Weekly Information about Bright Comets (2023 Mar. 18: North)

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 Updated on March 19, 2023
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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/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. 18   3  7.45  -47 30.3   2.371   2.116    63    8.3  19:33 ( 37, -9)  
Mar. 25   3 26.72  -43 18.4   2.440   2.162    62    8.4  19:39 ( 42, -8)

* 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. 18   4 44.29   -4 58.5   1.439   1.507    73    9.6  19:33 ( 49, 37)  
Mar. 25   4 48.09   -6 27.6   1.635   1.579    68   10.1  19:39 ( 55, 31)

* 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. 18   1 59.22   35 56.6   2.848   2.306    48    9.9  19:33 (116, 28)  
Mar. 25   2  4.82   33 58.8   2.934   2.286    41    9.9  19:39 (117, 22)

* C/2022 A2 ( PanSTARRS )

It brightened very rapidly. Now it is very bright as 9.3 mag (Mar. 15, Juan Jose Gonzalez). It stays 9-10 mag until March. 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. 18  23 19.04   46 49.7   2.267   1.773    48   10.3   4:43 (224, 17)  
Mar. 25  23 35.10   45 15.8   2.361   1.793    44   10.4   4:32 (225, 16)

* C/2020 K1 ( PanSTARRS )

Now it is 13.2 mag (Mar. 2, Thomas Lehmann). It is expected to brighten up to 10 mag from spring to summer. 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. 18  19 52.66  -40 10.9   3.387   3.115    65   11.1   4:43 (323,  1)  
Mar. 25  20  0.83  -42 11.6   3.272   3.105    71   11.0   4:32 (325,  0)

* C/2019 U5 ( PanSTARRS )

Now it is 11.7 mag (Mar. 15, Osamu Miyazaki). 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. 18  12 21.36   -1  4.5   2.639   3.626   171   11.8   0:43 (  0, 54)  
Mar. 25  12  6.04   -1 21.8   2.628   3.624   178   11.7  23:54 (  0, 53)

* 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. 16, 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. 18   9  8.11  -34 34.1   4.527   5.201   128   12.1  21:25 (  0, 20)  
Mar. 25   9  5.40  -34  9.6   4.603   5.243   125   12.2  20:55 (  0, 21)

* 81P/Wild 2

Now it is 12.0 mag (Feb. 27, Osamu Miyazaki). It stays 12 mag until spring. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 18  17 23.12  -19  3.8   1.448   1.834    95   12.2   4:43 (343, 34)  
Mar. 25  17 32.33  -19  1.0   1.410   1.867   100   12.3   4:32 (345, 35)

* 237P/LINEAR

Now it is 13.7 mag (Feb. 26, F. Kugel, J. Nicolas). It will brighten very rapidly. It is expected to be observable at 11 mag in excellent condition from spring to summer. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 18  18 23.99  -22 58.5   1.938   2.040    81   12.7   4:43 (329, 25)  
Mar. 25  18 37.80  -22  2.7   1.855   2.028    85   12.4   4:32 (329, 26)

* C/2019 T4 ( ATLAS )

Now it is bright as 12.5 mag (Mar. 1, Giuseppe Pappa). 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. 18  15 44.77   10 15.8   4.253   4.836   120   13.0   4:05 (  0, 65)  
Mar. 25  15 44.59   11 36.6   4.209   4.863   126   13.0   3:37 (  0, 66)

* 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. 18  21 39.54  -20  8.6   2.359   1.670    36   13.2   4:43 (293, -3)  
Mar. 25  21 58.72  -18 51.6   2.347   1.691    38   13.2   4:32 (291, -3)

* 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. 18  21 18.44  -38 49.7   1.747   1.358    50   13.5   4:43 (310,-10)  
Mar. 25  21 39.66  -43 19.0   1.724   1.440    56   13.8   4:32 (313,-14)

* 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. 18   0 26.75  -11 22.0   3.303   2.349    13   13.8  19:33 ( 88,-16)  
Mar. 25   0 28.74  -11  8.4   3.241   2.282    13   13.6  19:39 ( 92,-23)

* C/2021 Y1 ( ATLAS )

Now it is 14.6 mag (Mar. 16, 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. 18   3 39.52  -18 26.0   2.427   2.099    59   13.7  19:33 ( 53, 16)  
Mar. 25   3 47.28  -19 14.4   2.460   2.080    56   13.7  19:39 ( 57, 11)

