Weekly Information about Bright Comets (2024 Feb. 24: North)

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Updated on February 25, 2024
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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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* 12P/Pons-Brooks

It returns for the first time in 70 years. It will brighten up to 4.5 mag in spring. It suddenly brightened in major outburst by 5 mag up to 11.5 mag on July 20 (E. Tamas, Francois Kugel). It brightened again in another major outburst up to 9.4 mag on Nov. 15 (Nick James). Now it is 7.4 mag (Feb. 19, Virgilio Gonano). Brightening gradually. In the Northern Hemisphere, it will be unobservable in April. In the Southern Hemisphere, it is not observable now, but it will appear in April.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  23  8.16   36 50.6   1.726   1.289    47    7.7  19:14 (124, 17)  
Mar.  2  23 43.53   35 30.3   1.685   1.198    44    7.2  19:20 (122, 17)  

* C/2021 S3 ( PanSTARRS )

Now it is 10.2 mag (Feb. 14, Osamu Miyazaki). Fading gradually. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  17 53.04  -10 38.4   1.354   1.327    66    9.1   5:12 (315, 32)  
Mar.  2  18 13.33   -4 45.7   1.322   1.342    69    9.1   5:04 (311, 37)  

* 62P/Tsuchinshan 1

It brightened up to 7.4 mag from December to January (Dec. 24, Osamu Miyazaki). Now it is 8.9 mag (Feb. 13, Chris Wyatt). It will fade out rapidly after this. It will be fainter than 18 mag in June. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  12 40.93    9 57.7   0.523   1.455   146    9.5   2:29 (  0, 65)  
Mar.  2  12 37.07   10  7.0   0.542   1.496   153    9.9   1:58 (  0, 65)  

* 144P/Kushida

Now it is 10.5 mag (Feb. 16, Osamu Miyazaki). It will fade out rapidly after this. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   5 15.27   17 11.2   0.824   1.439   104   10.2  19:14 (  9, 72)  
Mar.  2   5 36.98   17 27.9   0.874   1.460   102   10.3  19:20 ( 18, 72)  

* C/2023 A3 ( Tsuchinshan-ATLAS )

It will approach to Sun down to 0.4 a.u. in late September, and it is expected to brighten up to 0 mag. Now it is 12.7 mag (Feb. 15, ATLAS Chile). It will brighten rapidly after this. It stays observable in good condition. 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)  
Feb. 24  15  8.41   -7 34.1   3.198   3.620   107   12.6   4:56 (  0, 47)  
Mar.  2  15  5.29   -7 18.0   2.997   3.535   115   12.4   4:26 (  0, 48)  

* C/2022 E2 ( ATLAS )

Now it is 12.1 mag (Feb. 16, Osamu Miyazaki). It stays 13 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable in June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   7 41.95   25  1.3   3.295   4.088   138   12.4  21:27 (  0, 80)  
Mar.  2   7 31.39   26 15.0   3.367   4.061   128   12.4  20:49 (  0, 81)  

* 473P/2023 W1 ( NEAT )

First return of a new periodic comet which brightened up to 10 mag in 2001. Now it is 13.1 mag (Feb. 10, Katsumi Yoshimoto). It will fade out rapidly after this. It locates somewhat low in the Northern Hemisphere. In the Southern Hemisphere, it will never be observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   0 13.24   27 44.0   1.905   1.406    45   12.7  19:14 (108, 24)  
Mar.  2   0 25.38   31 49.9   1.922   1.407    44   12.7  19:20 (115, 22)  

* C/2022 L2 ( ATLAS )

Now it is 14.1 mag (Feb. 12, Thomas Lehmann). It stays 13 mag for a while. In the Northern Hemisphere, it will be unobservable in June. In the Southern Hemisphere, it stays observable in good condition. It is expected to brighten up to 12.5 mag in spring. 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)  
Feb. 24  14 59.57  -30 41.8   2.300   2.699   102   13.0   4:48 (  0, 24)  
Mar.  2  14 44.90  -32 47.0   2.165   2.695   111   12.9   4:06 (  0, 22)  

