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Post Info TOPIC: Comet 107P (4015) Wilson-Harrington

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Posts: 131433
Date:
 Comet 107P/Wilson-Harrington Permalink Comet 107P/Wilson-Harrington is at Opposition (2.438 AU) on the 19th February 2015.  __________________

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Posts: 131433
Date:
 RE: Comet 107P (4015) Wilson-Harrington Permalink Comet 4015 Wilson-Harrington (1979 VA) makes its closest approach to the Earth (2.409 AU) on the 6th February 2015 EphemerisDate 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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Posts: 131433
Date:
 Permalink Comet 107P/Wilson-Harrington makes its closest approach to the Earth (1.817 AU) on the 14th February 2014 __________________

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Posts: 131433
Date:
 Permalink Comet 107P/Wilson-Harrington is at Perihelion (0.994 AU) on the 5th February 2014 __________________

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Posts: 131433
Date:
 Comet 107P/Wilson-Harrington Permalink EphemerisDate 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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Posts: 131433
Date:
 RE: Comet 107P (4015) Wilson-Harrington Permalink Comet 107P/Wilson-Harrington makes its closest approach to the Earth (1.801 AU) on the 30th May, 2013. __________________

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Posts: 131433
Date:
 Permalink Comet 107P/Wilson-Harrington is at Opposition (1.865 AU) on the 8th May, 2013.EphemerisDate 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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Posts: 131433
Date:
 Permalink 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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Posts: 131433
Date:
 Comet 107P/Wilson-Harrington Permalink Title: Photometric Observations of 107P/Wilson-HarringtonAuthors: 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 YoshikawaWe 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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Posts: 131433
Date:
 RE: Comet 107P (4015) Wilson-Harrington Permalink Title: "Atlas of Secular Light Curves of Comets"Authors: Ignacio FerrinIn 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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