masayoshi Yoshimi). It stays observable in good condition for a long time. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   6 42.18    0 41.3   1.222   1.669    97   14.5  19:29 (157, 52)  
Apr.  1   6 53.70   -1 49.6   1.349   1.730    93   15.1  19:19 (153, 54)

* C/2022 P1 ( NEOWISE )

It brightened up to 9.7 mag in autumn (Oct. 23, Marco Goiato). Now it is fading. It has already faded down to 12.9 mag (Mar. 14, Thomas Lehmann). In the Southern Hemisphere, it stays observable in good condition for a long time. It locates low in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  18 39.69  -43  1.6   1.989   2.167    86   14.6   4:42 (299, 67)  
Apr.  1  18 21.87  -43 59.9   1.884   2.224    96   14.8   4:48 (312, 75)

* 118P/Shoemaker-Levy 4

Now it is 13.8 mag (Mar. 11, Thomas Lehmann). It will be fading after this. It stays observable in good condition for a while. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   8 34.92   20 47.8   1.380   2.087   122   14.7  20:25 (180, 34)  
Apr.  1   8 41.18   20 57.8   1.471   2.114   116   14.9  20:04 (180, 34)

* C/2020 S4 ( PanSTARRS )

Now it is 14.7 mag (Mar. 14, W. Pei). It stays 14.5 mag and observable in good condition until spring. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   9 21.62   29 17.5   2.681   3.395   128   14.7  21:12 (180, 26)  
Apr.  1   9 23.08   29 25.0   2.764   3.403   122   14.7  20:46 (180, 26)

* C/2021 X1 ( Maury-Attard )

Now it is 15.3 mag (Mar. 11, Thomas Lehmann). It stays 14 mag in 2023. It will be unobservable soon. Then it is not observable until May in the Southern Hemisphere, or until June in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   2 33.64   -5 45.1   4.049   3.290    35   14.7  19:29 ( 93, 14)  
Apr.  1   2 33.89   -4 37.9   4.106   3.278    29   14.7  19:19 ( 92, 10)

* C/2021 G2 ( ATLAS )

Now it is 15.3 mag (Mar. 16, Y. Sugiyama). It will brighten up to 13 mag from 2024 to 2025. It is observable in excllent 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)  
Mar. 25   8 44.16  -36 15.7   5.838   6.402   120   15.2  20:34 (  0, 89)  
Apr.  1   8 43.75  -35 29.6   5.846   6.370   117   15.2  20:06 (  0, 89)

* 300P/Catalina

Now it is 17.3 mag (Mar. 16, E. Cortes, N. Paul, B. Lutkenhoner). It will approach to Sun down to 0.8 a.u. in April, and it will brighten up to 15 mag. In the Southern Hemisphere, it stays observable in the extremely low sky. In the Northern Hemisphere, it is not observable after March. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  22  9.54  -12 16.5   1.504   0.874    33   15.5   4:42 (274, 15)  
Apr.  1  22 46.11   -9 19.2   1.523   0.847    31   15.3   4:48 (272, 13)

* 96P/Machholz 1

It approached to Sun down to 0.1 a.u. on Jan. 31. It was bright as 7.0-7.5 mag in early February (Feb. 5, Michael Jager). Now it is fading rapidly. It has already faded down to 12.0 mag (Mar. 6, Ken-ichi Kadota). It stays observable after this while the comet will be fading. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  20 20.13   -8  6.5   1.571   1.360    59   15.3   4:42 (254, 35)  
Apr.  1  20 20.14   -8 26.0   1.573   1.479    65   15.7   4:48 (247, 42)

* C/2022 E2 ( ATLAS )

Now it is 15.4 mag (Mar. 5, Giuseppe Pappa). It is expected to brighten up to 12 mag from 2024 to 2025. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   9 15.35  -11 14.8   5.140   5.884   134   15.4  21:05 (180, 66)  
Apr.  1   9 10.54  -10  1.7   5.173   5.841   127   15.3  20:33 (180, 65)