* 29P/Schwassmann-Wachmann 1

Now it is 14 mag (Mar. 5, Giuseppe Pappa). 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 18   6 18.08   28  6.6   5.876   6.081    97   13.7  19:33 ( 64, 76)  
Mar. 25   6 19.71   27 56.6   5.991   6.083    90   13.8  19:39 ( 76, 70)

* 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 12.8 mag (Mar. 3, Ken-ichi Kadota). 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. 18   6 30.40    3 45.4   1.098   1.612   100   13.9  19:33 ( 20, 57)  
Mar. 25   6 42.18    0 41.3   1.222   1.669    97   14.5  19:39 ( 28, 52)

* 77P/Longmore

Now it is 14.9 mag (Mar. 15, 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. 18  14 34.05  -22 40.3   1.556   2.351   133   14.2   2:55 (  0, 32)  
Mar. 25  14 30.82  -24 12.7   1.498   2.350   139   14.2   2:24 (  0, 31)

* 364P/PanSTARRS

Now it is 15.6 mag (Mar. 13, ATLAS South Africa). 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. 18  14 40.95   28  4.1   0.269   1.188   130   15.5   3:00 (  0, 83)  
Mar. 25  15 32.59   30 52.2   0.199   1.117   122   14.2   3:23 (  0, 86)

* 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. 18  18 53.27  -42  3.6   2.097   2.111    77   14.3   4:43 (333,  6)  
Mar. 25  18 39.69  -43  1.6   1.989   2.167    86   14.6   4:32 (338,  7)

* 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. 18   8 29.84   20 27.6   1.294   2.061   127   14.4  20:48 (  0, 75)  
Mar. 25   8 34.92   20 47.8   1.380   2.087   122   14.7  20:25 (  0, 76)

* C/2021 S3 ( PanSTARRS )

Now it is 14.7 mag (Mar. 16, 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. 18   5 15.53  -31 47.5   4.372   4.353    82   14.6  19:33 ( 26, 18)  
Mar. 25   5 17.97  -30 49.9   4.365   4.285    78   14.5  19:39 ( 33, 15)

* C/2020 S4 ( PanSTARRS )

Now it is 15.0 mag (Mar. 2, ATLAS Chile). 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. 18   9 21.06   29  2.3   2.607   3.387   135   14.6  21:39 (  0, 84)  
Mar. 25   9 21.62   29 17.5   2.681   3.395   128   14.7  21:12 (  0, 84)

* C/2021 X1 ( Maury-Attard )

Now it is 15.3 mag (Mar. 11, Thomas Lehmann). It stays 14 mag in 2023. In the Southern Hemisphere, it stays observable in good condition for a long time, although it becomes unobservable temporarily from April to May. It locates somewhat low in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 18   2 33.85   -6 55.8   3.980   3.303    41   14.7  19:33 ( 73, 12)  
Mar. 25   2 33.64   -5 45.1   4.049   3.290    35   14.7  19:39 ( 79,  6)

* 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. 18  20 18.99   -7 48.8   1.555   1.235    52   14.8   4:43 (295, 20)  
Mar. 25  20 20.13   -8  6.5   1.571   1.360    59   15.3   4:32 (298, 23)

* C/2021 G2 ( ATLAS )

Now it is 15.3 mag (Mar. 12, ATLAS Chile). 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. 18   8 45.15  -36 58.9   5.838   6.434   122   15.2  21:02 (  0, 18)  
Mar. 25   8 44.16  -36 15.7   5.838   6.402   120   15.2  20:34 (  0, 19)

* C/2022 E2 ( ATLAS )

Now it is 15.2 mag (Mar. 1, ATLAS South Africa). 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. 18   9 20.73  -12 27.3   5.122   5.927   140   15.4  21:38 (  0, 43)  
Mar. 25   9 15.35  -11 14.8   5.140   5.884   134   15.4  21:05 (  0, 44)

* 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. 18  18  7.97    6 36.2   3.399   3.462    85   15.4   4:43 (313, 53)  
Mar. 25  18  5.69    9  1.2   3.322   3.498    91   15.4   4:32 (318, 57)

* 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. 18  22 47.88  -14 58.5   4.194   3.279    20   15.4   4:43 (279,-13)  
Mar. 25  22 57.54  -14  3.6   4.172   3.291    24   15.4   4:32 (279,-11)