* 207P/NEAT

Now it is 13.8 mag (Feb. 12, Hiroshi Abe). It will fade out rapidly after this. It will be fainter than 18 mag in May. It stays observable in good condition. Vladimir Bezugly reported it is visible at around 12 mag in the SOHO LASCO images in late January.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   4 21.94  -16 22.7   0.241   1.003    86   12.9  19:14 ( 19, 37)  
Mar.  2   5 32.72  -14 10.3   0.222   1.045    98   12.9  19:20 (  8, 41)  

* C/2020 V2 ( ZTF )

It was observed at 9-10 mag for a long time in 2023. Now it is 12.6 mag (Feb. 2, Chris Wyatt). It stays 14 mag for a while. In the Northern Hemisphere, it will never be observable after this. It locates somewhat low in the Southern Hemisphere. But it will become high in spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  23 40.96  -39 25.3   4.644   3.863    34   13.2  19:14 ( 55,-19)  
Mar.  2  23 45.53  -39 25.8   4.698   3.920    34   13.3  19:20 ( 58,-24)  

* 13P/Olbers

It returned for the first time in 68 years. It will brighten up to 7.5 mag in summer. Now it is 13.1 mag (Feb. 14, Alan Hale). It will brighten rapidly after this. In the Northern Hemisphere, it will be getting lower gradually. In the Southern Hemisphere, it will be unobservable in April. At the high light, it locates low in the Northern Hemisphere, or it is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   3  0.52    2  0.4   2.288   2.150    69   13.6  19:14 ( 55, 43)  
Mar.  2   3  5.77    4 29.7   2.302   2.076    64   13.3  19:20 ( 64, 39)  

* 29P/Schwassmann-Wachmann 1

Now it is 14.7 mag (Feb. 13, Chris Wyatt). It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   8 10.11   21 28.5   5.340   6.181   145   13.6  21:55 (  0, 76)  
Mar.  2   8  7.82   21 29.4   5.411   6.183   137   13.6  21:25 (  0, 76)  

* C/2017 K2 ( PanSTARRS )

It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 13.2 mag (Feb. 13, Chris Wyatt). Fading slowly. It will be getting lower gradually after this, and it will be unobservable in May in the Northern Hemisphere, or in June in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   5  6.59    5  2.2   4.806   5.087   100   13.6  19:14 ( 11, 60)  
Mar.  2   5  6.11    5 58.4   4.979   5.148    94   13.7  19:20 ( 27, 58)  

* C/2019 U5 ( PanSTARRS )

Now it is 13.9 mag (Feb. 2, Chris Wyatt). Fading slowly. In the Northern Hemisphere, it will be unobservable in May. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   8 20.23  -44 57.3   4.104   4.656   118   13.9  22:04 (  0, 10)  
Mar.  2   8  8.09  -44 10.4   4.164   4.693   116   14.0  21:24 (  0, 11)  

* C/2021 G2 ( ATLAS )

Now it is 14.6 mag (Feb. 13, Chris Wyatt). It stays 14 mag for a while. It locates somewhat low in the Northern Hemisphere. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  12 12.32  -38 45.0   4.574   5.210   125   14.0   2:01 (  0, 16)  
Mar.  2  12 10.42  -38 28.9   4.492   5.194   130   13.9   1:31 (  0, 16)  

* 32P/Comas Sola

Now it is 13.8 mag (Feb. 13, Chris Wyatt). It stays 14 mag for a while. In the Northern Hemisphere, it stays observable in good condition. It stays extremely low in the Southern Hemisphere. But it will become high in winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   3 33.41   24 43.9   1.971   2.087    82   13.9  19:14 ( 75, 63)  
Mar.  2   3 45.61   25 37.1   2.031   2.073    78   14.0  19:20 ( 82, 60)  

* C/2023 S3 ( Lemmon )

It must have brightened up to 11 mag in winter. However, it was too low to observe at the high light. Fading rapidly. It will be fainter than 18 mag in April. It will be getting higher gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  19 46.23  -31 21.5   1.535   1.050    42   14.1   5:12 (309, -1)  
Mar.  2  19 33.72  -29 45.3   1.434   1.128    51   14.9   5:04 (312,  5)  

