Weekly Information about Bright Comets (2020 Feb. 15: South)

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Updated on February 17, 2020
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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 T2 ( PanSTARRS )

Now it is 9.0 mag (Feb. 14, Carlos Labordena). It brightens up to 8 mag in spring, and 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)  
Feb. 15   2  6.37   59 13.2   1.689   1.934    88    8.9  20:26 (153,-16)  
Feb. 22   2  6.01   60  5.5   1.716   1.886    83    8.8  20:16 (152,-19)  

* C/2019 Y1 ( ATLAS )

Now it is bright as 10.8 mag (Feb. 14, Carlos Labordena). It approaches to Sun down to 0.84 a.u. in March, then it brightens up to 10 mag. In the Northern Hemisphere, it stays observable for a long time, although it becomes extremely low in March. In the Southern Hemisphere, it is not observable until June when it fades down to 13 mag. It seems to be a fragment of C/1988 A1 (Liller), like C/1996 Q1 (Tabur) and C/2015 F3 (SWAN).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  23 50.10    5 16.1   1.636   0.999    34   11.1  20:26 ( 93, -6)  
Feb. 22  23 53.38   10 57.5   1.614   0.936    32   10.8  20:16 ( 95,-12)  

* C/2020 A2 ( Iwamoto )

Now it is very bright as 10.9 mag (Jan. 31, Seiichi Yoshida). It stays 11 mag until February. In the Northern Hemisphere, it stays observable in good condition after this. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  19  1.11   52  5.9   0.942   1.171    74   11.1   4:01 (221,-22)  
Feb. 22  19 55.73   66 15.2   0.913   1.239    81   11.2   4:10 (208,-29)  

* C/2018 N2 ( ASASSN )

Now it is 12.4 mag (Jan. 29, Maik Meyer). It stays bright as 12-13 mag until summer. But it becomes low in spring. In the Southern Hemisphere, it will never be observable again.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  23 45.28   44 15.1   3.590   3.260    62   12.4  20:26 (127,-27)  
Feb. 22  23 50.40   45 23.8   3.666   3.280    59   12.4  20:16 (127,-29)  

* C/2019 Y4 ( ATLAS )

Brightening very rapidly. Now it is very bright as 14.0 mag (Feb. 15, Michael Jager). It moves along the same orbit as C/1844 Y1 (Great Comet). It approaches to Sun down to 0.25 a.u. on May 30. It is expected to brighten up to 3 mag. In the Northern Hemisphere, it stays observable in excellent condition until mid May when it brightens up to 6 mag. In the Southern Hemisphere, it will be unobservable soon.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  11 37.53   49 41.9   1.409   2.238   137   13.7   2:02 (180,  6)  
Feb. 22  11 24.91   53 49.5   1.314   2.130   134   13.4   1:22 (180,  1)  

* 29P/Schwassmann-Wachmann 1

It brightened in outburst on Feb. 3. Now it is bright as 12.0 mag (Feb. 4, Bob King). It is already unobservable in the Southern Hemisphere. It will be unobservable in mid March also in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15   0 50.28   14 14.7   6.343   5.789    52   13.7  20:26 (108,  1)  
Feb. 22   0 54.85   14 37.3   6.429   5.790    46   13.8  20:16 (107, -2)  

* C/2018 F4 ( PanSTARRS )

Now it is bright as 13.8 mag (Dec. 28, Chris Wyatt). It stays 14 mag until spring. It stays observable for a long time in the Southern Hemisphere. It is not observable until August in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15   1  4.86  -64 11.7   3.875   3.506    61   14.2  20:26 ( 32, 38)  
Feb. 22   1 15.43  -61 27.6   3.904   3.519    60   14.2  20:16 ( 36, 36)  

* C/2019 K1 ( ATLAS )

In the Southern Hemisphere, it is observable at 14.5 mag from winter to spring. In the Northern Hemisphere, it is not observable until August when it fades down to 17 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15   0 40.52  -67 13.3   2.299   2.013    60   14.3  20:26 ( 28, 36)  
Feb. 22   1 20.94  -62 59.6   2.288   2.016    61   14.3  20:16 ( 34, 37)  