* 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. 18   7 31.05   25 48.3   2.199   2.752   113   15.5  19:49 (  0, 81)  
Mar. 25   7 35.18   25 43.8   2.307   2.776   107   15.7  19:39 ( 18, 80)

* 300P/Catalina

Now it is 17.6 mag (Mar. 12, B. Lutkenhoner, N. Paul, E. Cortes). 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. 18  21 32.14  -14 54.7   1.499   0.912    36   16.0   4:43 (290,  2)  
Mar. 25  22  9.54  -12 16.5   1.504   0.874    33   15.5   4:32 (284, -1)

* C/2022 L2 ( ATLAS )

Now it is 16.4 mag (Mar. 13, ATLAS South Africa). 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. 18  18 36.84   17  9.3   4.560   4.474    78   15.8   4:43 (292, 55)  
Mar. 25  18 35.51   17 47.6   4.408   4.423    84   15.7   4:32 (296, 59)

* 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 16.4 mag (Mar. 12, ATLAS Chile). 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. 18   6 42.46  -16 18.7   3.386   3.732   102   15.9  19:33 ( 10, 38)  
Mar. 25   6 41.32  -14  4.9   3.543   3.796    97   16.1  19:39 ( 21, 38)

* 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. 18  22 43.12  -38  2.2   2.738   2.072    39   16.1   4:43 (301,-24)  
Mar. 25  22 59.30  -35 34.5   2.678   2.032    40   16.0   4:32 (298,-23)

* 199P/Shoemaker 4

Now it is 17.3 mag (Mar. 8, 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. 18  18  6.42  -14 14.3   2.999   3.081    85   16.1   4:43 (329, 35)  
Mar. 25  18 12.95  -14 33.2   2.889   3.066    90   16.0   4:32 (332, 36)

* C/2022 W3 ( Leonard )

Now it is 16.5 mag (Feb. 23, Ken-ichi Kadota). 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. 18   2 41.42   71 34.7   1.897   1.949    77   16.3  19:33 (157, 40)  
Mar. 25   2 29.29   69 28.8   1.945   1.885    71   16.2  19:39 (155, 36)

* C/2022 A3 ( Lemmon-ATLAS )

Now it is 15.7 mag (Mar. 5, Giuseppe Pappa). 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. 18   8 47.56   -6 53.3   3.328   4.085   134   16.2  21:04 (  0, 48)  
Mar. 25   8 40.41   -7 12.4   3.386   4.059   126   16.2  20:30 (  0, 48)

* C/2018 U1 ( Lemmon )

It was observed at 15 mag from 2021 to 2022. Now it is fading. Now it is 16.3 mag (Feb. 11, J.-C. Merlin, D. De Martin). 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. 18  14 22.90  -72 21.4   5.966   6.256   102   16.3   2:45 (  0,-17)  
Mar. 25  14  4.28  -73  6.0   5.932   6.287   106   16.4   1:59 (  0,-18)

* 94P/Russell 4

Now it is 16.6 mag (Mar. 6, Ken-ichi Kadota). 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. 18   8 14.53   28 28.2   1.578   2.271   122   16.5  20:33 (  0, 83)  
Mar. 25   8 17.54   28  4.8   1.638   2.262   116   16.5  20:08 (  0, 83)

* P/2023 B1 ( PanSTARRS )

Now it is 16.9 mag (Mar. 2, 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. 18  10 45.54   26  2.0   5.252   6.142   150   16.5  23:03 (  0, 81)  
Mar. 25  10 42.80   26  9.3   5.301   6.141   144   16.5  22:32 (  0, 81)

* 263P/Gibbs

Now it is 16.4 mag (Mar. 1, Catalina Sky Survey). It is observable at 16.5 mag in good condition from January to March. It locates somewhat low in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 18  13 37.01   30 56.4   0.425   1.351   140   16.6   1:58 (  0, 86)  
Mar. 25  13 35.24   30 14.0   0.453   1.386   142   16.7   1:28 (  0, 85)

* C/2020 Y2 ( ATLAS )