* C/2021 T4 ( Lemmon )

It brightened up to 7.8 mag in late July (July 20, Thomas Lehmann). Now it is 15.8 mag (Feb. 21, Thomas Lehmann). Fading gradually. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  14 37.71    6 43.1   2.474   3.061   117   14.3   4:26 (  0, 62)  
Mar.  2  14 26.00    8 59.1   2.432   3.131   127   14.4   3:47 (  0, 64)  

* 103P/Hartley 2

It approached to Earth down to 0.38 a.u., and brightened up to 8.0 mag in autumn (Sept. 29, Virgilio Gonano). Now it is 14.5 mag (Feb. 9, Toshihiko Ikemura, Hirohisa Sato). Fading rapidly. It will be fainter than 18 mag in May. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   7 59.62   -4 26.7   1.109   1.978   140   14.4  21:45 (  0, 51)  
Mar.  2   7 59.85   -2 52.0   1.208   2.040   135   14.8  21:18 (  0, 52)  

* C/2019 L3 ( ATLAS )

It brightened up to 8.3 mag in 2021-2022 winter (Jan. 6, 2022, Toshiyuki Takahashi). Now it is 14.0 mag (Feb. 16, G. Duszanowicz). It stays 15 mag for a while. In the Northern Hemisphere, it will be unobservable in May. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  11  8.51  -54  0.0   6.898   7.378   115   14.4   0:57 (  0,  1)  
Mar.  2  11  4.05  -54  7.2   6.898   7.423   118   14.5   0:25 (  0,  1)  

* 479P/2023 WM26 ( Elenin )

First return of a new periodic comet which was discovered in 2011, half a year after the perihelion passage. It is expected to brighten up to 14 mag in spring. Now it is 15.3 mag (Feb. 9, Toshihiko Ikemura, Hirohisa Sato). It stays 14 mag for a while. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   7 53.11    4 36.7   0.658   1.561   141   15.0  21:38 (  0, 59)  
Mar.  2   7 46.38    2 35.6   0.644   1.509   133   14.8  21:04 (  0, 57)  

* C/2023 V4 ( Camarasa-Duszanowicz )

It is expected to brighten up to 12 mag in early summer. Now it is 15.2 mag (Feb. 16, ATLAS-HKO, Haleakala). Brightening gradually. It locates somewhat low in the Northern Hemisphere. In the Southern Hemisphere, it will be unobservable in April. At the high light, it is not observable in the Southern Hemisphere, or it locates low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   2 10.35   -8 40.1   2.232   1.858    55   15.2  19:14 ( 57, 26)  
Mar.  2   2 15.30   -4 52.5   2.236   1.780    50   15.0  19:20 ( 65, 24)  

* 46P/Wirtanen

The condition is bad in this apparition. It brightens up to 10 mag in early summer, however, it is not observable at all. Brightening rapidly. It will never be observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  23 39.01  -10  7.6   2.427   1.517    18   15.6  19:14 ( 80, -3)  
Mar.  2  23 57.28   -7 52.3   2.385   1.460    16   15.1  19:20 ( 84, -5)  

* C/2020 K1 ( PanSTARRS )

It brightened up to 12.1 mag in 2023 spring (May 20, Jose Guilherme de S. Aguiar). Now it is 15.0 mag (Feb. 13, Chris Wyatt). Fading slowly. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   4  2.37  -64 33.8   4.218   4.138    78   15.2  19:14 (  9,-11)  
Mar.  2   4  8.72  -62  5.9   4.263   4.181    78   15.3  19:20 ( 13,-10)  

* C/2023 C2 ( ATLAS )

It is expected to brighten up to 12.5 mag in summer. Now it is 15.8 mag (Feb. 7, Thomas Lehmann). Brightening gradually. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it stays observable in good condition. Around the high light, it is observable in good condition in the Southern Hemisphere, but it locates very low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  15 53.61  -68 35.3   3.674   3.699    83   15.5   5:12 (357,-14)  
Mar.  2  16  6.02  -69 44.8   3.559   3.647    87   15.4   5:04 (358,-15)  

