Weekly Information about Bright Comets (2010 Apr. 3: South)

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Updated on April 4, 2010
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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/2009 K5 ( McNaught )

Now it is so bright as 8.5 mag (Mar. 27, Juan Jose Gonzalez). It will be observable at 8-9 mag in good condition from April to May. After that, it keeps observable for a long time until when it fades out in the Northern Hemisphere, although it will be low in July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  19 40.51   27 20.1   1.353   1.475    75    8.5   4:50 (210, 21)  
Apr. 10  19 52.99   37 24.3   1.290   1.451    77    8.3   4:55 (201, 14)  

* 81P/Wild 2

Now it is so bright as 9.2 mag (Mar. 20, Marco Goiato). It will be fading gradually after late May. But it keeps observable in a good condition for a long time. It keeps observable until autumn when it fades down to 16 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  14 14.59   -5 53.6   0.674   1.645   158    9.6   1:31 (180, 61)  
Apr. 10  14 13.29   -5 28.7   0.675   1.663   164    9.7   1:02 (180, 61)  

* C/2006 W3 ( Christensen )

It reached up to 7.7 mag in last summer (Aug. 13, Chris Wyatt). It is fading now. It has already faded down to 11.5 mag (Mar. 20, Marco Goiato). In the Southern Hemisphere, it keeps observable for a long time after this. But in the Northern Hemisphere, it is only observable in the low sky in spring, then it will never be observable again.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  20 20.61  -27 39.2   4.236   4.044    72   11.3   4:50 (270, 54)  
Apr. 10  20 20.56  -28 44.8   4.150   4.085    79   11.3   4:55 (267, 61)  

* C/2010 F4 ( Machholz )

Bright new comet discovered in the extremely low sky at dawn. Now it is 10.7 mag (Mar. 27, Juan Jose Gonzalez). It will be too low to observe in early April. Then it will never be observable again.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3   0 30.96   31 45.9   1.311   0.618    26   11.5   4:50 (249,-28)  
Apr. 10   1 23.21   29  2.1   1.433   0.620    21   11.7  19:06 (108,-26)  

* C/2007 Q3 ( Siding Spring )

It brightened up to 9.5 mag on Jan. 13 (Juan Jose Gonzalez). Now it is still bright as 11.4 mag (Mar. 15, Juan Jose Gonzalez). However, it is fading more rapidly than expected. It will be observable in good condition for a long time after this in the Northern Hemisphere. It keeps visible visually until autumn. In mid March, the nuclear fragmentation was observed.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  15 21.35   60 39.8   2.539   2.999   107   11.6   2:37 (180, -6)  
Apr. 10  15 17.78   61 58.5   2.613   3.049   106   11.8   2:06 (180, -7)  

* C/2009 O2 ( Catalina )

Hidetaka Sato reported that there was no condensation and it was very diffuse on Mar. 12. This comet seems to disintegrate. However, it was reported so bright as 9.8 mag visually (Mar. 15, Juan Jose Gonzalez). In the Northern Hemisphere, it will be too low in early May. In the Southern Hemisphere, it keeps observable for a long time after this, but it keeps locating low.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3   3  5.51   37  4.7   0.870   0.723    44   12.4  19:16 (129, -9)  
Apr. 10   4  6.33   28  0.6   0.998   0.773    45   12.6  19:06 (128,  4)  

* C/2009 R1 ( McNaught )

It will approach to the sun down to 0.4 A.U. in July, and it is expected to reach up to 4 mag. It has been unobservable for a while, but now it is appearing in the morning sky. In the Northern Hemisphere, it is observable only until June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  22 41.76   -3 57.7   2.661   1.899    32   12.9   4:50 (266, 13)  
Apr. 10  22 52.09   -1 30.3   2.492   1.788    36   12.5   4:55 (260, 16)  

* 43P/Wolf-Harrington

It brightened up to 15.5 mag in January (Jan. 31, C. Rinner, F. Kugel). It is not observable now. The condition of this apparition is bad. It will reach up to 11-12 mag from spring to autumn in 2010, but it is not observable.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3   0 55.92   14 11.8   2.657   1.678     9   13.4  19:16 ( 93,-21)  
Apr. 10   1 15.24   15 34.3   2.624   1.637     7   13.2  19:06 ( 94,-22)  

