(5253) 1985 XB
Encyclopedia
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.
Minor planet
An asteroid group or minor-planet group is a population of minor planets that have a share broadly similar orbits. Members are generally unrelated to each other, unlike in an asteroid family, which often results from the break-up of a single asteroid...
. It was discovered by Stephen Singer-Brewster
Stephen Singer-Brewster
Stephen C. Singer-Brewster is an American astronomer.Mr. Brewster is a member of the American Association of Variable Star Observers. He participated in the Palomar Planet Crossing Asteroid Survey as an observer and astrometrist under the direction of Dr. Eleanor F. Helin from 1985 to 1988....
at the Palomar Observatory
Palomar Observatory
Palomar Observatory is a privately owned observatory located in San Diego County, California, southeast of Pasadena's Mount Wilson Observatory, in the Palomar Mountain Range. At approximately elevation, it is owned and operated by the California Institute of Technology...
in San Diego County
San Diego County, California
San Diego County is a large county located in the southwestern corner of the US state of California. Hence, San Diego County is also located in the southwestern corner of the 48 contiguous United States. Its county seat and largest city is San Diego. Its population was about 2,813,835 in the 2000...
, California
California
California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...
, on December 15, 1985.