* C/2020 R7 ( ATLAS )

It brightened up to 13.4 mag in last summer (July 7, Giuseppe Pappa). Now it is fading. It has already faded down to 15.5 mag (Mar. 3, Ken-ichi Kadota). It stays 15-16 mag until summer. It stays observable in good condition for a while. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  18  5.69    9  1.2   3.322   3.498    91   15.4   4:42 (206, 42)  
Apr.  1  18  2.25   11 32.3   3.250   3.534    98   15.4   4:48 (193, 43)

* 117P/Helin-Roman-Alu 1

Now it is 14.8 mag (Dec. 8, ATLAS Chile). In the Southern Hemisphere, apperaing in the morning sky. In the Northern Hemisphere, it will become observable in late May. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  22 57.54  -14  3.6   4.172   3.291    24   15.4   4:42 (283,  6)  
Apr.  1  23  6.96  -13  9.7   4.144   3.303    28   15.4   4:48 (279, 11)

* C/2022 L2 ( ATLAS )

Now it is 16.5 mag (Mar. 19, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 11.5 mag in 2024 spring. It stays observable in good condition for a long time. At the high light, it will be observable in excellent condition in the Southern Hemisphere, but it will be low in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  18 35.51   17 47.6   4.408   4.423    84   15.7   4:42 (210, 32)  
Apr.  1  18 33.26   18 28.6   4.255   4.373    90   15.6   4:48 (200, 34)

* 119P/Parker-Hartley

It continued brightening even after the perihelion passage. Now it is 15.4 mag (Mar. 5, Giuseppe Pappa). It will be fading after this, and it will be fainter than 18 mag in July. 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)  
Mar. 25   7 35.18   25 43.8   2.307   2.776   107   15.7  19:29 (179, 29)  
Apr.  1   7 40.30   25 35.6   2.418   2.799   101   15.8  19:19 (176, 29)

* 126P/IRAS

Now it is 16.1 mag (Mar. 9, B. Lutkenhoner, N. Paul, E. Cortes). It will brighten rapidly up to 13.5 mag in summer. In the Southern Hemisphere, it stays observable until August. In the Northern Hemisphere, it is not observable until June. But it stays observable in good condition after that. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  22 59.30  -35 34.5   2.678   2.032    40   16.0   4:42 (301, 18)  
Apr.  1  23 14.76  -33  1.7   2.616   1.994    42   15.8   4:48 (297, 20)

* 199P/Shoemaker 4

Now it is 16.5 mag (Mar. 18, J.-C. Merlin). It stays observable at 14-15 mag from spring to autumn. It locates somewhat low in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  18 12.95  -14 33.2   2.889   3.066    90   16.0   4:42 (228, 62)  
Apr.  1  18 18.80  -14 53.5   2.779   3.051    96   15.8   4:48 (215, 66)

* C/2021 E3 ( ZTF )

It brightened up to 9.3 mag in early summer in 2022 (June 5, Chris Wyatt). Now it is fading. It has already faded down to 16.6 mag (Mar. 19, Toshihiko Ikemura, Hirohisa Sato). In the Southen 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)  
Mar. 25   6 41.32  -14  4.9   3.543   3.796    97   16.1  19:29 (145, 65)  
Apr.  1   6 41.19  -12  2.7   3.705   3.860    91   16.3  19:19 (139, 61)

* C/2022 W3 ( Leonard )

Now it is 17.6 mag (Mar. 5, F. Kugel, J. Nicolas). It will brighten up to 13 mag in summer. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it is not observable until August. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   2 29.29   69 28.8   1.945   1.885    71   16.2  19:29 (157,-28)  
Apr.  1   2 21.74   67 43.2   1.988   1.823    65   16.1  19:19 (154,-30)

* C/2022 A3 ( Lemmon-ATLAS )