* 10P/Tempel 2

Now it is 16.8 mag (Mar. 26, Yasukazu Ikari). It will be getting brighter rapidly in the morning sky. It keeps observable bright as 9-10 mag for a long time from spring to autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  19 25.46  -12 45.1   1.534   1.710    82   13.7   4:50 (235, 56)  
Apr. 10  19 44.40  -12 18.1   1.447   1.674    84   13.2   4:55 (230, 58)  

* 65P/Gunn

Now it is visible visually at 13.4 mag (Mar. 25, Chris Wyatt). It will brighten up to 12-13 mag in summer. But it locates somewhat low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  20  1.83  -25  2.5   2.497   2.448    75   13.5   4:50 (263, 57)  
Apr. 10  20 12.96  -24 59.9   2.419   2.452    80   13.4   4:55 (258, 61)  

* 29P/Schwassmann-Wachmann 1

Great outburst up to 11 mag occured on Feb. 2. Now it is still bright as 11.7 mag (Mar. 15, Juan Jose Gonzalez).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3   9 17.06   13 24.0   5.581   6.203   124   13.7  20:30 (180, 42)  
Apr. 10   9 16.33   13 25.0   5.678   6.204   117   13.7  20:02 (180, 42)  

* 126P/IRAS

It was observed as 15.6 mag at the end of last year (Dec. 6, A. Maury, J. B. de Vanssay, F. Mallia, F. Kugel). It will be 14 mag from winter to spring in 2010. But the condition is bad. Now it is not observable. In the Northern Hemisphere, it will appear in the morning sky at 15 mag in late May, then it keeps observable while fading gradually after that.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3   0 29.74   12 30.3   2.748   1.766     8   14.4   4:50 (267,-18)  
Apr. 10   0 42.96   15 45.1   2.760   1.786    10   14.5   4:55 (262,-16)  

* 118P/Shoemaker-Levy 4

It brightened up to 11.5 mag in January (Jan. 12, Juan Jose Gonzalez). It is still bright as 13.1 mag (Mar. 13, Carlos Labordena). It will be getting fainter and lower rapidly after this. It will be unobservable in June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3   6 52.87   19 24.0   1.866   2.109    89   14.8  19:16 (161, 33)  
Apr. 10   7  5.24   19 37.9   1.957   2.128    85   15.1  19:06 (159, 33)  

* P/2010 A5 ( LINEAR )

Now it is visible visually at 14.5 mag (Mar. 15, Juan Jose Gonzalez). It will be bright as 14-15 mag in spring. It keeps observable for a long time until September when it becomes fainter than 18 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  15 47.81  -30  9.0   0.892   1.721   130   15.1   3:04 (180, 85)  
Apr. 10  15 55.89  -30 36.7   0.848   1.715   135   15.0   2:44 (180, 86)  

* 116P/Wild 4

It brightened up to 11 mag in spring and summer in 2009. Appearing in the morninig sky again. It keeps observable after this until autumn when it becomes fainter than 18 mag while fading gradually. But it locates somewhat low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  19 43.48  -24 47.5   2.773   2.773    79   15.2   4:50 (259, 60)  
Apr. 10  19 50.76  -24 38.5   2.705   2.799    84   15.2   4:55 (252, 65)  

* 104P/Kowal 2

The condition of this apparition is very bad. It will go away without any observations.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3   1 55.77   12 53.3   2.152   1.245    18   15.4  19:16 (100, -8)  
Apr. 10   2 21.22   14 24.5   2.134   1.220    17   15.3  19:06 (102, -8)  

* 94P/Russell 4

Now it is 15.6 mag (Mar. 17, Toshiyuki Takahashi). It was expected to be observable at 15 mag in good condition from winter to spring. But actually, it had been much fainter than expected until January. However, it is brightening very rapidly in February.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  10  7.44   21 49.4   1.441   2.240   132   15.3  21:21 (180, 33)  
Apr. 10  10  8.36   21 18.0   1.500   2.242   126   15.4  20:54 (180, 34)  

* C/2009 U3 ( Hill )

Now it is 14.9 mag (Feb. 20, Ken-ichi Kadota). It has a very faint large coma. It was observed so bright as 13.5 mag in January (Jan. 16, Michael Jager).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3   3  0.80   71 48.0   1.422   1.428    69   15.3  19:16 (160,-29)  
Apr. 10   4  2.33   74 45.7   1.415   1.446    71   15.4  19:06 (165,-27)  

