(6491) 1991 OA
| Discovery [1] | |
|---|---|
| Discovered by | H. E. Holt |
| Discovery site | Palomar Obs. |
| Discovery date | 16 July 1991 |
| Designations | |
| (6491) 1991 OA | |
| NEO · Amor · PHA[1] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 24.35 yr (8,895 days) |
| Aphelion | 3.9776 AU |
| Perihelion | 1.0242 AU |
| 2.5009 AU | |
| Eccentricity | 0.5904 |
| 3.96 yr (1,445 days) | |
| 15.607° | |
| Inclination | 5.9436° |
| 301.93° | |
| 323.58° | |
| Earth MOID | 0.0429 AU |
| Physical characteristics | |
| Dimensions | 0.52 km (derived)[2] |
| 2.69 h[3] | |
| 0.20 (assumed)[2] | |
| S [2] | |
| 18.9[1] | |
(6491) 1991 OA is a highly eccentric, stony asteroid, classified as near-Earth object and potentially hazardous asteroid, about half a kilometer in diameter. It was discovered on 16 July 1991, by American astronomer Henry E. Holt at the U.S. Palomar Observatory in California.[4]
The asteroid is an Amor asteroid – a subgroup of near-Earth asteroids that approach the orbit of Earth from beyond, but do not cross it. Its Earth Minimum orbit intersection distance (MOID) is 0.0429 AU, and on 1 August 2086, it will make a close approach and pass by Earth at a distance of 0.09 AU (13,000,000 km).[5]
The S-type asteroid orbits the Sun at a distance of 1.0–4.0 AU once every 3 years and 12 months (1,445 days). Its orbit shows an very high eccentricity of 0.59 and an inclination of 6 degrees from the plane of the ecliptic.[1] A photometric light-curve analysis rendered a rotation period of 2.69 hours with an brightness amplitude of 0.08 in magnitude.[3] The Collaborative Asteroid Lightcurve Link (CALL) assumes an albedo of 0.20 and derives a diameter of 0.53 kilometers.[2]
References
- ^ a b c d e "JPL Small-Body Database Browser: 6491 (1991 OA)" (2015-07-25 last obs.). Jet Propulsion Laboratory. Retrieved January 2016.
{{cite web}}: Check date values in:|accessdate=(help) - ^ a b c d "LCDB Data for (6491)". Asteroid Lightcurve Database (LCDB). Retrieved January 2016.
{{cite web}}: Check date values in:|accessdate=(help) - ^ a b Erikson, A.; Mottola, S.; Lagerros, J. S. V.; Lindgren, M.; Piironen, J.; Oja, T.; et al. (October 2000). "The Near-Earth Objects Follow-up Program. III. 32 Lightcurves for 12 Objects from 1992 and 1995". Icarus. 147 (2): 487–497. Bibcode:2000Icar..147..487E. doi:10.1006/icar.2000.6457. Retrieved January 2016.
{{cite journal}}: Check date values in:|access-date=(help) - ^ "6491 (1991 OA)". Minor Planet Center. Retrieved January 2016.
{{cite web}}: Check date values in:|accessdate=(help) - ^ "JPL Close-Approach Data: 6491 (1991 OA)". Retrieved 2012-03-24.
2011-09-29 last obs
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
- (6491) 1991 OA at the JPL Small-Body Database
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