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Post Info TOPIC: Comet 238P/Read


L

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RE: Comet 238P/Read
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Comet 238P/Read is at Opposition (2.306 AU) in the constellation Ophiuchus on the 13th June 2015.

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase   Mag
2015 06 10    17 24 15.9 -24 04 31   2.3146  3.3285   176.6     1.0  21.5
2015 06 11    17 23 23.9 -24 04 04   2.3115  3.3263   177.7     0.7  21.5
2015 06 12    17 22 31.7 -24 03 35   2.3088  3.3240   178.7     0.4  21.5
2015 06 13    17 21 39.3 -24 03 05   2.3063  3.3217   179.1     0.3  21.5
2015 06 14    17 20 46.9 -24 02 33   2.3041  3.3194   178.3     0.5  21.5
2015 06 15    17 19 54.4 -24 01 59   2.3022  3.3171   177.3     0.8  21.5
2015 06 16    17 19 01.9 -24 01 24   2.3006  3.3149   176.2     1.2  21.5
2015 06 17    17 18 09.5 -24 00 47   2.2993  3.3126   175.1     1.5  21.5
2015 06 18    17 17 17.1 -24 00 09   2.2982  3.3103   173.9     1.9  21.5
2015 06 19    17 16 25.0 -23 59 30   2.2975  3.3080   172.8     2.2  21.5
2015 06 20    17 15 33.0 -23 58 50   2.2970  3.3057   171.6     2.6  21.5
2015 06 21    17 14 41.4 -23 58 08   2.2969  3.3034   170.5     2.9  21.5
2015 06 22    17 13 50.0 -23 57 25   2.2970  3.3011   169.3     3.3  21.5
2015 06 23    17 12 59.0 -23 56 41   2.2974  3.2988   168.2     3.6  21.5
2015 06 24    17 12 08.5 -23 55 56   2.2980  3.2965   167.1     4.0  21.5
2015 06 25    17 11 18.4 -23 55 10   2.2990  3.2941   165.9     4.3  21.5
2015 06 26    17 10 28.8 -23 54 23   2.3002  3.2918   164.8     4.7  21.5
2015 06 27    17 09 39.7 -23 53 35   2.3017  3.2895   163.6     5.0  21.5
2015 06 28    17 08 51.3 -23 52 47   2.3035  3.2872   162.5     5.3  21.5
2015 06 29    17 08 03.5 -23 51 58   2.3055  3.2849   161.4     5.7  21.5
2015 06 30    17 07 16.3 -23 51 09   2.3078  3.2825   160.2     6.0  21.5


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L

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Comet 238P/Read is at Opposition (2.930 AU) on the 19th April 2014

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag
2014 04 18    13 48 06.5 -10 25 56   2.9310  3.9348   178.7     0.3  22.8
2014 04 19    13 47 23.4 -10 22 06   2.9301  3.9343   179.3     0.2  22.8
2014 04 20    13 46 40.3 -10 18 16   2.9294  3.9337   178.6     0.3  22.8
2014 04 21    13 45 57.3 -10 14 25   2.9291  3.9332   177.5     0.6  22.8
2014 04 22    13 45 14.3 -10 10 35   2.9291  3.9327   176.4     0.9  22.8
2014 04 23    13 44 31.4 -10 06 45   2.9294  3.9321   175.3     1.2  22.8
2014 04 24    13 43 48.6 -10 02 56   2.9299  3.9316   174.1     1.5  22.8
2014 04 25    13 43 05.9 -09 59 07   2.9308  3.9311   173.0     1.8  22.8
2014 04 26    13 42 23.5 -09 55 19   2.9320  3.9305   171.8     2.1  22.8
2014 04 27    13 41 41.2 -09 51 32   2.9335  3.9300   170.7     2.4  22.8
2014 04 28    13 40 59.3 -09 47 47   2.9353  3.9294   169.5     2.7  22.8
2014 04 29    13 40 17.6 -09 44 03   2.9374  3.9288   168.3     3.0  22.8
2014 04 30    13 39 36.3 -09 40 21   2.9397  3.9283   167.2     3.3  22.8


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Title: Main-Belt Comet 238P/Read Revisited
Authors: Henry H. Hsieh, Karen J. Meech, Jana Pittichova

We present a series of observations of the return of activity in main-belt comet 238P/Read. Using data obtained in July and August 2010 when 238P appeared to be largely inactive, we find best-fit IAU phase function parameters of H=19.05±0.05 mag, corresponding to a nucleus radius of r_n ~ 0.4 km (assuming an albedo of p_R=0.05), and G=-0.03±0.05. Observations from September 2010 onward show a clear rise in activity, causing both a notable change in visible morphology and increasing photometric excesses beyond what would be expected based on bare nucleus observations. By the end of the observing period reported on here, the dust mass in the coma shows indications of reaching a level comparable to that observed in 2005, but further observations are highly encouraged once 238P again becomes observable from Earth in mid-2011 to confirm whether this level of activity is achieved, or if a notable decrease in activity strength compared to 2005 can be detected. Comet 238P is now the second main-belt comet (after 133P/Elst-Pizarro) observed to exhibit recurrent activity, providing strong corroboration for the conclusion that it is a true comet whose active episodes are driven by sublimation of volatile ice.

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Comet 238P/Read is at Perihelion (2.360 AU) on the 10th March, 2011.

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