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(6491) 1991 OA

Highly eccentric stony asteroid

Field	Value
minorplanet	yes
name	(6491) 1991 OA
background	#FFC2E0
discovery_ref
discovered	16 July 1991
discoverer	H. E. Holt
discovery_site	Palomar Obs.
mpc_name	(6491) 1991 OA
mp_category	NEOAmorPHA
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	0
observation_arc	24.35 yr (8,895 days)
aphelion	3.9772 AU
perihelion	1.0227 AU
semimajor	2.5000 AU
eccentricity	0.5909
period	3.95 yr (1,444 days)
mean_anomaly	215.03°
mean_motion	/ day
inclination	5.9464°
asc_node	301.90°
arg_peri	323.60°
moid	0.0420 AU16.4 LD
dimensions	0.52 km (derived)
rotation	h
albedo	0.20 (assumed)
spectral_type	S
abs_magnitude	18.7718.9

**** is a highly eccentric, stony asteroid, classified as near-Earth object and potentially hazardous asteroid, approximately 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.

Orbit and classification

The S-type body is an Amor asteroid – a subgroup of near-Earth asteroids that approach the orbit of Earth from beyond, but do not cross it. It orbits the Sun at a distance of 1.0–4.0 AU once every 3 years and 11 months (1,444 days). Its orbit has an eccentricity of 0.59 and an inclination of 6° with respect to the ecliptic. Its minimum orbit intersection distance (MOID) with Earth is 0.0420 AU, and on 1 August 2086, it will make a close approach and pass by Earth at a distance of 0.09 AU.

A first precovery was taken at the Australian Siding Spring Observatory in March 1991, extending the asteroid's observation arc by 4 months prior to its discovery.

Physical characteristics

In 2000, a rotational lightcurve was published from photometric observations obtained by the Near-Earth Objects Follow-up Program during the early 1990s. The lightcurve rendered a rotation period of 2.69 hours with an brightness amplitude of 0.08 in magnitude (). The Collaborative Asteroid Lightcurve Link (CALL) assumes an albedo of 0.20 and derives a diameter of 0.53 kilometers, based on an absolute magnitude of 18.77.

Naming

As of 2017, remains unnamed.

References

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

amor-asteroids discoveries-by-henry-e.-holt potentially-hazardous-asteroids astronomical-objects-discovered-in-1991

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