10502 Armaghobs

10502 Armaghobs
Discovery
Discovered byE. F. Helin
Discovery sitePalomar Obs.
Discovery date22 August 1987
Designations
(10502) Armaghobs
Pronunciation/ɑːrˈmɑːəbz/ ar-MAH-əbs
Named after
Armagh Observatory
(in Northern Ireland)
1987 QF6 · 1980 PJ2
1994 RJ29
Mars-crosser
Orbital characteristics
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc36.73 yr (13,416 days)
Aphelion3.0439 AU
Perihelion1.5745 AU
2.3092 AU
Eccentricity0.3182
3.51 yr (1,282 days)
145.86°
0° 16m 51.24s / day
Inclination21.927°
170.23°
263.26°
Physical characteristics
Dimensions2.61±0.59 km
2.97 km (calculated)
24.978±0.002 h
0.20 (assumed)
0.22±0.14
S · Q
15.0 · 15.18 · 15.44±0.08

10502 Armaghobs (/ɑːrˈmɑːəbz/ ar-MAH-əbz), provisional designation 1987 QF6, 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 1980 PJ2 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 24.978 hours with a brightness variation of 0.51 magnitude (U=2).

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).


This page was last updated at 2023-03-06 09:56 UTC. Update now. View original page.

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