* 246P/NEAT

Now it is 16.2 mag (Feb. 2, C. Bell). It will brighten up to 13.5-14 mag from 2020 to 2021. It stays observable in good condition for a long time after this until 2020 summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  13 17.30   13 29.4   2.722   3.440   129   14.9   3:41 (180, 42)  
Feb. 22  13 16.57   14  4.8   2.639   3.423   136   14.8   3:13 (180, 41)  

* C/2019 N1 ( ATLAS )

Now it is 15.6 mag (Jan. 4, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 10.5 mag from 2020 December to 2021 January. In the Northern Hemisphere, it stays observable in good condition while the comet will be brightening gradually, but it is not observable at the high light. In the Southern Hemisphere, it is not observable for a long time, but it will be observable in good condition after the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  18 33.27   63 36.1   3.795   3.845    85   15.2   4:01 (208,-24)  
Feb. 22  18 38.03   64 45.7   3.723   3.780    85   15.1   4:10 (205,-22)  

* 114P/Wiseman-Skiff

Now it is 14.1 mag (Jan. 12, Sandor Szabo). It will be fading after this, and will be fainter than 18 mag in May. In the Northern Hemisphere, it is observable in excellent condition. It locates low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15   4 18.69   15 46.3   1.114   1.612   100   15.4  20:26 (149, 33)  
Feb. 22   4 35.34   14 55.5   1.181   1.628    96   15.6  20:16 (149, 34)  

* C/2018 A6 ( Gibbs )

Now it is 14.6 mag (Dec. 28, Chris Wyatt). It will be fading slowly after this. In the Southern Hemisphere, it becomes low from February to March, but it stays observable for a long time. In the Northern Hemisphere, it is not observasble until June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  23  1.15  -45 43.9   4.307   3.555    35   15.6  20:26 ( 44, 15)  
Feb. 22  23  8.36  -44  1.4   4.349   3.586    35   15.7  20:16 ( 44, 12)  

* 390P/2019 U1 ( Gibbs )

First return of a new periodic comet discovered in 2006. It brightened up to 14.9 mag in January (Jan. 21, R. Fichtl). It will never be observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  23 30.65  -10 11.6   2.596   1.746    24   15.7  20:26 ( 77, -1)  
Feb. 22  23 49.52   -8 50.6   2.601   1.730    22   15.6  20:16 ( 78, -1)  

* C/2016 M1 ( PanSTARRS )

It brightened up to 7.7 mag in June in 2018 (June 19, Juan Jose Gonzalez). Now it is fading. It has already faded down to 15.8 mag (Jan. 31, Kunihiro Shima). In the Southern Hemisphere, it stays observable for a long time until the comet will fade out. In the Northern Hemisphere, it stays low for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15   5 33.87  -25 31.8   5.624   5.980   106   15.7  20:26 (143, 78)  
Feb. 22   5 32.02  -24 16.0   5.751   6.035   102   15.8  20:16 (131, 75)  

* A/2019 U6

Now it is very bright as 14.4 mag (Feb. 14, Taras Prystavski). Taras Prystavski reported it has a coma of 1.5 arcmin. It will approach to Sun down to 0.9 a.u. in June, and it is extected to brighten up to 10 mag. In the Southern Hemisphere, it stays observable in good condition for a long time after this. In the Northern Hemisphere, it will be unobservable from late March to late June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15   3 56.33  -26 57.5   2.041   2.194    85   16.0  20:26 ( 98, 61)  
Feb. 22   3 55.22  -26 29.7   2.034   2.106    80   15.8  20:16 ( 95, 57)  

* C/2018 W2 ( Africano )

It brightened up to 8.3 mag in September (Sept. 20, Maik Meyer). Now it is fading. It has already faded down to 14.9 mag (Dec. 28, Chris Wyatt). In the Southern Hemisphere, it stays observable for a long time after this. In the Northern Hemisphere, it will never be observable again.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  22 55.89  -48 45.7   3.311   2.607    38   15.8  20:26 ( 41, 16)  
Feb. 22  23  5.66  -49 20.0   3.359   2.678    40   16.0  20:16 ( 40, 15)  

* C/2017 B3 ( LINEAR )

Now it is 14.8 mag (Dec. 28, Chris Wyatt). Fading slowly. It will be unobservable soon. It will appear in the morning sky 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. 15  23 32.07  -16 52.5   5.943   5.062    24   15.8  20:26 ( 72,  3)  
Feb. 22  23 36.88  -15 44.4   6.018   5.099    19   15.9  20:16 ( 71,  0)  

