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Post Info TOPIC: Comet 107P (4015) Wilson-Harrington
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Comet 107P/Wilson-Harrington
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Comet 107P/Wilson-Harrington is at Opposition (2.438 AU) on the 19th February 2015.

 


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RE: Comet 107P (4015) Wilson-Harrington
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Comet 4015 Wilson-Harrington (1979 VA) makes its closest approach to the Earth (2.409 AU) on the 6th February 2015 

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase   Mag
2015 02 05    10 16 32.8 +07 11 15   2.4095  3.3607   161.9     5.2
2015 02 06    10 15 35.4 +07 16 09   2.4094  3.3653   163.2     4.9
2015 02 07    10 14 37.5 +07 21 07   2.4097  3.3700   164.4     4.5
2015 02 08    10 13 39.3 +07 26 08   2.4102  3.3746   165.6     4.2
2015 02 09    10 12 40.7 +07 31 12   2.4111  3.3792   166.9     3.8
2015 02 10    10 11 41.8 +07 36 19   2.4123  3.3839   168.1     3.4
2015 02 11    10 10 42.7 +07 41 27   2.4138  3.3885   169.3     3.1
2015 02 12    10 09 43.4 +07 46 38   2.4156  3.3930   170.5     2.7
2015 02 13    10 08 43.9 +07 51 51   2.4178  3.3976   171.7     2.4
2015 02 14    10 07 44.3 +07 57 05   2.4202  3.4022   172.8     2.1
2015 02 15    10 06 44.7 +08 02 20   2.4230  3.4067   173.9     1.8
2015 02 16    10 05 45.1 +08 07 36   2.4262  3.4112   174.9     1.5
2015 02 17    10 04 45.6 +08 12 53   2.4296  3.4158   175.8     1.2
2015 02 18    10 03 46.1 +08 18 10   2.4334  3.4203   176.4     1.0
2015 02 19    10 02 46.9 +08 23 27   2.4375  3.4248   176.6     1.0
2015 02 20    10 01 47.8 +08 28 43   2.4420  3.4292   176.4     1.0
2015 02 21    10 00 49.0 +08 34 00   2.4467  3.4337   175.8     1.2
2015 02 22    09 59 50.5 +08 39 15   2.4518  3.4382   174.9     1.5
2015 02 23    09 58 52.4 +08 44 29   2.4573  3.4426   173.9     1.7
2015 02 24    09 57 54.8 +08 49 42   2.4630  3.4470   172.8     2.1
2015 02 25    09 56 57.5 +08 54 53   2.4691  3.4514   171.7     2.4
2015 02 26    09 56 00.8 +09 00 02   2.4755  3.4558   170.5     2.7
2015 02 27    09 55 04.7 +09 05 09   2.4822  3.4602   169.4     3.0
2015 02 28    09 54 09.1 +09 10 14   2.4892  3.4646   168.2     3.4


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Comet 107P/Wilson-Harrington makes its closest approach to the Earth (1.817 AU) on the 14th February 2014



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Comet 107P/Wilson-Harrington is at Perihelion (0.994 AU) on the 5th February 2014



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Posts: 131433
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Comet 107P/Wilson-Harrington
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Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag
2014 02 05    22 39 17.2 -06 52 13   1.8249  0.9941    22.9    22.7    
2014 02 06    22 43 32.6 -06 26 34   1.8234  0.9942    23.1    22.9    
2014 02 07    22 47 47.9 -06 00 45   1.8220  0.9944    23.2    23.0    
2014 02 08    22 52 03.2 -05 34 46   1.8209  0.9948    23.3    23.1    
2014 02 09    22 56 18.4 -05 08 38   1.8198  0.9954    23.4    23.2    
2014 02 10    23 00 33.6 -04 42 22   1.8190  0.9962    23.6    23.3     
2014 02 11    23 04 48.6 -04 15 59   1.8183  0.9971    23.7    23.5    
2014 02 12    23 09 03.6 -03 49 30   1.8178  0.9983    23.9    23.6     
2014 02 13    23 13 18.4 -03 22 55   1.8175  0.9996    24.0    23.7      
2014 02 14    23 17 33.0 -02 56 15   1.8174  1.0012    24.1    23.8      
2014 02 15    23 21 47.5 -02 29 31   1.8174  1.0029    24.3    23.9      
2014 02 16    23 26 01.9 -02 02 44   1.8177  1.0047    24.4    24.0     
2014 02 17    23 30 16.0 -01 35 55   1.8181  1.0068    24.5    24.1      
2014 02 18    23 34 29.9 -01 09 04   1.8187  1.0090    24.7    24.1      
2014 02 19    23 38 43.6 -00 42 13   1.8195  1.0114    24.8    24.2      
2014 02 20    23 42 57.0 -00 15 22   1.8205  1.0140    25.0    24.3