Now it is 15.9 mag (Mar. 14, Hirohisa Sato). It stays observable at 16 mag for a long time from early 2023 to early 2024. In the Northern Hemisphere, it is observable only until 2023 spring. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   8 40.41   -7 12.4   3.386   4.059   126   16.2  20:30 (180, 62)  
Apr.  1   8 34.30   -7 29.8   3.454   4.035   119   16.3  19:56 (180, 63)

* C/2018 U1 ( Lemmon )

It was observed at 15 mag from 2021 to 2022. Now it is fading. Now it is 17.2 mag (Mar. 8, J. L. Virlichie, P. Traverse, H. Roy, G. Houdin). In the Southern Hemisphere, it stays observable in excellent condition for a long time. In the Northern Hemiphere, it is not observable after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  14  4.28  -73  6.0   5.932   6.287   106   16.4   1:59 (  0, 52)  
Apr.  1  13 43.14  -73 36.6   5.906   6.318   109   16.4   1:11 (  0, 51)

* 94P/Russell 4

Now it is 16.9 mag (Mar. 19, Toshihiko Ikemura, Hirohisa Sato). It is observable at 16.5 mag in good condition in spring. It locates somewhat low in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   8 17.54   28  4.8   1.638   2.262   116   16.5  20:08 (180, 27)  
Apr.  1   8 22.06   27 35.6   1.702   2.254   110   16.5  19:45 (180, 28)

* P/2023 B1 ( PanSTARRS )

Now it is 17.0 mag (Mar. 14, ATLAS Chile). It moves along an almost circular orbit. It seems to be bright temporarily in outburst. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  10 42.80   26  9.3   5.301   6.141   144   16.5  22:32 (180, 29)  
Apr.  1  10 40.38   26 12.3   5.361   6.141   138   16.5  22:02 (180, 29)

* C/2023 E1 ( ATLAS )

Now it is 17.7 mag (Mar. 18, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 13 mag from June to August. In the Northern Hemisphere, it stays observable in excellent condition. In the Southern Hemisphere, it becomes unobservable from late April to early August. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  12 45.81   25 48.6   0.886   1.826   151   16.9   0:39 (180, 30)  
Apr.  1  12 41.60   31 32.8   0.835   1.746   144   16.5   0:08 (180, 24)

* C/2023 B2 ( ATLAS )

Now it is 16.0 mag (Mar. 17, ATLAS Chile). It brightens up to 16.5 mag from March to April. In the Southern Hemisphere, it stays observable in excellent condition. In the Northern Hemisphere, it will be getting higher gradually after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  11 51.25  -48 25.9   0.915   1.753   132   16.7  23:41 (  0, 77)  
Apr.  1  11 57.54  -44 21.0   0.886   1.765   138   16.7  23:20 (  0, 81)

* 263P/Gibbs

Now it is 16.6 mag (Mar. 5, ATLAS South Africa). It will be fading after this, and it will be fainter than 18 mag in early May. It locates somewhat low in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  13 35.24   30 14.0   0.453   1.386   142   16.7   1:28 (180, 25)  
Apr.  1  13 32.02   29  4.4   0.486   1.423   144   16.9   0:58 (180, 26)

* 116P/Wild 4

It brightened up to 12.7 mag in last year (Feb. 27, 2022, Jose Guilherme de S. Aguiar). Now it is fading. It has already faded down to 17.1 mag (Mar. 17, J.-C. Merlin). In the Southern Hemisphere, it stays observable until summer when it becomes fainter than 18 mag. It locates low in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  19 29.25  -25  7.5   2.866   2.757    73   16.8   4:42 (265, 54)  
Apr.  1  19 37.53  -24 58.1   2.799   2.781    78   16.8   4:48 (260, 59)

* C/2023 A1 ( Leonard )

Now it is 15.8 mag (Mar. 19, Toshihiko Ikemura, Hirohisa Sato). It will be fading after this, and it will be fainter than 18 mag in early May. 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)  
Mar. 25   7 25.23   45 46.4   1.360   1.837   101   16.8  19:29 (178, 10)  
Apr.  1   7 18.17   39 10.6   1.467   1.842    94   17.0  19:19 (172, 16)