Now it is 15.8 mag (Feb. 22, ATLAS South Africa). It was expected to brighten up to 13 mag in 2022 spring. But actually, it was fainter than originally expected. In the Southern Hemisphere, it stays observable in good condition for a long time, although it becomes unobservable temporarily from April to May. In the Northern Hemisphere, it is not observable until July. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 18   2 21.34  -17 50.2   4.759   4.062    41   16.6  19:33 ( 66,  3)  
Mar. 25   2 24.19  -16 20.5   4.857   4.102    36   16.7  19:39 ( 72, -2)

* C/2023 A1 ( Leonard )

Now it is 16.0 mag (Mar. 10, Catalina Sky Survey). In the Northern Hemisphere, it stays observable at 16.5 mag in excellent condition from February to March. It locates low in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 18   7 39.25   53 10.4   1.274   1.835   107   16.7  19:56 (180, 72)  
Mar. 25   7 25.23   45 46.4   1.360   1.837   101   16.8  19:39 (158, 79)

* C/2023 B2 ( ATLAS )

Now it is 16.2 mag (Mar. 12, ATLAS South Africa). 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. 18  11 45.00  -51 40.5   0.955   1.745   127   16.8   0:06 (  0,  3)  
Mar. 25  11 51.25  -48 25.9   0.915   1.753   132   16.7  23:41 (  0,  7)

* 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. Appearing in the morning sky. 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. 18  19 20.18  -25 17.3   2.930   2.732    68   16.7   4:43 (319, 17)  
Mar. 25  19 29.25  -25  7.5   2.866   2.757    73   16.8   4:32 (320, 18)

* C/2019 E3 ( ATLAS )

Now it is 16.9 mag (Mar. 13, ATLAS Chile). 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. 18   4 58.07  -71 56.0  10.435  10.394    84   16.8  19:33 ( 11,-20)  
Mar. 25   4 56.39  -71 16.8  10.423  10.390    85   16.8  19:39 ( 14,-21)

* C/2023 E1 ( ATLAS )

Now it is 17.6 mag (Mar. 10, A. Diepvens). 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. 18  12 48.74   20 27.2   0.955   1.907   155   17.2   1:10 (  0, 75)  
Mar. 25  12 45.81   25 48.6   0.886   1.826   151   16.9   0:39 (  0, 80)

* C/2020 F2 ( ATLAS )

Now it is 16.8 mag (Mar. 12, ATLAS South Africa). 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. 18  13  8.12   10 10.7   8.000   8.932   158   17.0   1:29 (  0, 65)  
Mar. 25  13  3.62   10 46.3   7.982   8.938   162   17.0   0:57 (  0, 66)

* 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. 18  14 15.93    3 11.1   1.944   2.804   143   17.1   2:36 (  0, 58)  
Mar. 25  14 14.64    3 57.6   1.884   2.788   149   17.0   2:08 (  0, 59)

* 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. 18  13 16.53   51 19.6   2.519   3.214   126   17.1   1:37 (180, 74)  
Mar. 25  13 14.82   52 52.2   2.516   3.184   124   17.0   1:08 (180, 72)

* 204P/LINEAR-NEAT

It brightened rapidly. Now it is 16.2 mag (Feb. 27, Masayoshi Yoshimi). 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. 18   9 52.80   22 10.4   1.218   2.112   144   17.1  22:10 (  0, 77)  
Mar. 25   9 52.76   22  5.5   1.291   2.141   138   17.4  21:43 (  0, 77)

* 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. 18  20 28.75    2 41.9   2.211   1.747    50   17.1   4:43 (285, 25)  
Mar. 25  20 22.78    4 27.8   2.099   1.779    57   17.1   4:32 (287, 30)

* 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. 18   4 30.88    4  4.9   3.755   3.554    70   17.1  19:33 ( 60, 41)  
Mar. 25   4 37.51    4 39.4   3.851   3.561    65   17.2  19:39 ( 67, 37)

* 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 16.8 mag (Feb. 27, Masayoshi Yoshimi). In the Northern Hemisphere, it stays observable in excellent condition for a while. In the Southern Hemisphere, it will be unobservable soon. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 18   3 39.46   35 32.5   2.964   2.701    65   17.2  19:33 (107, 47)  
Mar. 25   3 52.46   36  9.3   3.064   2.727    61   17.3  19:39 (110, 43)

* 180P/NEAT

Now it is 17.5 mag (Mar. 10, A. Diepvens). 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. 18   9  9.58   38 14.0   1.874   2.609   128   17.2  21:27 (180, 87)  
Mar. 25   9  8.98   37 54.6   1.927   2.597   121   17.2  20:59 (180, 87)

