(7335) 1989 JA
Near-Earth asteroid in 2022
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(7335) 1989 JA (provisional designation 1989 JA) is a stony asteroid of the Apollo group, classified as a 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.[8] On 27 May 2022, the asteroid made a close approach 0.027 astronomical units (4.0Ã106 km; 2.5Ã106 mi) from Earth. During the close approach, optical observations detected signs of an orbiting satellite, which was later confirmed by radar imaging at NASA's Goldstone Solar System Radar in California.[9]
Radar images of 1989 JA and its satellite, imaged by the Goldstone observatory in May 2022 | |
| Discovery[1] | |
|---|---|
| Discovered by | E. F. Helin |
| Discovery site | Palomar Obs. |
| Discovery date | 1 May 1989 |
| Designations | |
| (7335) 1989 JA | |
| 1989 JA | |
| Apollo · NEO · PHA[1] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 27.98 yr (10,221 days) |
| Aphelion | 2.6277 AU |
| Perihelion | 0.9136 AU |
| 1.7706 AU | |
| Eccentricity | 0.4840 |
| 2.36 yr (861 days) | |
| 341.87° | |
| 0° 25m 5.88s / day | |
| Inclination | 15.196° |
| 61.325° | |
| 232.24° | |
| Earth MOID | 0.0225 AU · 8.8 LD |
| Physical characteristics | |
| Dimensions | 0.932±0.153 km[2] 1.18 km (calculated)[3] 1.8 km (outdated)[1] |
| <12 h[4] | |
| 0.20 (assumed)[3] 0.31±0.30[3][5] 0.322±0.150[2][6] | |
| S[3] | |
| 17.0[1][2][3] · 17.8±0.3[7] | |
Orbit and classification
The S-type asteroid orbits the Sun at a distance of 0.9â2.6 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.[1] 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.[8] It has a minimum orbital intersection distance to Earth of 0.0225 AU (3,370,000 km) which corresponds to 8.8 lunar distances.[1]
Physical characteristics
During its discovery in May 1989, radiometric observations for this asteroid at Arecibo and Goldstone Observatory rendered a rotation period of less than 12 hours (U=n.a.).[4] 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 0.31â0.32,[2][5][6] 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.[3]
Naming
As of 2022, 1989 JA remains unnamed.[8]