9175 Graun
Discovery Synodic rotation period | 20 h[4] 25.8±0.5 h[9] | |
---|---|---|
0.183±0.027[8] 0.20±0.09[7] 0.21 (assumed)[3] 0.308±0.042[5][6] | ||
S [3] | ||
12.2[1][3] · 12.25±0.38[10] · 12.4[8][5] · 12.66[7] | ||
9175 Graun, provisional designation 1990 OO2, is a stony Eunomian asteroid from the central region of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 29 July 1990, by American astronomer Henry E. Holt at Palomar Observatory in California, United States.[11] The asteroid was later named for American author and amateur astronomer Ken Graun.[2]
Orbit and classification
Graun is a member of the Eunomia family, a large group of S-type asteroids and the most prominent family in the intermediate main-belt. It orbits the Sun at a distance of 2.2–3.0 AU once every 4 years and 2 months (1,531 days). Its orbit has an eccentricity of 0.14 and an inclination of 15° with respect to the ecliptic.[1] In February 1975, it was first identified as 1975 CL at the Karl Schwarzschild Observatory, extending the body's observation arc by 15 years prior to its official discovery observation at Palomar.[11]
Alternative family
Based on its concurring orbital elements, Graun has also been group into the Maria family, which is named after its namesake, the asteroid 170 Maria.[4] It is an old-type asteroid family, about (3±1)×109 years old, located near the area of a 3:1 resonances with Jupiter that supplies near-Earth asteroids to the inner Solar System. It is estimated that every 100 million years, about 37 to 75 Maria asteroids larger than 1 kilometer become near-Earth objects.[9]
Physical characteristics
Lightcurves
In January 2013, a rotational
Diameter and albedo
According to the surveys carried out by the
The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.21 – derived from 15 Eunomia, the family's largest member and namesake – and calculates a diameter of 10.53 kilometers with an absolute magnitude of 12.2.[3]
Naming
This
References
- ^ a b c d "JPL Small-Body Database Browser: 9175 Graun (1990 OO2)" (2017-03-21 last obs.). Jet Propulsion Laboratory. Retrieved 22 June 2017.
- ^ ISBN 978-3-540-00238-3.
- ^ a b c d e f "LCDB Data for (9175) Graun". Asteroid Lightcurve Database (LCDB). Retrieved 24 July 2016.
- ^ . Retrieved 1 January 2016.
- ^ S2CID 35447010. Retrieved 24 July 2016.
- ^ S2CID 118745497. Retrieved 4 December 2016.
- ^ .
- ^ )
- ^ S2CID 119256964.
- S2CID 53493339. Retrieved 24 July 2016.
- ^ a b "9175 Graun (1990 OO2)". Minor Planet Center. Retrieved 24 July 2016.
- ^ "What's out tonight?". Ken Press. January 2016. Retrieved 1 January 2016.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 July 2016.
External links
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- 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
- 9175 Graun at AstDyS-2, Asteroids—Dynamic Site
- 9175 Graun at the JPL Small-Body Database