* 30P/Reinmuth 1

It became visible visually at 13.3 mag in winter (Feb. 3, Marco Goiato). Now it is fading slowly. It will be getting lower in the evening sky after this. It will be too low to observe in July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3   6 16.30   24 12.7   1.773   1.890    80   15.3  19:16 (153, 26)  
Apr. 10   6 31.65   24 30.5   1.833   1.886    77   15.4  19:06 (153, 25)  

* 74P/Smirnova-Chernykh

Now it is 15.3 mag (Mar. 26, P. Concari, S. Foglia, G. Galli, M. Tombelli). It was observed as 15-16 mag in early 2009. In 2010, it will be observable at 16 mag in good condition from winter to spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  13 47.95   -3 13.0   2.683   3.658   164   15.4   1:05 (180, 58)  
Apr. 10  13 43.68   -2 51.7   2.671   3.663   171   15.4   0:33 (180, 58)  

* C/2008 FK75 ( Lemmon-Siding Spring )

Now it is 15.5 mag (Feb. 20, S. Plaksa, E. Bryssinck). It keeps observable at 15 mag for a long time in 2010.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  18  0.61   25 55.8   4.489   4.738    98   15.5   4:50 (187, 29)  
Apr. 10  18  2.61   27 37.3   4.413   4.721   101   15.5   4:51 (180, 27)  

* C/2006 S3 ( LONEOS )

Brightening more slowly than expected. It will be observable at 13-14 mag for a long time from 2011 to 2012. It is getting higher gradually after this. In 2010, it is observable at 15-16 mag in good condition from spring to autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  21 58.91    0 34.6   8.189   7.481    42   16.1   4:50 (255, 19)  
Apr. 10  21 59.74    0 49.0   8.069   7.446    48   16.1   4:55 (250, 25)  

* 157P/Tritton

Now it is 15.1 mag (Mar. 10, Hidetaka Sato). It brightened up to 11 mag in outburst in 2003. However, it did not become so bright in this apparition. It will be getting lower and fainter rapidly after this. It will be fainter than 18 mag in May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3   5 18.01   23  4.4   1.489   1.439    67   16.3  19:16 (140, 20)  
Apr. 10   5 43.78   22 47.6   1.545   1.466    66   16.4  19:06 (142, 22)  

* C/2005 L3 ( McNaught )

It brightened up to 13 mag and observed visually from 2007 to 2009. Due to the far distance, it is bright as 14.9 mag still now (Jan. 15, Ken-ichi Kadota). It will be observable in good condition again until spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  12 25.58   42 43.8   7.259   7.961   131   16.3  23:38 (180, 12)  
Apr. 10  12 18.82   42 55.3   7.341   7.994   127   16.4  23:03 (180, 12)  

* C/2008 N1 ( Holmes )

Now it is 16.6 mag (Feb. 18, Ken-ichi Kadota). It keeps observable in good condition for a while, but it will be fading after this. It will be fainter than 18 mag in July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  13 40.28   29 20.2   2.522   3.377   143   16.4   0:58 (180, 26)  
Apr. 10  13 21.74   29  8.1   2.562   3.416   143   16.5   0:12 (180, 26)  

* 203P/2008 R4 ( Korlevic )

Now it is 16.3 mag (Jan. 23, Ken-ichi Kadota). This comet tends to brighten after the perihelion passage. It will be observable at 16 mag in 2010 and 2011.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3   5 12.66   23 41.7   3.465   3.195    66   16.5  19:16 (139, 19)  
Apr. 10   5 21.66   23 46.1   3.556   3.199    61   16.5  19:06 (138, 18)  

* C/2006 OF2 ( Broughton )

It brightned up to 10 mag from late 2008 to early 2009. Now it is fading. It has already faded down to 16.9 mag (Mar. 13, Ken-ichi Kadota). It will be fainter than 18 mag in June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3   9 40.06    4  0.3   5.300   6.018   132   17.0  20:53 (180, 51)  
Apr. 10   9 38.63    4  3.6   5.440   6.072   125   17.1  20:24 (180, 51)  

* C/2008 Q3 ( Garradd )