* 68P/Klemola

Now it is 15.6 mag (Jan. 7, Hidetaka Sato). Fading slowly. It is already unobservable in the Southern Hemisphre. It will be unobservable in early March also in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15   0  1.42   -2 52.0   2.792   2.047    33   15.8  20:26 ( 87,  1)  
Feb. 22   0 17.24   -1 31.1   2.865   2.080    30   16.0  20:16 ( 88,  0)  

* C/2017 K2 ( PanSTARRS )

Now it is 15.3 mag (Jan. 5, Toshihiko Ikemura, Hirohisa Sato). It is expected to be observable at 5-6 mag for a long time from 2022 to 2023. In the Northern Hemisphere, it is not observable at the high light from 2022 summer to 2023 summer. In the Southern Hemisphere, it stays unobservable for a while. But it will be observable in good condition at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  18 10.88   46 35.7   9.976   9.806    77   15.9   4:01 (221,-12)  
Feb. 22  18 13.29   46 59.6   9.896   9.757    79   15.9   4:10 (216, -8)  

* C/2019 F1 ( ATLAS-Africano )

Now it is 16.2 mag (Feb. 5, C. Rinner, F. Kugel). It will brighten up to 13 mag in 2021. In 2020, it is observable at 15 mag in good condition from spring to summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  15  2.42  -15 18.1   5.368   5.591    97   16.1   4:01 (230, 63)  
Feb. 22  15  2.65  -15 48.7   5.212   5.548   104   16.0   4:10 (213, 68)  

* 160P/LINEAR

Now it is 14.9 mag (Jan. 20, Toshihiko Ikemura, Hirohisa Sato). It will fade out rapidly after this, and it will be fainter than 18 mag in late March. In the Southern Hemisphere, it is already unobservable.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  23 56.02    8 58.4   2.594   1.916    38   16.2  20:26 ( 96, -7)  
Feb. 22   0 11.82   10 59.8   2.656   1.939    35   16.5  20:16 ( 98, -8)  

* 2I/2019 Q4 ( Borisov )

Now it is 16.2 mag (Jan. 21, Thomas Lehmann). The orbit is extremely hyperbolic with e=3.35. It is the first interstellar comet in history. It will be fading after this, and will be fainter than 18 mag in April. In the Southern Hemisphere, it is observable in excellent condition. In the Northern Hemisphere, it will never be observable again.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  12 54.98  -61  8.3   2.187   2.513    97   16.2   3:19 (  0, 64)  
Feb. 22  12 57.56  -63 33.1   2.249   2.608    99   16.4   2:54 (  0, 61)  

* 88P/Howell

Now it is 17.2 mag (Feb. 2, C. Rinner, F. Kugel). It will brighten very rapidly after this. It will brighten up to 8-9 mag from summer to autumn. It will be observable in excellent condition in the Southern Hemisphere. It locates very low around the high light in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  13 40.78   -5 33.4   1.894   2.536   119   16.6   4:01 (182, 61)  
Feb. 22  13 42.66   -5 36.6   1.772   2.491   126   16.3   3:39 (180, 61)  

* C/2017 M4 ( ATLAS )

It will be fading slowly after this. In the Southern Hemisphere, it stays observable in good condition for a long time. It will never be observable after this in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  13 57.28  -72 37.2   4.825   4.850    85   16.3   4:01 (357, 52)  
Feb. 22  13 38.83  -74  2.7   4.797   4.895    89   16.3   3:36 (  0, 51)  

* 78P/Gehrels 2

Now it is 16.3 mag (Jan. 19, Toshihiko Ikemura, Hirohisa Sato). It will be fading gradually 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)  
Feb. 15   9  4.56    7 41.0   2.118   3.090   167   16.3  23:24 (180, 47)  
Feb. 22   8 59.60    8 15.0   2.172   3.122   160   16.5  22:52 (180, 47)  

* C/2019 C1 ( ATLAS )

Now it is 16.5 mag (Dec. 27, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 17 mag from 2020 to 2021. It locates somewhat low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  10 54.96  -25  9.1   5.829   6.603   138   16.5   1:19 (180, 80)  
Feb. 22  10 53.07  -24 54.1   5.778   6.600   143   16.5   0:49 (180, 80)  