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RE: Comet 107P (4015) Wilson-Harrington
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Comet 107P/Wilson-Harrington makes its closest approach to the Earth (1.801 AU) on the 30th May, 2013.



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Comet 107P/Wilson-Harrington is at Opposition (1.865 AU) on the 8th May, 2013.

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag
2013 05 07    14 56 15.3 -19 51 03   1.8716  2.8797   176.9     1.1
2013 05 08    14 55 04.9 -19 45 49   1.8653  2.8737   177.0     1.0
2013 05 09    14 53 54.1 -19 40 30   1.8592  2.8677   176.7     1.2
2013 05 10    14 52 43.0 -19 35 05   1.8535  2.8616   176.0     1.4
2013 05 11    14 51 31.7 -19 29 36   1.8481  2.8556   175.0     1.8
2013 05 12    14 50 20.3 -19 24 02   1.8430  2.8495   173.9     2.1
2013 05 13    14 49 08.8 -19 18 24   1.8381  2.8434   172.8     2.5
2013 05 14    14 47 57.3 -19 12 42   1.8336  2.8374   171.6     3.0
2013 05 15    14 46 45.8 -19 06 56   1.8294  2.8312   170.5     3.4
2013 05 16    14 45 34.6 -19 01 07   1.8255  2.8251   169.3     3.8
2013 05 17    14 44 23.5 -18 55 16   1.8219  2.8190   168.0     4.3
2013 05 18    14 43 12.7 -18 49 21   1.8186  2.8128   166.8     4.7
2013 05 19    14 42 02.2 -18 43 25   1.8155  2.8067   165.6     5.1
2013 05 20    14 40 52.2 -18 37 26   1.8128  2.8005   164.4     5.6
2013 05 21    14 39 42.6 -18 31 27   1.8103  2.7943   163.1     6.0
2013 05 22    14 38 33.6 -18 25 26   1.8082  2.7881   161.9     6.5
2013 05 23    14 37 25.2 -18 19 24   1.8063  2.7818   160.7     6.9
2013 05 24    14 36 17.5 -18 13 22   1.8047  2.7756   159.4     7.4
2013 05 25    14 35 10.5 -18 07 19   1.8033  2.7693   158.2     7.8
2013 05 26    14 34 04.3 -18 01 18   1.8023  2.7630   157.0     8.2
2013 05 27    14 32 58.9 -17 55 16   1.8015  2.7567   155.7     8.7
2013 05 28    14 31 54.4 -17 49 16   1.8009  2.7504   154.5     9.1
2013 05 29    14 30 50.9 -17 43 17   1.8007  2.7441   153.3     9.6
2013 05 30    14 29 48.4 -17 37 21   1.8006  2.7377   152.1    10.0
2013 05 31    14 28 46.9 -17 31 26   1.8009  2.7314   150.9    10.4


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Title: "The 2009 Apparition of Methuselah Comet 107P/Wilson-Harrington: A Case of Comet Rejuvenation?"
Authors: I. Ferrín, Hiromi Hamanowa, Hiroko Hamanowa, J. Hernández, E. Sira, A. Sánchez, H. Zhao, R. Miles

(1) We find that comet 107P/WH was active in 1949, 1979, 1992, 2005, and 2009.
(2) Its age can be measured. We find T-AGE=4700 comet years, WB-AGE=7800 cy.
(3) This is a methuselah comet very near to its dormancy phase, being temporarily rejuvenated due to a diminution of its perihelion distance.
(4) We measured the diameter as Deffe=3.67±0.06 km, and the rotational period, Prot=6.093±0.002 h.
(5) We define the region of the graveyard of comets, and three comets belong to the graveyard: 107P/Wilson-Harrington, 133P/Elst-Pizarro and D/1891W1 Blanpain.