* 227P/Catalina-LINEAR

Now it is 14.7 mag (Feb. 12, Yukihiro Sugiyama). It will fade out rapidly after this. It will be fainter than 18 mag in May. In the Northern Hemisphere, it stays observable in good condition. It locates somewhat low in the Southern Hemisphere. But it will become high in spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   7 30.65   37 27.1   0.791   1.629   132   15.4  21:17 (180, 88)  
Mar.  2   7 37.13   36 23.8   0.823   1.625   126   15.5  20:56 (180, 89)  

* C/2019 T4 ( ATLAS )

It brightened up to 11.1 mag in early 2022 (Mar. 31, 2022, F. Kugel, J.-G. Bosch, J. Nicolas). Now it is 15.3 mag (Feb. 9, Toshihiko Ikemura, Hirohisa Sato). It stays 16 mag for a while. In the Northern Hemisphere, it stays observable in good condition. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  17 37.11   21 46.0   6.679   6.536    77   15.5   5:12 (286, 58)  
Mar.  2  17 40.15   22 37.7   6.643   6.575    81   15.5   5:04 (288, 62)  

* C/2023 H2 ( Lemmon )

It approached to Earth down to 0.2 a.u. in early November, and brightened up to 6.2 mag (Nov. 11, Marco Goiato). Now it is 14.4 mag (Feb. 5, Thomas Lehmann). Fading gradually. It will be fainter than 18 mag in May. In the Northern Hemisphere, it will never be observable after this. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   0 18.03  -43 59.7   2.736   2.106    41   15.7  19:14 ( 47,-16)  
Mar.  2   0 27.60  -44 19.6   2.820   2.195    42   16.0  19:20 ( 49,-19)  

* C/2023 P1 ( Nishimura )

It approached to Sun down to 0.23 a.u. and brightened up to 2.5 mag in mid September (Sept. 18, Juan Jose Gonzalez). Now it is 17.0 mag (Feb. 13, ATLAS South Africa). Fading gradually. It will be fainter than 18 mag in May. It stays extremely low in the Northern Hemisphere. In the Southern Hemisphere, it stays observable in good condition. Thomas Lehmann reported it was bright as 14.1 mag on Feb. 4.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   9  8.44  -53 31.8   2.457   3.006   114   15.7  22:51 (  0,  2)  
Mar.  2   8 50.91  -51 19.7   2.534   3.099   115   15.9  22:07 (  0,  4)  

* C/2022 QE78 ( ATLAS )

Now it is 15.9 mag (Feb. 12, Hirohisa Sato). It stays 16 mag for a while. It will be getting lower gradually after this, and it will be unobservable in May in the Northern Hemisphere, or in June in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   4 29.92   -6 57.9   6.756   6.826    89   15.8  19:14 ( 21, 46)  
Mar.  2   4 31.34   -6 14.5   6.827   6.797    84   15.8  19:20 ( 32, 44)  

* 65P/Gunn

It will be observable at 15-16 mag from 2024 to 2025. Now it is 17.1 mag (Feb. 11, Toshihiko Ikemura, Hirohisa Sato). It stays 16 mag for a while. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  13 18.05    2 12.0   2.863   3.645   136   15.9   3:06 (  0, 57)  
Mar.  2  13 16.06    2 32.2   2.782   3.629   143   15.8   2:37 (  0, 57)  

* C/2014 UN271 ( Bernardinelli-Bernstein )

Very large comet. It is expected to brighten up to 13 mag in 2031. Now it is 15.8 mag (Feb. 8, Thomas Lehmann). It stays 16 mag for a while. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it stays observable in good condition. In the Northern Hemisphere, it is not observable until 2030.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   2 55.17  -63 10.5  16.954  16.660    71   15.9  19:14 ( 17,-13)  
Mar.  2   2 56.97  -62 52.8  16.936  16.636    70   15.9  19:20 ( 20,-15)  

