105P/Singer Brewster

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]

105P/Singer Brewster

Discovery
Discovered by	Stephen Singer-Brewster
Discovery date	May 3, 1986
Designations
Alternative designations	1986 XI; 1992 XXVI
Orbital characteristics
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	2018-Aug-10[1] February 26, 2012[2][3] September 11, 2005 April 6, 1999
Next perihelion	2025-Jan-22[1]

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]