(8201) 1994 AH2
| Discovery [1] | |
|---|---|
| Discovered by | G. J. Garradd |
| Discovery site | Siding Spring Obs. |
| Discovery date | 5 January 1994 |
| Designations | |
| MPC designation | (8201) 1994 AH2 |
| 1994 AH2 | |
| Apollo · NEO [1] | |
| Orbital characteristics [1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 34.70 yr (12,673 days) |
| Aphelion | 4.3328 AU |
| Perihelion | 0.7437 AU |
| 2.5382 AU | |
| Eccentricity | 0.7070 |
| 4.04 yr (1,477 days) | |
| 188.01° | |
| 0° 14m 37.32s / day | |
| Inclination | 9.5556° |
| 164.13° | |
| 25.096° | |
| Earth MOID | 0.1022 AU |
| Jupiter MOID | 0.6608 AU |
| Physical characteristics | |
| Dimensions |
1.859±0.183 km[2] 2.17 km (calculated)[3] 2.2 km[4] |
|
23.949 h[4][5] 24 h[lower-alpha 1] | |
|
0.15 (estimated)[4] 0.154±0.042[2] 0.18 (assumed)[3] | |
| SMASS = O [1] · O [3][4] | |
|
15.8[1][3] 16.3[2][4] | |
|
| |
(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.[6]
The rare O-type 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 has an Earth minimum orbital intersection distance of 0.1022 AU (15,300,000 km), which corresponds to 39.8 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 AU (53,800,000 km) from the Earth.[7] The first precovery was taken at the discovering observatory in 1981, extending the asteroid's observation arc by 13 years prior to its discovery.[6]
In the late 1990s, Czech astronomer Petr Pravec obtained two rotational light-curves 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 (U=2/n.a.).[5][lower-alpha 1]
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] 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.[3] American astronomer Richard Binzel gives a diameter of 2.2 kilometers.[4]
References
- 1 2 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)
- 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 8201 (1994 AH2)" (2016-08-27 last obs.). Jet Propulsion Laboratory. Retrieved 1 September 2016.
- 1 2 3 4 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 1 September 2016. - 1 2 3 4 5 "LCDB Data for (8201)". Asteroid Lightcurve Database (LCDB). Retrieved 1 September 2016.
- 1 2 3 4 5 6 Binzel, R. P.; Lupishko, D.; di Martino, M.; Whiteley, R. J.; Hahn, G. J. (March 2002). "Physical Properties of Near-Earth Objects" (PDF). Asteroids III – Lunar and Planetary Institute: 255–271. Bibcode:2002aste.book..255B. Retrieved 1 September 2016.
- 1 2 Pravec, Petr; Sarounová, Lenka; Wolf, Marek (December 1996). "Lightcurves of 7 Near-Earth Asteroids". Icarus. 124 (2): 471–482. Bibcode:1996Icar..124..471P. doi:10.1006/icar.1996.0223. Retrieved 1 September 2016.
- 1 2 "8201 (1994 AH2)". Minor Planet Center. Retrieved 1 September 2016.
- ↑ "JPL Close-Approach Data: 8201 (1994 AH2)" (2016-08-27 last obs.). Jet Propulsion Laboratory. Retrieved 1 September 2016.
External links
- AANEAS: A Valedictory Report, AANEAS Discoveries 1990-96
- 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
- (8201) 1994 AH2 at the JPL Small-Body Database