* 125P/Spacewatch

It is expected to brighten up to 15.5 mag from March to April. Now it is 16.8 mag (Feb. 12, ATLAS-HKO, Haleakala). Fading slowly. It locates somewhat low in the Northern Hemisphere. But it will become high in spring. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  17 55.55  -14 16.8   1.640   1.532    65   16.2   5:12 (317, 29)  
Mar.  2  18 17.16  -13 53.7   1.598   1.528    67   15.9   5:04 (316, 29)  

* C/2022 S4 ( Lemmon )

Now it is 16.4 mag (Feb. 5, ATLAS Chile). It stays 16 mag for a while. In the Northern Hemisphere, it will be unobservable in March. It locates somewhat low in the Southern Hemisphere. But it will become high in summer. The brightness evolution is slower than originally expected.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   1 49.46  -30 44.5   3.655   3.138    51   16.0  19:14 ( 45,  7)  
Mar.  2   1 53.82  -30 48.4   3.672   3.105    48   16.0  19:20 ( 49,  2)  

* 226P/Pigott-LINEAR-Kowalski

Now it is 16.1 mag (Feb. 11, ATLAS-MLO, Mauna Loa). It will fade out rapidly after this. It will be fainter than 18 mag in April. In the Northern Hemisphere, it will be getting lower gradually. In the Southern Hemisphere, it will be unobservable in March.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   1 58.09   18 44.1   2.148   1.856    59   16.3  19:14 ( 85, 41)  
Mar.  2   2  9.87   21 33.5   2.233   1.876    56   16.5  19:20 ( 92, 38)  

* C/2022 T1 ( Lemmon )

Now it is 16.4 mag (Feb. 11, Toshihiko Ikemura, Hirohisa Sato). It stays 16 mag for a while. It locates somewhat low in the Northern Hemisphere. But it will become high in summer. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  14 10.63  -28 47.7   2.931   3.445   113   16.4   3:59 (  0, 26)  
Mar.  2  14 13.18  -28 49.5   2.848   3.447   119   16.3   3:34 (  0, 26)  

* 150P/LONEOS

Now it is 15.8 mag (Feb. 13, Yukihiro Sugiyama). Fading gradually. It will be fainter than 18 mag in May. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   8 41.02  -16  0.5   0.857   1.754   143   16.4  22:26 (  0, 39)  
Mar.  2   8 38.22  -16 29.4   0.873   1.749   139   16.5  21:55 (  0, 38)  

* C/2023 F3 ( ATLAS )

Now it is 17.4 mag (Feb. 14, ATLAS South Africa). It stays 16 mag for a while. It stays extremely low in the Northern Hemisphere. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  16 53.23  -46 41.1   5.920   5.798    78   16.5   5:12 (345,  6)  
Mar.  2  16 50.76  -47 26.0   5.778   5.775    84   16.4   5:04 (349,  6)  

* C/2021 Y1 ( ATLAS )

It brightened up to 13 mag in early 2023. It stays 17 mag for a while. It stays extremely low in the Northern Hemisphere. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  16 35.93  -47 52.3   3.941   3.910    80   16.4   5:12 (348,  6)  
Mar.  2  16 36.74  -47 46.1   3.893   3.969    87   16.4   5:04 (351,  6)  

* C/2024 A2 ( ATLAS )

Now it is 17.5 mag (Feb. 16, ATLAS Chile). It stays 17 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in March. In the Southern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in June. But it will be observable again in March.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   7 37.08  -80 41.7   1.833   2.039    87   16.9  21:11 (  0,-25)  
Mar.  2   6 20.35  -74 33.8   1.768   2.008    88   16.8  19:34 (  0,-19)  

* C/2022 U3 ( Bok )

Now it is 16.9 mag (Feb. 7, Toshihiko Ikemura, Hirohisa Sato). It stays 17 mag for a while. It will be unobservable in May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   4 39.18   28 31.7   4.748   4.977    97   16.8  19:14 ( 61, 78)  
Mar.  2   4 42.20   27 59.1   4.843   4.964    91   16.9  19:20 ( 73, 72)  

* C/2019 E3 ( ATLAS )

