 Radar images of 1989 JA and its satellite, imaged by theGoldstone 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 | 2.6277AU |
| Perihelion | 0.9136 AU |
| 1.7706 AU | |
| Eccentricity | 0.4840 |
| 2.36yr (861 days) | |
| 341.87° | |
| 0° 25m 5.88s / day | |
| Inclination | 15.196° |
| 61.325° | |
| 232.24° | |
| Earth MOID | 0.0225 AU · 8.8LD |
| Physical characteristics | |
| Dimensions | 0.932±0.153 km[2] 1.18 km(calculated)[3] 1.8 km(outdated)[1] |
| <12h[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] | |
(7335) 1989 JA (provisional designation1989 JA) is a stonyasteroid of theApollo group, classified asnear-Earth object andpotentially hazardous asteroid, approximately 1 kilometer in diameter. It was discovered on 1 May 1989, by American astronomerEleanor Helin at the U.S.Palomar Observatory in California.[8] On 27 May 2022, the asteroid made a close approach 0.027astronomical units (4.0×10^6 km; 2.5×10^6 mi) from Earth. During the close approach, optical observations detected signs of an orbitingsatellite, which was later confirmed by radar imaging at NASA'sGoldstone Solar System Radar in California.[9]
| Date | JPL SBDB nominal geocentric distance | uncertainty region (3-sigma) |
|---|---|---|
| 2022-05-27 | 4024703 km | ± 153 km |
TheS-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 aneccentricity of 0.48 and aninclination of 15° with respect to theecliptic.[1] The first observation was made at the discovering observatory in April 1989, extending the asteroid'sobservation arc by 1 month prior to its discovery observation.[8] It has aminimum orbital intersection distance to Earth of 0.0225 AU (3,370,000 km) which corresponds to 8.8lunar distances.[1]
During its discovery in May 1989,radiometric observations for this asteroid atArecibo andGoldstone Observatory rendered arotation period of less than 12 hours (U=n.a.).[4] According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer, the asteroid measures 0.93 kilometers in diameter and its surface has a highalbedo of 0.31–0.32,[2][5][6] while theCollaborative 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]
As of 2022,1989 JA remains unnamed.[8]
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