* C/2019 E3 ( ATLAS )

Now it is 16.8 mag (Mar. 19, ATLAS South Africa). Very far object. It stays 16-17 mag for a long time from 2021 to 2026. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable at all. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   4 56.39  -71 16.8  10.423  10.390    85   16.8  19:29 ( 18, 48)  
Apr.  1   4 55.73  -70 39.0  10.412  10.385    85   16.8  19:19 ( 20, 47)

* 280P/Larsen

It has not been observed yet in this apparition. In the last apparition, it had faded before the perihelion passage. If it becomes as bright as its last apparition, it will brighten up to 17 mag. It stays observable in good condition for a long time. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  14 14.64    3 57.6   1.884   2.788   149   17.0   2:08 (180, 51)  
Apr.  1  14 12.39    4 44.6   1.836   2.774   155   17.0   1:38 (180, 50)

* C/2022 U4 ( Bok )

Now it is 17.5 mag (Mar. 12, ATLAS-HKO, Haleakala). In the Northern Hemisphere, it stays observable at 17 mag in good condition from spring to summer. In the Southern Hemisphere, it locates extremely low only in summer. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  13 14.82   52 52.2   2.516   3.184   124   17.0   1:08 (180,  2)  
Apr.  1  13 12.43   54  9.4   2.521   3.156   121   17.0   0:38 (180,  1)

* C/2020 F2 ( ATLAS )

Now it is 16.7 mag (Mar. 18, ATLAS Chile). It stays 17 mag and observable in good condition until summer. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  13  3.62   10 46.3   7.982   8.938   162   17.0   0:57 (180, 44)  
Apr.  1  12 59.00   11 20.5   7.982   8.945   163   17.0   0:25 (180, 44)

* C/2022 Q2 ( ATLAS )

It was observed at 17 mag in 2022 autumn. It is observable at 17 mag also in 2023 spring. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  20 22.78    4 27.8   2.099   1.779    57   17.1   4:42 (243, 26)  
Apr.  1  20 14.88    6 26.1   1.979   1.815    65   17.1   4:48 (233, 32)

* 180P/NEAT

Now it is 16.8 mag (Mar. 19, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 17 mag from spring to early summer. It locates low in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   9  8.98   37 54.6   1.927   2.597   121   17.2  20:59 (180, 17)  
Apr.  1   9  9.87   37 25.6   1.986   2.585   116   17.2  20:33 (180, 18)

* 408P/2020 M7 ( Novichonok-Gerke )

Now it is 16.8 mag (Mar. 2, ATLAS Chile). It will be fading and getting lower gradually after this. It will be unobservable in April in the Northern Hemisphere, or in May in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   4 37.51    4 39.4   3.851   3.561    65   17.2  19:29 (124, 32)  
Apr.  1   4 44.60    5 12.2   3.943   3.569    61   17.3  19:19 (122, 30)

* P/2022 L3 ( ATLAS )

It brightened up to 14.1 mag in autumn (Nov. 14, Thomas Lehmann). Now it is fading. It has already faded down to 17.5 mag (Mar. 8, D. Buczynski). In the Northern Hemisphere, it stays observable in excellent condition for a while. In the Southern Hemisphere, it is not observable after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   3 52.46   36  9.3   3.064   2.727    61   17.3  19:29 (138,  2)  
Apr.  1   4  5.85   36 43.3   3.163   2.755    57   17.4  19:19 (138,  1)

* C/2014 UN271 ( Bernardinelli-Bernstein )

Now it is 17.1 mag (Mar. 13, ATLAS Chile). Very large comet. It is expected to brighten up to 14 mag in 2031. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable until 2030. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   2 39.49  -57 44.6  18.234  17.851    65   17.3  19:29 ( 40, 37)  
Apr.  1   2 42.07  -57 34.8  18.199  17.826    66   17.3  19:19 ( 40, 35)