It brightened up to 6.7 mag in 2009 June (June 9, Marco Goiato). Now it is fading. It has already faded down to 17.5 mag (Mar. 31, Hidetaka Sato). It will be fainter than 18 mag in May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  10 34.17   57 38.2   3.288   3.773   111   17.1  21:46 (180, -3)  
Apr. 10  10 18.40   57 20.4   3.441   3.837   105   17.4  21:03 (180, -2)  

* C/2010 B1 ( Cardinal )

Now it is 17.3 mag (Mar. 30, Yasukazu Ikari). It keeps observable at 17 mag until spring. It will reach up to 14 mag and will be observable in good condition in the next winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3   5 55.40   56 41.7   4.282   4.200    78   17.2  19:16 (163, -5)  
Apr. 10   5 57.06   54 55.7   4.340   4.154    72   17.2  19:06 (160, -5)  

* C/2009 F2 ( McNaught )

It was observed at 17.5 mag in 2009 spring. It will be observable at 17.5 mag again in 2010 spring. However, it locates low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  13 44.01  -21 52.7   5.016   5.957   158   17.3   1:01 (180, 77)  
Apr. 10  13 41.27  -20 58.1   4.991   5.965   165   17.2   0:30 (180, 76)  

* C/2006 Q1 ( McNaught )

Now it is 17.4 mag (Feb. 17, Hidetaka Sato). It will be fainter than 18 mag in July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  18 58.91   35 52.5   6.521   6.506    84   17.3   4:50 (198, 16)  
Apr. 10  19  0.27   36 49.5   6.515   6.556    87   17.4   4:55 (191, 17)  

* 213P/2009 B3 ( Van Ness )

It brightened up to 13 mag in major outburst in 2005. It was recovered at 20.7 mag in 2009 January. However, no observations have been reported after 2009 April. The current brightness is quite uncertain.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  13 21.29  -23  7.0   2.467   3.425   160   17.5   0:38 (180, 78)  
Apr. 10  13 15.61  -22 49.4   2.423   3.400   164   17.4   0:05 (180, 78)  

* C/2007 VO53 ( Spacewatch )

Now it is 17.3 mag (Jan. 23, Ken-ichi Kadota). It keeps observable at 17.5 mag in good condition for a long time in 2010.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  23 12.09   72 18.3   5.117   4.846    68   17.4   4:50 (201,-32)  
Apr. 10  23 15.79   73 15.6   5.134   4.844    67   17.4   4:55 (199,-30)  

* 217P/2009 F3 ( LINEAR )

It reached up to 8.5 mag on Oct. 15 (Toru Yusa). Now it is fading. It has already faded down to 17.6 mag (Mar. 11, Yasukazu Ikari). It will be fainter than 18 mag soon.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3   6 30.33   21 49.6   2.498   2.593    84   17.4  19:16 (156, 29)  
Apr. 10   6 39.62   22  4.0   2.644   2.648    79   17.7  19:06 (154, 28)  

* 235P/2010 F2 ( LINEAR )

Now it is observable at 17.5 mag in good condition. However, it will be fainter than 18 mag in May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  11 33.39   -2 59.7   1.783   2.749   161   17.6  22:46 (180, 58)  
Apr. 10  11 30.57   -2 10.6   1.816   2.751   153   17.7  22:16 (180, 57)  

* C/2009 Y1 ( Catalina )

Now it is 17.4 mag (Mar. 6, C. Rinner, F. Kugel). It will reach up to 15 mag and will be observable in good condition from autum to winter in 2010. In the Northern Hemisphere, it keeps observable for a long time while it is brightening gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3  10  0.60   72  6.8   3.721   3.988    98   17.9  21:13 (180,-17)  
Apr. 10   9 41.89   72 15.0   3.754   3.937    93   17.8  20:27 (180,-17)  

* P/2004 F3 ( NEAT )

New periodic comet which brightened up to 14 mag in 2004 and 2005. It should be observable at 18 mag also around the aphelion. However, no observations have been reported since 2008 January. It seems to have faded out rapidly. Now it is fainter than 20.4 mag actually (Sept. 16, Leonid Elenin).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  3   6 23.16   30 56.9   4.902   4.866    82   20.3  19:16 (158, 20)  
Apr. 10   6 26.60   30 52.9   5.000   4.856    76   20.4  19:06 (154, 19)  

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