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105P/Singer Brewster

105P/Singer Brewster
Discovered by Stephen Singer-Brewster
Discovery date May 3, 1986
1986 XI; 1992 XXVI
Orbital characteristics A
Epoch 2011-Feb-08
(JD 2455600.5)
Aphelion 4.8915 AU
Perihelion 2.0502 AU
Semi-major axis 3.4709 AU
Eccentricity 0.40929
Orbital period 6.47 yr
Inclination 9.1706°
Last perihelion February 26, 2012[1][2]
September 11, 2005
April 6, 1999
Next perihelion 2018-Aug-10[3]

105P/Singer Brewster is a periodic comet in the Solar System. It was discovered in 1986, and received the name of 1986d under the old naming system.[4]

Because 105P/Singer Brewster only comes within 2 AU of the Sun,[5] during the 2012 perihelion passage it is only expected to brighten to about apparent magnitude 17.[6]

The comet nucleus is estimated to be 2.2 kilometers in diameter.[5]

The orbit of Comet Singer Brewster was altered significantly in August 1976 when it passed within 0.376 AU of Jupiter and will be altered again in August 2059.[7][8]

The single discoverer bears a hyphenated surname (Singer-Brewster), but co-discovered comets bear the names of the co-discoverers linked by hyphens, e.g. Shoemaker-Levy 9, Swift-Tuttle, etc. In these cases, the IAU either removes one of the parts of the name or replaces the hyphen by a space.[9][10]


  1. ^ Seiichi Yoshida (2011-02-19). "105P/Singer Brewster". Seiichi Yoshida's Comet Catalog. Archived from the original on April 27, 2011. Retrieved 2011-05-03. 
  2. ^ Syuichi Nakano (2009-04-21). "105P/Singer Brewster (NK 1762)". OAA Computing and Minor Planet Sections. Retrieved 2011-05-03. 
  3. ^ Patrick Rocher (March 7, 2011). "Note number : 0104 P/Singer-Brewster : 105P". Institut de mécanique céleste et de calcul des éphémérides. Retrieved 2012-02-27. 
  4. ^ Excerpts from the IAU circulars, May 3, 1986, in Stardust June 1986, issue 10, volume XLII, published by National Capital Astronomers
  5. ^ a b "JPL Small-Body Database Browser: 105P/Singer Brewster". 2011-02-05. Retrieved 2011-05-03. 
  6. ^ "Magnitude plot for 105P/Singer Brewster in 2012". Comet for Windows. Retrieved 2011-05-03. 
  7. ^ "C&MS: 105P/Singer Brewster". Retrieved 2012-01-13. 
  8. ^ "JPL Close-Approach Data: 105P/Singer Brewster". 2011-02-05. Retrieved 2012-02-17. 
  9. ^ IAU Comet-naming Guidelines, International Astronomical Union 
  10. ^ Don E. Machholz (1989), "Comet corner", Journal of the Association of Lunar and Planetary Observers. The Strolling astronomer (Association of Lunar and Planetary Observers (U.S.)) 33 (1): 25–28, 26, A hyphen (-) is used in a comet's name only to separate the discoverers. Thus, when sometimes the discover has a double name, the hyphen is dropped from the comet's name in order to show that there was only one discoverer. For example, in 1986 Stephen Singer-Brewster discovered a comet. It is known as "Comet Singer Brewster."  Go to the journal search in the Astrophysics Data System, pick "Journal of the Association of Lunar and Planetary Observers", volume "33", page "26". It's not in the list of abstracts, you have to check the page thumbnails.

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Periodic comets (by number)
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