* 204P/LINEAR-NEAT

It brightened rapidly. Now it is 16.9 mag (Mar. 14, Purple Mountain Observatory, XuYi Station). It will be fading after this. It will be fainter than 18 mag in April. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   9 52.76   22  5.5   1.291   2.141   138   17.4  21:43 (180, 33)  
Apr.  1   9 54.09   21 50.3   1.372   2.170   131   17.6  21:17 (180, 33)

* P/2021 N2 ( Fuls )

It brightened very rapidly up to 15.5 mag from last autumn to last winter (Nov. 2, 2021, Toshihiko Ikemura, Hirohisa Sato). Now it is fading slowly. It has already faded down to 16.8 mag (Mar. 19, Toshihiko Ikemura, Hirohisa Sato). 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   6 17.34   11 11.3   4.607   4.723    90   17.4  19:29 (154, 40)  
Apr.  1   6 20.65   11 22.1   4.733   4.745    84   17.4  19:19 (150, 38)

* C/2023 A3 ( Tsuchinshan-ATLAS )

It will approach to Sun down to 0.4 a.u. in late September in 2024, and it is expected to brighten up to 0 mag. Now it is 17.3 mag (Mar. 18, Toshihiko Ikemura, Hirohisa Sato). It stays observable in good condition for a while. At the high light, in the Northern Hemisphere, it will be observable in good condition after the perihelion passage. In the Southern Hemisphere, it will be observable in the low sky before and after the perihelion passage. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  15 14.05    0  7.7   6.305   7.045   134   17.5   3:07 (180, 55)  
Apr.  1  15 10.68    0 31.6   6.169   6.982   141   17.4   2:36 (180, 55)

* 402P/2020 Q3 ( LINEAR )

It brightened up to 15.3 mag in last winter (Jan. 12, 2022, H. Nohara). Now it is fading. It has already faded down to 17.2 mag (Mar. 15, ATLAS-HKO, Haleakala). It will be observable at 17 mag in good condition in next winter. It locates low in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   9 53.17   31  3.0   3.962   4.703   133   17.4  21:43 (180, 24)  
Apr.  1   9 51.55   31 14.4   4.058   4.722   126   17.5  21:14 (180, 24)

* C/2020 H6 ( ATLAS )

Now it is 17.3 mag (Mar. 10, Catalina Sky Survey). Fading slowly. In the Southern Hemisphere, it is not observable after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  18 44.56   53  2.9   6.303   6.281    84   17.5   4:42 (197, -1)  
Apr.  1  18 48.03   54 19.8   6.319   6.315    85   17.5   4:48 (192, -1)

* C/2019 O3 ( Palomar )

Now it is 17.4 mag (Mar. 12, ATLAS-HKO, Haleakala). Fading slowly. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it is not observable after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  18 33.07   72 57.3   9.807   9.808    87   17.5   4:42 (188,-19)  
Apr.  1  18 31.51   73 55.9   9.836   9.825    86   17.5   4:48 (185,-20)

* 99P/Kowal 1

It brightened up to 15.9 mag in 2022 spring (May 5, Toshiyuki Takahashi). Now it is 17.4 mag (Mar. 18, J.-C. Merlin). In 2023, it is observable at 17.5 mag in spring. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  16 31.40  -24 23.8   4.393   4.881   113   17.7   4:24 (180, 79)  
Apr.  1  16 31.53  -24 30.5   4.302   4.888   120   17.7   3:57 (180, 80)

* 80P/Peters-Hartley

Now it is 17.9 mag (Mar. 21, John Maikner). It will be getting higher gradually, but it will be fading after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  20 55.98   -3 16.0   2.433   1.943    49   17.8   4:42 (256, 25)  
Apr.  1  21  8.09   -0 55.7   2.414   1.981    53   17.9   4:48 (250, 28)

* 244P/Scotti

Now it is 18.4 mag (Mar. 18, ATLAS-HKO, Haleakala). It will be fading after this, and it will be fainter than 18 mag in April. It locates somewhat low in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   6  0.81   25 35.2   3.886   3.951    86   17.8  19:29 (156, 25)  
Apr.  1   6  5.74   25 30.7   3.993   3.955    80   17.9  19:19 (153, 24)