Read more (1927kb, PDF)



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Comet 107P/Wilson-Harrington
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Title: Photometric Observations of 107P/Wilson-Harrington
Authors: Seitaro Urakawa, Shin-ichiro Okumura, Kota Nishiyama, Tsuyoshi Sakamoto, Noritsugu Takahashi, Shinsuke Abe, Masateru Ishiguro, Kohei Kitazato, Daisuke Kuroda, Sunao Hasegawa, Kouji Ohta, Nobuyuki Kawai, Yasuhiro Shimizu, Shogo Nagayama, Kenshi Yanagisawa, Michitoshi Yoshida, Makoto Yoshikawa

We present lightcurve observations and multiband photometry for 107P/Wilson-Harrington using five small- and medium-sized telescopes. The lightcurve has shown a periodicity of 0.2979 day (7.15 hour) and 0.0993 day (2.38 hour), which has a commensurability of 3:1. The physical properties of the lightcurve indicate two models: (1) 107P/Wilson-Harrington is a tumbling object with a sidereal rotation period of 0.2979 day and a precession period of 0.0993 day. The shape has a long axis mode (LAM) of L1:L2:L3 = 1.0:1.0:1.6. The direction of the total rotational angular momentum is around {\lambda} = 310°, {\beta} = -10°, or {\lambda} = 132°, {\beta} = -17°. The nutation angle is approximately constant at 65°. (2) 107P/Wilson-Harrington is not a tumbler. The sidereal rotation period is 0.2979 day. The shape is nearly spherical but slightly hexagonal with a short axis mode (SAM) of L1:L2:L3 = 1.5:1.5:1.0. The pole orientation is around {\lambda} = 330°, {\beta} = -27°. In addition, the model includes the possibility of binary hosting. For both models, the sense of rotation is retrograde. Furthermore, multiband photometry indicates that the taxonomy class of 107P/Wilson-Harrington is C-type. No clear rotational colour variations are confirmed on the surface.

Read more (253kb, PDF)



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RE: Comet 107P (4015) Wilson-Harrington
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Title: "Atlas of Secular Light Curves of Comets"
Authors: Ignacio Ferrin

In this work we have compiled 37,692 observations of 27 periodic and non-periodic comets to create the secular light curves (SLCs), using 2 plots per comet. The data has been reduced homogeneously. Our overriding goal is to learn the properties of the ensemble of comets. More than 30 parameters are listed, of which over ~20 are new and measured from the plots. We define two ages for a comet using activity as a proxy, the photometric age P-AGE, and the time-age, T-AGE. It is shown that these two parameters are robust, implying that the input data can have significant errors but P-AGE and T-AGE come out with small errors. This is due to their mathematical definition. It is shown that P-AGE classifies comets by shape of their light curve. The value of this Atlas is twofold: The SLCs not only show what we know, but also show what we do not know, thus pointing the way to meaningful observations. Besides their scientific value, these plots are useful for planning observations. The SLCs have not been modelled, and there is no cometary light curve standard model as there is for some variable stars (i.e. eclipsing binaries). Comets are classified by age and size. In this way it is found that 29P/Schwassmann-Wachmann 1 is a baby goliath comet, while C/1983 J1 Sugano-Saigusa-Fujikawa is a middle age dwarf. There are new classes of comets based on their photometric properties. The secular light curves presented in this Atlas exhibit complexity beyond current understanding.

Read more (7.43mb, PDF)

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