Discovered by E. F. Helin MPC designation (7335) 1989 JA Orbital period 862 days Orbits Sun | Discovery date 1 May 1989 Alternative names 1989 JA Observation arc 26.76 yr (9,773 days) Discovered 1 May 1989 Discoverer Eleanor F. Helin | |
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(7335) 1989 JA, provisional designation 1989 JA, is an stony asteroid of the Apollo group, classified as near-Earth object and potentially hazardous asteroid, approximately 1 kilometer in diameter. It was discovered on 1 May 1989, by American astronomer Eleanor Helin at the U.S. Palomar Observatory in California.
The S-type asteroid orbits the Sun at a distance of 0.9–2.6 AU once every 2 years and 4 months (861 days). Its orbit has an eccentricity of 0.48 and an inclination of 15° with respect to the ecliptic. The first observation was made at the discovering observatory in April 1989, extending the asteroid's observation arc by 1 month prior to its discovery observation. It has an minimum orbital intersection distance to Earth of 0.0220 AU (3,290,000 km) which corresponds to 8.4 lunar distances.
During its discovery in May 1989, radiometric observations for this asteroid at Arecibo and Goldstone Observatory rendered a rotation period of 12 hours (U=n.a.). According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 0.93 kilometers in diameter and its surface has a high albedo of 0.31–0.32, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 1.18 kilometers, based on an absolute magnitude of 17.0.