Very far object. Now it is 17.0 mag (Jan. 27, ATLAS Chile). It stays 17 mag for a while. In the Northern Hemisphere, it is not observable now.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   2 12.48  -68 28.6  10.639  10.327    69   16.8  19:14 ( 17,-20)  
Mar.  2   2 13.67  -67 43.3  10.640  10.329    69   16.8  19:20 ( 20,-21)  

* 30P/Reinmuth 1

Now it is 17.0 mag (Feb. 9, Toshihiko Ikemura, Hirohisa Sato). Brightening slowly. It will be unobservable in May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   2 14.89    6 56.0   2.710   2.367    59   17.0  19:14 ( 69, 38)  
Mar.  2   2 25.01    8  7.2   2.749   2.332    55   17.0  19:20 ( 75, 34)  

* C/2022 R6 ( PanSTARRS )

Now it is 16.9 mag (Feb. 17, ATLAS Chile). It stays 17 mag for a while. In the Northern Hemisphere, it will be unobservable in April. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   4 47.20  -34 53.7   7.469   7.513    88   17.0  19:14 (  9, 20)  
Mar.  2   4 48.69  -34  1.2   7.507   7.491    85   17.0  19:20 ( 16, 19)  

* 471P/2023 KF3

Now it is 16.5 mag (Jan. 31, Thomas Lehmann). It will fade out rapidly after this. It will be fainter than 18 mag in April. It locates somewhat low in the Northern Hemisphere. In the Southern Hemisphere, it will be unobservable in March.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   1 25.08   12 32.4   2.714   2.210    49   17.0  19:14 ( 84, 31)  
Mar.  2   1 39.73   13 46.6   2.789   2.228    46   17.2  19:20 ( 88, 28)  

* C/2021 S4 ( Tsuchinshan )

Now it is 17.0 mag (Feb. 13, ATLAS-HKO, Haleakala). It stays 17 mag for a while. It will be unobservable in April in the Southern Hemisphere, or in June in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   4 35.74   39 49.0   6.485   6.698    98   17.1  19:14 (119, 79)  
Mar.  2   4 38.25   39 38.0   6.593   6.701    91   17.1  19:20 (112, 73)  

* C/2023 K1 ( ATLAS )

It brightened very rapidly up to 14.9 mag in early summer (July 13, Taras Prystavski). Now it is 17.2 mag (Jan. 16, Ken-ichi Kadota). Fading gradually. It will be fainter than 18 mag in April. In the Northern Hemisphere, it stays observable in good condition. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  14 36.86   21  8.2   2.223   2.835   118   17.2   4:25 (  0, 76)  
Mar.  2  14 25.29   25 11.7   2.192   2.889   126   17.2   3:46 (  0, 80)  

* C/2023 R2 ( PanSTARRS )

Now it is 17.5 mag (Feb. 12, Toshihiko Ikemura, Hirohisa Sato). It will brighten rapidly after this. It will be unobservable in April in the Northern Hemisphere, or in June in the Southern Hemisphere. It will brighten up to 11 mag in summer. But it is not observable at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   2 28.09   -5 53.1   3.111   2.755    60   17.4  19:14 ( 55, 31)  
Mar.  2   2 34.23   -5  7.7   3.108   2.671    55   17.2  19:20 ( 62, 27)  

* C/2023 T3 ( Fuls )

Now it is 17.1 mag (Feb. 12, Yukihiro Sugiyama). It stays 17 mag for a while. In the Northern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in June. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   7 46.38   -9  3.0   3.873   4.637   136   17.3  21:31 (  0, 46)  
Mar.  2   7 44.45   -8 44.8   3.892   4.599   130   17.3  21:02 (  0, 46)  

* 299P/Catalina-PanSTARRS

Now it is 17.1 mag (Feb. 7, Toshihiko Ikemura, Hirohisa Sato). It stays 17 mag for a while. It locates somewhat low in the Northern Hemisphere. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  15 47.04  -28 40.5   2.955   3.174    93   17.4   5:12 (354, 26)  
Mar.  2  15 52.26  -29  2.2   2.855   3.170    99   17.3   5:04 (358, 26)  