* 101P/Chernykh

Now it is 15.5 mag (Jan. 20, Toshihiko Ikemura, Hirohisa Sato). It will be fading slowly after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15   1 36.78    5 37.1   2.713   2.363    59   16.6  20:26 (109, 15)  
Feb. 22   1 49.05    6 57.9   2.789   2.371    55   16.7  20:16 (109, 13)  

* 124P/Mrkos

Now it is 17.2 mag (Feb. 2, D. Buczynski). It will brighten up to 16 mag in March, and it will be observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  11 36.76   43 13.0   0.894   1.780   142   16.8   2:01 (180, 12)  
Feb. 22  11 22.80   42  2.9   0.850   1.757   145   16.7   1:20 (180, 13)  

* A/2017 U7

It looks cometary on the LCO (CTIO) image on Aug. 21. Now it is 16.2 mag (Oct. 2, ATLAS-MLO, Mauna Loa). It is appearing in the mornign sky in the Southern Hemisphere. It will be observable in late March also in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  20  6.66  -31 26.4   7.339   6.505    30   16.7   4:01 (300, 12)  
Feb. 22  20  8.23  -31  9.6   7.282   6.513    36   16.7   4:10 (296, 18)  

* 155P/Shoemaker 3

Now it is 15.6 mag (Jan. 22, Thomas Lehmann). It will fade out rapidly after this, and it will be fainter than 18 mag in March.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  11 27.91   14 36.8   1.112   2.055   156   16.7   1:52 (180, 41)  
Feb. 22  11 24.67   15 19.9   1.125   2.091   163   17.1   1:21 (180, 40)  

* C/2010 U3 ( Boattini )

Now it is 17.7 mag (Feb. 2, D. Buczynski). It stays 16-17 mag for a long time until 2020. It is observable in good condition in the Northern Hemisphere. In the Southern Hemisphere, it is observable in the extremely low sky only in 2021 spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  13 27.94   55  5.1   8.153   8.699   120   16.8   3:51 (180,  0)  
Feb. 22  13 25.70   55 25.2   8.142   8.709   122   16.8   3:22 (180,  0)  

* C/2018 U1 ( Lemmon )

Now it is 16.7 mag (Dec. 3, D. Buczynski). It will stay at 14 mag for a long time from 2021 to 2022. In the Northern Hemisphere, it stays observable in good condition while brightening gradually. In the Southern Hemisphere, it is not observable until March.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  19  7.91   29 46.5   7.313   6.842    58   16.8   4:01 (241,-11)  
Feb. 22  19 10.23   29 56.5   7.238   6.809    60   16.8   4:10 (237, -5)  

* P/2019 Y2 ( Fuls )

Now it is 16.8 mag (Feb. 2, Catalina Sky Survey). It will brighten up to 16.5 mag and will be observable in good condition in March.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  13 29.04   -1 26.5   1.412   2.128   124   17.0   3:52 (180, 57)  
Feb. 22  13 31.91   -1 25.9   1.353   2.131   130   16.9   3:28 (180, 57)  

* C/2019 F2 ( ATLAS )

Fading. Now it is 17.2 mag (Dec. 28, Hidetaka Sato). It is observable at 17 mag in good condition in spring. But it will be fainter than 18 mag in June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  17 22.52   -7  7.5   3.032   2.784    66   17.1   4:01 (255, 32)  
Feb. 22  17 31.63   -6 33.8   2.993   2.826    70   17.1   4:10 (250, 37)  

* 112P/Urata-Niijima

Now it is 16.8 mag (Jan. 21, Toshihiko Ikemura, Hirohisa Sato). It brightens up to 17 mag until March. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15   1  5.14   16 24.5   1.741   1.449    56   17.2  20:26 (112,  2)  
Feb. 22   1 23.67   19 39.4   1.780   1.455    54   17.2  20:16 (115,  1)  

* C/2015 O1 ( PanSTARRS )

Fading. Now it is 17.6 mag (Feb. 1, Catalina Sky Survey). It stays observable in good condition for a while. But it will be fainter than 18 mag in April.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15   8  5.02   23 44.2   6.166   7.058   152   17.3  22:25 (180, 31)  
Feb. 22   7 59.58   23 36.7   6.273   7.102   144   17.4  21:52 (180, 31)  

