Astronomy:(8201) 1994 AH2

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(8201) 1994 AH2
Discovery[1]
Discovered byG. J. Garradd
Discovery siteSiding Spring Obs.
Discovery date5 January 1994
Designations
(8201) 1994 AH2
1994 AH2
Minor planet categoryApollo · NEO[1]
Alinda group
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc34.86 yr (12,731 days)
|{{{apsis}}}|helion}}4.3322 AU
|{{{apsis}}}|helion}}0.7436 AU
2.5379 AU
Eccentricity0.7070
Orbital period4.04 yr (1,477 days)
Mean anomaly285.46°
Mean motion0° 14m 37.68s / day
Inclination9.5538°
Longitude of ascending node164.12°
25.120°
Earth MOID0.1012 AU · 39.4 LD
Jupiter MOID0.6611 AU
Physical characteristics
Dimensions1.859±0.183 km[2][3]
2.17 km (calculated)[4]
2.2 km[5]
Rotation period23.949 h[5][6]
24 h[lower-alpha 1]
Geometric albedo0.15 (estimated)[5]
0.154±0.042[2][3]
0.18 (assumed)[4]
SMASS=O[1] · O[4][5]
Absolute magnitude (H)15.8[1][4] · 16.3[2][5]


(8201) 1994 AH2 is a highly eccentric, rare-type asteroid, classified as near-Earth object of the Apollo group of asteroids, approximately 2 kilometers in diameter. It was discovered on 5 January 1994, by Australian amateur astronomer Gordon Garradd during the AANEAS survey at the Siding Spring Observatory, Australia.[7] It has an Earth minimum orbit intersection distance of 0.1 astronomical unit|AU (15 million km) and is associated with the Beta Taurids daytime meteor shower.[8]

Orbit and classification

The asteroid orbits the Sun at a distance of 0.7–4.3 AU once every 4.04 years (1,477 days). Its orbit has an eccentricity of 0.71 and an inclination of 10° with respect to the ecliptic.[1] It is a member of the Alinda group of asteroids with a 3:1 resonance with Jupiter that has excited the eccentricity of the orbit over the eons.[9] As an Alinda asteroid it makes approaches to Jupiter, Earth, and Venus.[10]

1994 AH2 has an Earth minimum orbital intersection distance of 0.1012 AU (15,100,000 km), which corresponds to 39.4 lunar distances. Due to its elongated orbit, it also approaches the orbit of Jupiter within 0.1022 AU (15,300,000 km).[1] On 4 January 2079, it will pass 0.3595 astronomical unit|AU (53,800,000 km) from the Earth.[10]

A first precovery was taken at the discovering observatory in 1981, extending the asteroid's observation arc by 13 years prior to its discovery.[7]

Physical characteristics

In the SMASS classification, 1994 AH2 is characterized as a rare O-type asteroid.[1]

Rotation period

In the late 1990s, Czech astronomer Petr Pravec obtained two rotational lightcurves for this asteroid from photometric observations taken at the Ondřejov Observatory, Czech Republic. They gave a longer-than average rotation period of 23.949 and 24 hours with a brightness variation of 0.27 and 0.3 magnitude, respectively ({{{1}}}).[6][lower-alpha 1]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 1.86 kilometers in diameter and its surface has an albedo of 0.154.[2][3] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.18 and calculates a diameter of 2.17 kilometers, based on an absolute magnitude of 15.8.[4] American astronomer Richard Binzel gives a diameter of 2.2 kilometers.[5]

Naming

As of 2017, 1994 AH2 remains unnamed.[7]

Notes

  1. ↑ 1.0 1.1 Pravec (1998) web: Observation from 15 July 1998. Rotation period 24 hours with a brightness amplitude of 0.3 mag. No quality rating available. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (8201) and Pravec, P.; Wolf, M.; Sarounova, L. (1998)

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "JPL Small-Body Database Browser: 8201 (1994 AH2)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2008201;cad=1. 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 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. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 "LCDB Data for (8201)". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=8201%7C. Retrieved 1 September 2016. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Binzel, R. P.; Lupishko, D.; di Martino, M.; Whiteley, R. J.; Hahn, G. J. (March 2002). "Physical Properties of Near-Earth Objects". Asteroids III: 255–271. Bibcode: 2002aste.book..255B. http://www.lpi.usra.edu/books/AsteroidsIII/pdf/3048.pdf. Retrieved 1 September 2016. 
  6. ↑ 6.0 6.1 Pravec, Petr; Sarounová, Lenka; Wolf, Marek (December 1996). "Lightcurves of 7 Near-Earth Asteroids". Icarus 124 (2): 471–482. doi:10.1006/icar.1996.0223. Bibcode: 1996Icar..124..471P. 
  7. ↑ 7.0 7.1 7.2 "8201 (1994 AH2)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=8201. Retrieved 1 September 2016. 
  8. ↑ Babadzhanov, P. B. (2001). "Search for meteor showers associated with Near-Earth Asteroids". Astronomy and Astrophysics 373 (1): 329–335. doi:10.1051/0004-6361:20010583. Bibcode: 2001A&A...373..329B. 
  9. ↑ John S Lewis (2015-08-03). "The Alinda Family of Asteroids". http://www.johnslewis.com/2015/08/the-alinda-family-of-asteroids.html. Retrieved 2019-06-26. 
  10. ↑ 10.0 10.1 "JPL Close-Approach Data: 8201 (1994 AH2)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=8201;cad=1#cad. Retrieved 1 September 2016. 

External links



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