Astronomy:(7335) 1989 JA
![]() 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 | |
Minor planet category | 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) |
|{{{apsis}}}|helion}} | 2.6277 AU |
|{{{apsis}}}|helion}} | 0.9136 AU |
1.7706 AU | |
Eccentricity | 0.4840 |
Orbital period | 2.36 yr (861 days) |
Mean anomaly | 341.87° |
Mean motion | 0° 25m 5.88s / day |
Inclination | 15.196° |
Longitude of ascending node | 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Dimensions | 0.932±0.153 km[2] 1.18 km (calculated)[3] 1.8 km (outdated)[1] |
Rotation period | <12 h[4] |
Geometric albedo | 0.20 (assumed)[3] 0.31±0.30[3][5] 0.322±0.150[2][6] |
S[3] | |
Absolute magnitude (H) | 17.0[1][2][3] · 17.8±0.3[7] |
(7335) 1989 JA (provisional designation 1989 JA) is a 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] On 27 May 2022, the asteroid made a close approach 0.027 astronomical units (4.0×10 6 km; 2.5×10 6 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]
Date | JPL SBDB nominal geocentric distance |
uncertainty region (3-sigma) |
---|---|---|
2022-05-27 | 4024703 km | ± 153 km |
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 less than 12 hours ({{{1}}}).[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 2022, 1989 JA remains unnamed.[8]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "JPL Small-Body Database Browser: 7335 (1989 JA)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2007335. Retrieved 26 May 2017.
- ↑ 2.0 2.1 2.2 2.3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D. et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "LCDB Data for (7335)". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=7335%7C. Retrieved 26 September 2016.
- ↑ 4.0 4.1 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. doi:10.1016/S0032-0633(02)00002-8. Bibcode: 2002P&SS...50..257M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2002P&SS...50..257M. Retrieved 26 September 2016.
- ↑ 5.0 5.1 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. doi:10.1088/0004-637X/736/2/100. Bibcode: 2011ApJ...736..100M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...736..100M. Retrieved 26 September 2016.
- ↑ 6.0 6.1 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. doi:10.1088/0004-637X/743/2/156. Bibcode: 2011ApJ...743..156M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...743..156M. 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 26: 1511. Bibcode: 1995LPI....26.1511W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1995LPI....26.1511W. Retrieved 26 September 2016.
- ↑ 8.0 8.1 8.2 "7335 (1989 JA)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=7335. Retrieved 26 September 2016.
- ↑ Benner, Lance A. M.. "Goldstone Radar Observations Planning: (7335) 1989 JA, 388945 2008 TZ3, and 467460 2006 JF42". Asteroid Radar Research. Jet Propulsion Laboratory. https://echo.jpl.nasa.gov/asteroids/1989JA/1989JA.2022.goldstone.planning.html. Retrieved 15 June 2022.
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
- (7335) 1989 JA at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
- (7335) 1989 JA at ESA–space situational awareness
- (7335) 1989 JA at the JPL Small-Body Database
![]() | Original source: https://en.wikipedia.org/wiki/(7335) 1989 JA.
Read more |