105P/Singer Brewster

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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, archived from the original on March 4, 2016 
  10. ^ Don E. Machholz (1989), "Comet Corner", Journal of the Association of Lunar and Planetary Observers, 33 (1): 25–28, 26, Bibcode:1989JALPO..33...25M, 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." 

External links[edit]

Numbered comets
105P/Singer Brewster Next