* 478P/2023 Y3 ( ATLAS )

Now it is 17.5 mag (Jan. 29, D. Buczynski). Fading slowly. It will be fainter than 18 mag in May. In the Northern Hemisphere, it stays observable in good condition. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   6 45.92   20 41.6   1.715   2.434   126   17.3  20:32 (  0, 76)  
Mar.  2   6 47.80   21 21.9   1.779   2.426   119   17.4  20:06 (  0, 76)  

* C/2023 H5 ( Lemmon )

Now it is 17.2 mag (Feb. 9, Jean-Claude Merlin). It stays 17 mag for a while. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  10 46.01    5 44.5   4.868   5.852   173   17.4   0:35 (  0, 61)  
Mar.  2  10 41.37    6 58.3   4.826   5.816   177   17.4   0:03 (  0, 62)  

* C/2022 A3 ( Lemmon-ATLAS )

Now it is 17.6 mag (Feb. 5, ATLAS South Africa). It stays 18 mag for a while. In the Northern Hemisphere, it will never be observable after this. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   4 50.93  -69  7.5   3.925   3.930    83   17.4  19:14 (  4,-14)  
Mar.  2   4 37.85  -67 42.8   3.965   3.951    81   17.5  19:20 (  8,-14)  

* 216P/LINEAR

Now it is 18.3 mag (Feb. 12, Toshihiko Ikemura, Hirohisa Sato). It will fade out rapidly after this. It will be fainter than 18 mag in March. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  12 12.12    1 41.7   1.235   2.161   152   17.5   2:01 (  0, 57)  
Mar.  2  12  8.02    1 25.4   1.212   2.171   160   17.6   1:29 (  0, 56)  

* C/2020 F2 ( ATLAS )

Now it is 17.3 mag (Feb. 3, ATLAS-MLO, Mauna Loa). It stays 18 mag for a while. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24  12  9.59   18 24.9   8.555   9.450   153   17.5   1:58 (  0, 73)  
Mar.  2  12  5.38   18 58.6   8.534   9.464   158   17.6   1:26 (  0, 74)  

* C/2024 A1 ( ATLAS )

Now it is 17.5 mag (Feb. 9, Jean-Claude Merlin). It stays 17 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in March. In the Southern Hemisphere, it stays observable in good condition. It stays 15 mag for a long time from late 2024 to early 2026.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   6  6.36  -57 18.7   5.405   5.574    94   17.6  19:51 (  0, -2)  
Mar.  2   6  3.58  -55 34.6   5.378   5.535    93   17.6  19:21 (  0,  0)  

* C/2022 V2 ( Lemmon )

Now it is 17.2 mag (Feb. 11, ATLAS South Africa). Fading gradually. It will be fainter than 18 mag in March. It locates somewhat low in the Northern Hemisphere. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   8 11.37  -36 19.5   1.746   2.442   124   17.8  21:54 (  0, 19)  
Mar.  2   7 49.29  -35 55.0   1.845   2.484   119   17.9  21:05 (  0, 19)  

* 170P/Christensen

Now it is 17.2 mag (Feb. 11, ATLAS Chile). Fading slowly. It will be fainter than 18 mag in March. In the Northern Hemisphere, it will be getting lower gradually. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   3 39.23    9 43.7   3.377   3.357    80   17.8  19:14 ( 51, 55)  
Mar.  2   3 45.28   10 25.2   3.490   3.374    75   17.9  19:20 ( 60, 51)  

* C/2022 E3 ( ZTF )

It approached to Earth down to 0.29 a.u. in early last February, and it brightened up to 4.5 mag (Feb. 1, Juan Jose Gonzalez). Now it is 17.7 mag (Feb. 7, Thomas Lehmann). Fading slowly. It will be fainter than 18 mag in March. In the Northern Hemisphere, it will never be observable after this. In the Southern Hemisphere, it will be getting lower gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 24   3  0.33  -52 16.7   5.428   5.161    69   17.8  19:14 ( 22, -3)  
Mar.  2   3  1.57  -51 16.3   5.529   5.228    67   17.9  19:20 ( 27, -5)  

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