* 289P/Blanpain

It approached to Earth down to 0.09 a.u. in early January, and it brightened up to 16.7 mag (Jan. 21, Toshihiko Ikemura, Hirohisa Sato). Now it is fading. Now it is 17.5 mag (Jan. 31, Ken-ichi Kadota). It is obesrvable in excellent condition in the Northern Hemisphere. It became observable also in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15   9 26.16   42 19.4   0.281   1.239   150   17.3  23:47 (180, 13)  
Feb. 22   9 33.28   38 17.0   0.343   1.299   150   17.8  23:27 (180, 17)  

* C/2019 T3 ( ATLAS )

Now it is 17.4 mag (Dec. 28, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 16.5 mag for a long time from 2020 to 2021. In the Northern Hemisphere, it is observable in excellent condition for a long time. In the Southern Hemisphere, it is not observable until 2021 summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15   0 57.58   71 46.4   6.438   6.518    90   17.5  20:26 (160,-29)  
Feb. 22   1  0.33   70 47.7   6.495   6.498    85   17.5  20:16 (158,-30)  

* 87P/Bus

Now it is 19.0 mag (Jan. 28, Mt. Lemmon Survey). It will brighten up to 17 mag and will be observable in excellent condition from March to May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  12 57.77   -6 39.0   1.423   2.189   129   17.7   3:21 (180, 62)  
Feb. 22  12 59.79   -6 41.2   1.351   2.175   136   17.5   2:56 (180, 62)  

* (944) Hidalgo

Now it is 17.2 mag (Nov. 25, ATLAS-MLO). It brightened up to 14 mag from autumn to winter in 2018. Now it is fading. It is observable at 17.5 mag in good condition from winter to spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  13 45.97   -3  9.9   3.850   4.421   119   17.6   4:01 (184, 58)  
Feb. 22  13 43.34   -3 15.4   3.794   4.461   127   17.6   3:39 (180, 58)  

* 117P/Helin-Roman-Alu 1

Now it is 18.0 mag (Jan. 29, ATLAS-MLO, Mauna Loa). It will brighten up to 13 mag in 2022. In 2020, it is observable at 17.5 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)  
Feb. 15  10 39.86   20 22.1   3.599   4.564   166   17.6   1:04 (180, 35)  
Feb. 22  10 35.52   20 49.0   3.577   4.552   168   17.6   0:32 (180, 34)  

* 173P/Mueller 5

Now it is 17.7 mag (Jan. 24, ATLAS-MLO, Mauna Loa). It is observable at 17-18 mag for a long time from late 2019 to early 2021. It will fade out before it passes the perihelion.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15   2 58.26    4 44.6   5.105   5.000    78   17.7  20:26 (123, 31)  
Feb. 22   3  1.33    5 21.0   5.198   4.986    72   17.7  20:16 (120, 28)  

* 175P/Hergenrother

It is observable at 17.5 mag in good condition until spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  17 11.37  -17 42.1   2.414   2.226    67   17.7   4:01 (264, 40)  
Feb. 22  17 23.01  -17 48.9   2.361   2.252    71   17.8   4:10 (260, 45)  

* C/2017 Y2 ( PanSTARRS )

It will be observable at 16.5-17 mag from spring in 2020 to summer in 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  19 56.91   19 38.1   5.758   5.082    43   17.8   4:01 (256,-15)  
Feb. 22  19 58.92   19 44.1   5.700   5.060    45   17.7   4:10 (252, -8)  

* C/2014 B1 ( Schwartz )

Now it is 17.5 mag (Feb. 3, ATLAS-HKO, Haleakala). It will be fainter than 18 mag in late April.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  12 44.56    8 32.2   9.989  10.735   137   17.8   3:08 (180, 47)  
Feb. 22  12 43.79    8 51.1   9.935  10.752   144   17.8   2:40 (180, 46)  

* 257P/Catalina

It will brighten up to 15.5 mag and will be observable in good condition from June to September.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Feb. 15  18 14.32  -10 26.7   3.109   2.636    52   18.0   4:01 (267, 23)  
Feb. 22  18 26.17   -9 42.8   3.012   2.608    56   17.9   4:10 (262, 28)  

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