Astronomy:(7335) 1989 JA

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Short description: Near-Earth asteroid in 2022
(7335) 1989 JA
Radar images of 1989 JA and its satellite, imaged by the Goldstone observatory in May 2022
Discovery[1]
Discovered byE. F. Helin
Discovery sitePalomar Obs.
Discovery date1 May 1989
Designations
(7335) 1989 JA
1989 JA
Minor planet categoryApollo · NEO · PHA[1]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc27.98 yr (10,221 days)
|{{{apsis}}}|helion}}2.6277 AU
|{{{apsis}}}|helion}}0.9136 AU
1.7706 AU
Eccentricity0.4840
Orbital period2.36 yr (861 days)
Mean anomaly341.87°
Mean motion0° 25m 5.88s / day
Inclination15.196°
Longitude of ascending node61.325°
232.24°
Earth MOID0.0225 AU · 8.8 LD
Physical characteristics
Dimensions0.932±0.153 km[2]
1.18 km (calculated)[3]
1.8 km (outdated)[1]
Rotation period<12 h[4]
Geometric albedo0.20 (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]

2022 close approach[1]
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. ↑ 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. ↑ 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. ↑ 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. ↑ 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. ↑ 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. ↑ 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. 
  7. ↑ 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. ↑ 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. 
  9. ↑ 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. 



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