Stephen C. Singer-Brewster (a.k.a. Stephen C. Brewster) is an American astronomer

Astronomer

An astronomer is a scientist who studies celestial bodies such as planets, stars and galaxies.Historically, astronomy was more concerned with the classification and description of phenomena in the sky, while astrophysics attempted to explain these phenomena and the differences between them using...

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Mr. Brewster is a member of the American Association of Variable Star Observers

American Association of Variable Star Observers

Since its founding in 1911, the American Association of Variable Star Observers has coordinated, collected, evaluated, analyzed, published, and archived variable star observations made largely by amateur astronomers and makes the records available to professional astronomers, researchers, and...

. He participated in the Palomar Planet Crossing Asteroid Survey (PCAS) as an observer and astrometrist under the direction of Dr. Eleanor F. Helin (JPL/Caltech) from 1985 to 1988. During this period Mr. Brewster was credited with six new asteroid discoveries and one periodic comet discovery - comet

Comet

A comet is an icy small Solar System body that, when close enough to the Sun, displays a visible coma and sometimes also a tail. These phenomena are both due to the effects of solar radiation and the solar wind upon the nucleus of the comet...

 105P/Singer Brewster

105P/Singer Brewster

105P/Singer Brewster is a periodic comet in our solar system. Its name is unusual: co-discovered comets commonly bear the names of the co-discoverers linked by hyphens rather than dashes...

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He also discovered six asteroid

Asteroid

Asteroids are a class of small Solar System bodies in orbit around the Sun. They have also been called planetoids, especially the larger ones...

s:

Asteroid

Asteroid

Asteroids are a class of small Solar System bodies in orbit around the Sun. They have also been called planetoids, especially the larger ones...

s discovered: 6

(4555) 1987 QL (4555) 1987 QL 1987 QL is a main-belt minor planet. It was discovered by Stephen Singer-Brewster at the Palomar Observatory in San Diego County, California, on August 24, 1987.-External links:*...	August 24, 1987
(5253) 1985 XB (5253) 1985 XB 1985 XB is a Mars-crossing minor planet. It was discovered by Stephen Singer-Brewster at the Palomar Observatory in San Diego County, California, on December 15, 1985.-External links:*...	December 15, 1985
(15700) 1987 QD	August 24, 1987
(24655) 1987 QH	August 25, 1987
(26817) 1987 QB	August 25, 1987
(26818) 1987 QM	August 25, 1987

Mr. Brewster has been an active member of Stony Ridge Observatory

Stony Ridge Observatory

Stony Ridge Observatory is an astronomical observatory built by and for amateur astronomers in the mountains of Los Angeles County, California in 1963. When installed, its Newtonian-Cassegrain likely ranked as the largest amateur telescope in the United States. Asteroids 10168 Stony Ridge and...

, Inc. since 1983 and has served on its Board of Directors. He formed the Faint Object Follow Up (FOFU) project at Stony Ridge in 2000 to encourage observations of faint asteroids and comets.

Dr. Helin honored him with the naming of an asteroid, (10315) Brewster, to acknowledge his work for PCAS, Stony Ridge Observatory, and the Jet Propulsion Laboratory

Jet Propulsion Laboratory

Jet Propulsion Laboratory is a federally funded research and development center and NASA field center located in the San Gabriel Valley area of Los Angeles County, California, United States. The facility is headquartered in the city of Pasadena on the border of La Cañada Flintridge and Pasadena...

 (JPL). Mr. Brewster is currently a retired member of the staff at JPL. At JPL, Mr. Brewster worked on a number of spacecraft missions such as the Pluto Fast Flyby Mission

Pluto Fast Flyby

The Pluto Fast Flyby was a space mission meant to perform a flyby of the dwarf planet Pluto. This spacecraft was meant to be launched by 2000 and reach Pluto by 2010, so it could examine Pluto's atmosphere before it froze to the ground as 'snow' as Pluto moves away from the sun...

, the Outer Planets/Solar Probe Mission and the Europa Orbiter

Europa Orbiter

The Europa Orbiter was a planned NASA mission to Jupiter's Moon Europa, that was cancelled in 2002. Its main objectives included determining the presence or absence of a subsurface ocean and identifying candidate sites for future lander misions....

mission. At the time of his retirement in 2003 he was working in the Mars Advanced Studies Program and the Europa Orbiter/X2000 Avionics Development
project at JPL.