(7335) 1989 JA
| 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| Dimensions | 0.932±0.153 km[2] 1.18 km (calculated)[3] 1.8 km (outdated)[1] |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] | |
(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.[8]
Orbit and classification
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.[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 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 0.31–0.32,[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 2017, 1989 JA remains unnamed.[8]
References
- ^ a b c d e f g "JPL Small-Body Database Browser: 7335 (1989 JA)" (2017-03-31 last obs.). Jet Propulsion Laboratory. Retrieved 26 May 2017.
- ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 26 September 2016.
- ^ a b c d e f "LCDB Data for (7335)". Asteroid Lightcurve Database (LCDB). Retrieved 26 September 2016.
- ^ a b Mahapatra, Pravas R.; Benner, Lance A. M.; Ostro, Steven J.; Jurgens, Raymond F.; Giorgini, Jon D.; Yeomans, Donald K.; et al. (March 2002). "Radar observations of asteroid 7335 ( 1989 JA)". Planetary and Space Science. 50 (3): 257–260. Bibcode:2002P&SS...50..257M. doi:10.1016/S0032-0633(02)00002-8. Retrieved 26 September 2016.
- ^ a b Mainzer, A.; Grav, T.; Masiero, J.; Bauer, J.; Wright, E.; Cutri, R. M.; et al. (August 2011). "Thermal Model Calibration for Minor Planets Observed with Wide-field Infrared Survey Explorer/NEOWISE". The Astrophysical Journal. 736 (2): 9. Bibcode:2011ApJ...736..100M. doi:10.1088/0004-637X/736/2/100. Retrieved 26 September 2016.
- ^ a b Mainzer, A.; Grav, T.; Bauer, J.; Masiero, J.; McMillan, R. S.; Cutri, R. M.; et al. (December 2011). "NEOWISE Observations of Near-Earth Objects: Preliminary Results". The Astrophysical Journal. 743 (2): 17. Bibcode:2011ApJ...743..156M. doi:10.1088/0004-637X/743/2/156. Retrieved 26 September 2016.
- ^ Wisniewski, W. Z.; Michalowski, T. M.; Harris, A. W.; McMillan, R. S. (March 1995). "Photoelectric Observations of 125 Asteroids". Abstracts of the Lunar and Planetary Science Conference. Bibcode:1995LPI....26.1511W. Retrieved 26 September 2016.
- ^ a b c "7335 (1989 JA)". Minor Planet Center. Retrieved 26 September 2016.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- (7335) 1989 JA at the JPL Small-Body Database