* 452P/2022 B5 ( Sheppard-Jewitt )

Now it is 18.2 mag (Feb. 27, Ken-ichi Kadota). It stays observable at 18 mag in good condition from January to March. It looks elongated. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  10  7.89   16  9.6   3.332   4.182   144   17.8  21:58 (180, 39)  
Apr.  1  10  6.22   16 20.5   3.394   4.180   136   17.9  21:28 (180, 39)

* C/2022 W2 ( ATLAS )

Now it is 18 mag (Feb. 11, Giuseppe Pappa). It stays 17.5 mag until spring. It is observable in good condition in the Northern Hemisphere. It is not observable in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   5  9.89   69 15.7   3.088   3.127    82   17.9  19:29 (167,-18)  
Apr.  1   5 32.46   66 57.5   3.153   3.131    79   18.0  19:19 (166,-15)

* 12P/Pons-Brooks

Now it is 17.8 mag (Feb. 27, H. Nohara). It returns for the first time in 70 years. It will brighten up to 4.5 mag in 2024 spring. In the Northern Hemisphere, it stays observable in good condition until 2024 spring while the comet will be brightening gradually. In the Southern Hemisphere, it is observable only in 2023 spring in the extremely low sky before the perihelion passage. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  19 27.12   34 12.9   5.199   5.018    74   18.0   4:42 (212, 12)  
Apr.  1  19 30.24   35 35.8   5.079   4.954    77   17.9   4:48 (206, 13)

* 65P/Gunn

Now it is 17.9 mag (Mar. 10, A. Diepvens). It will brighten up to 15 mag from 2024 to 2025. In 2023, it is observable at 18 mag in spring. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   9 30.08   26 22.4   3.606   4.333   131   17.9  21:20 (180, 29)  
Apr.  1   9 27.94   26 17.6   3.675   4.321   124   17.9  20:50 (180, 29)

* 61P/Shajn-Schaldach

It brightened up to 14.6 mag in autumn (Oct. 19, Toshihiko Ikemura, Hirohisa Sato). Now it is fading. It has already faded down to 17.6 mag (Feb. 16, Toshihiko Ikemura, Hirohisa Sato). It will be fainter than 18 mag in spring. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   3 47.21   14 45.9   2.853   2.411    54   17.9  19:29 (122, 16)  
Apr.  1   4  0.06   15 33.3   2.943   2.435    50   18.1  19:19 (122, 15)

* 287P/Christensen

It will brighten up to 16.5 mag in summer. It stays observable in good condition for a long time. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  21 27.04  -12  4.1   3.724   3.079    43   18.0   4:42 (268, 24)  
Apr.  1  21 36.95  -11 33.1   3.651   3.073    48   17.9   4:48 (264, 28)

* C/2021 C5 ( PanSTARRS )

It was predicted to brighten up to 16 mag in 2023. But actually, it is very faint as 18.6 mag (Mar. 2, Taras Prystavski). In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it will never be observable again. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25  19 21.11  -74 38.5   3.162   3.266    87   18.0   4:42 (346, 46)  
Apr.  1  19 44.70  -74 60.0   3.121   3.275    89   18.0   4:48 (347, 47)

* C/2022 S3 ( PanSTARRS )

Tiny comet, but it approached to Sun down to 0.8 a.u. in January, and it will approach to Earth down to 0.6 a.u. in March. It was expected to brighten up to 14 mag from January to March. But actually, it became disintegrated before the perihelion passage. Now it is extremely faint as 18.2 mag (Feb. 20, Thomas Lehmann). In the Southern Hemisphere, it stays observable in good condition for a long time. It becomes observable in good condition after this also in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 25   7  8.40   -3 23.4   0.759   1.389   103   19.8  19:29 (167, 57)  
Apr.  1   7 31.03    5 54.1   0.899   1.480   102   20.3  19:19 (171, 48)

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