* 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 17.9 mag (Mar. 9, ATLAS South Africa). 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 18   6 14.60   10 59.4   4.480   4.702    96   17.3  19:33 ( 33, 62)  
Mar. 25   6 17.34   11 11.3   4.607   4.723    90   17.4  19:39 ( 47, 58)

* 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. 18   2 37.10  -57 56.1  18.263  17.876    65   17.3  19:33 ( 32,-19)  
Mar. 25   2 39.49  -57 44.6  18.234  17.851    65   17.3  19:39 ( 35,-23)

* 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 17.4 mag (Mar. 11, A. Diepvens). 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. 18   9 55.43   30 45.2   3.875   4.683   140   17.3  22:13 (  0, 86)  
Mar. 25   9 53.17   31  3.0   3.962   4.703   133   17.4  21:43 (  0, 86)

* 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. 18  18 40.41   51 45.9   6.290   6.247    82   17.4   4:43 (225, 60)  
Mar. 25  18 44.56   53  2.9   6.303   6.281    84   17.5   4:32 (221, 62)

* 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. 18  18 33.37   71 58.7   9.779   9.791    87   17.5   4:43 (195, 49)  
Mar. 25  18 33.07   72 57.3   9.807   9.808    87   17.5   4:32 (192, 50)

* 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 17.2 mag (Mar. 7, ATLAS Chile). 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. 18  15 16.90   -0 15.3   6.453   7.107   127   17.6   3:37 (  0, 55)  
Mar. 25  15 14.05    0  7.7   6.305   7.045   134   17.5   3:07 (  0, 55)

* C/2021 S4 ( Tsuchinshan )

Now it is 17.4 mag (Feb. 16, Toshihiko Ikemura, Hirohisa Sato). It stays 17 mag for a long time from 2023 to 2024. It is observable in good condition in the Northern Hemisphere. In the Southern Hemisphere, it is not observable until July. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 18   2 46.04   28 58.0   7.517   6.951    52   17.6  19:33 (104, 34)  
Mar. 25   2 50.70   29 14.5   7.587   6.938    46   17.6  19:39 (108, 28)

* 99P/Kowal 1

It brightened up to 15.9 mag in 2022 spring (May 5, Toshiyuki Takahashi). Now it is 17.5 mag (Mar. 11, ATLAS South Africa). 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. 18  16 30.55  -24 15.6   4.488   4.875   107   17.7   4:43 (358, 31)  
Mar. 25  16 31.40  -24 23.8   4.393   4.881   113   17.7   4:24 (  0, 31)

* 244P/Scotti

Now it is 17.7 mag (Feb. 26, A. Diepvens). 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. 18   5 56.56   25 39.5   3.779   3.948    92   17.8  19:33 ( 66, 71)  
Mar. 25   6  0.81   25 35.2   3.886   3.951    86   17.8  19:39 ( 75, 65)

* 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. 18   3 34.54   13 54.7   2.760   2.388    58   17.8  19:33 ( 81, 37)  
Mar. 25   3 47.21   14 45.9   2.853   2.411    54   17.9  19:39 ( 86, 33)

* 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. 18  10 10.16   15 54.2   3.280   4.184   151   17.8  22:27 (  0, 71)  
Mar. 25  10  7.89   16  9.6   3.332   4.182   144   17.8  21:58 (  0, 71)

* 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. 18   4 44.11   71 30.8   3.028   3.124    86   17.9  19:33 (163, 49)  
Mar. 25   5  9.89   69 15.7   3.088   3.127    82   17.9  19:39 (160, 50)

* 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. 18   9 32.99   26 22.1   3.546   4.345   138   17.9  21:50 (  0, 81)  
Mar. 25   9 30.08   26 22.4   3.606   4.333   131   17.9  21:20 (  0, 81)

* 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. 18  18 55.68  -74 11.9   3.205   3.259    84   18.0   4:43 (349,-22)  
Mar. 25  19 21.11  -74 38.5   3.162   3.266    87   18.0   4:32 (349,-23)

* 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. 18   6 39.42  -16 10.4   0.654   1.299   101   19.3  19:33 ( 11, 39)  
Mar. 25   7  8.40   -3 23.4   0.759   1.389   103   19.8  19:39 ( 16, 51)

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