title: Palomar Planet-Crossing Asteroid Survey
text: # Palomar Planet-Crossing Asteroid Survey
  
  Minor planets discovered: 20 :
  
  * see § List of discovered minor planets
  
  The Palomar Planet-Crossing Asteroid Survey (PCAS) was an astronomical survey, initiated by American astronomers Eleanor Helin and Eugene Shoemaker at the U.S Palomar Observatory, California, in 1973. The program is responsible for the discovery of 95 near-Earth Objects including 17 comets, while the Minor Planet Center directly credits PCAS with the discovery of 20 numbered minor planets during 1993–1994. PCAS ran for nearly 25 years until June 1995. It had an international extension, INAS, and was the immediate predecessor of the outstandingly successful NEAT program.
  
  ## Notable discoveries
  
  The first NEO discovered by PACS was (5496) 1973 NA, an Apollo asteroid with an exceptional orbital inclination of 68°, the most highly inclined minor planet known until 1999. In 1976, Eleanor Helin discovered 2062 Aten, the first of a new class of asteroids called the Aten asteroids with small orbits that are never far from Earth's orbit. As a result, these objects have a particularly high probability of colliding with the Earth. In 1979, Helin discovered an Apollo-type asteroid, that they later identified with the comet 4015 Wilson–Harrington. It was the first confirmation that a comet can evolve into an asteroid after it has degassed.
  
  ## List of discovered minor planets
  
  | (7029) 1993 XT2 | 14 December 1993 | list |
  | - | - | - |
  | (9072) 1993 RX3 | 12 September 1993 | list |
  | (9078) 1994 PB2 | 9 August 1994 | list |
  | (10363) 1994 $UP_{11}$ | 31 October 1994 | list |
  | (10564) 1993 $XQ_2$ | 14 December 1993 | list |
  | (13594) 1994 $PC_2$ | 9 August 1994 | list |
  | (14476) 1993 $XW_2$ | 14 December 1993 | list |
  | (14912) 1993 $RP_3$ | 12 September 1993 | list |
  | (15344) 1994 $PA_2$ | 9 August 1994 | list |
  | (18435) 1994 $GW_{10}$ | 14 April 1994 | list |
  | (18436) 1994 $GY_{10}$ | 14 April 1994 | list |
  | (24781) 1993 $RU_3$ | 12 September 1993 | list |
  | (24797) 1994 $PD_2$ | 9 August 1994 | list |
  | (24798) 1994 $PF_2$ | 9 August 1994 | list |
  | (26868) 1993 $RS_3$ | 12 September 1993 | list |
  | (37671) 1994 $UY_{11}$ | 31 October 1994 | list |
  | (39620) 1994 $PE_2$ | 9 August 1994 | list |
  | (46623) 1994 $GV_{10}$ | 14 April 1994 | list |
  | (52418) 1994 $GX_{10}$ | 14 April 1994 | list |
  | (120503) 1993 $RW_3$ | 12 September 1993 | list |
  