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10502 Armaghobs

Rare-type Mars-crossing asteroid

Field	Value
minorplanet	yes
name	10502 Armaghobs
background	#FA8072
discovery_ref
discovered	22 August 1987
discoverer	E. F. Helin
discovery_site	Palomar Obs.
mpc_name	(10502) Armaghobs
alt_names

pronounced
named_after	Armagh Observatory
(in Northern Ireland)
mp_category	Mars-crosser
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	0
observation_arc	36.73 yr (13,416 days)
aphelion	3.0439 AU
perihelion	1.5745 AU
semimajor	2.3092 AU
eccentricity	0.3182
period	3.51 yr (1,282 days)
mean_anomaly	145.86°
mean_motion	/ day
inclination	21.927°
asc_node	170.23°
arg_peri	263.26°
dimensions	km
2.97 km (calculated)
rotation	h
albedo	0.20 (assumed)

spectral_type	SQ
abs_magnitude	15.015.18

(in Northern Ireland) 2.97 km (calculated)

10502 Armaghobs ( ), provisional designation , is an eccentric, rare-type stony asteroid and Mars-crosser from the inner regions of the asteroid belt, approximately 2.6 kilometers in diameter. The asteroid was discovered on 22 August 1987, by American astronomer Eleanor Helin at the Palomar Observatory in California, United States. It was named for the Armagh Observatory in Northern Ireland.

Orbit and classification

Armaghobs orbits the Sun in the inner main-belt at a distance of 1.6–3.0 AU once every 3 years and 6 months (1,282 days). Its orbit has an eccentricity of 0.32 and an inclination of 22° with respect to the ecliptic. It was first identified as at ESO's La Silla Observatory in 1980, extending the body's observation arc by 7 years prior to its official discovery observation at Palomar.

Physical characteristics

The Armaghobs has been characterized as a relatively rare Q-type asteroid by Pan-STARRS photometric survey.

Lightcurve

In February 2013, a rotational lightcurve of Armaghobs was obtained from photometric observations by Kevin Hills at the Riverland Dingo Observatory at Moorook, South Australia. Lightcurve analysis gave a rotation period of hours with a brightness variation of 0.51 magnitude ().

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Armaghobs measures 2.61 kilometers in diameter and its surface has an albedo of 0.22. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20, and calculates a diameter of 2.97 kilometers with an absolute magnitude of 15.0.

Naming

This minor planet was named after the Armagh Observatory in Northern Ireland. The present-day astronomical research institute was founded by Archbishop Richard Robinson in 1790. The Estonian astronomer Ernst Öpik, after whom 2099 Öpik is named, had been a long-time member of the Observatory. It is also known for the invention of the cup-anemometer by Thomas Robinson, the New General Catalogue compiled by John Dreyer, and Lindsay's Armagh-Dunsink-Harvard telescope. The official naming citation was published by the Minor Planet Center on 9 January 2001 (M.P.C. 41937).

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.

mars-crossing-asteroids discoveries-by-eleanor-f.-helin named-minor-planets astronomical-objects-discovered-in-1987

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