Astronomy:9524 O'Rourke
| Discovery [1] | |
|---|---|
| Discovered by | S. J. Bus |
| Discovery site | Siding Spring Obs. |
| Discovery date | 2 March 1981 |
| Designations | |
| (9524) O'Rourke | |
| Named after | Laurence O'Rourke (ESAC researcher)[2] |
| 1981 EJ5 · 1975 NU | |
| Minor planet category | main-belt · (inner) |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 41.90 yr (15,305 days) |
| |{{{apsis}}}|helion}} | 2.6928 AU |
| |{{{apsis}}}|helion}} | 1.7027 AU |
| 2.1978 AU | |
| Eccentricity | 0.2253 |
| Orbital period | 3.26 yr (1,190 days) |
| Mean anomaly | 335.52° |
| Mean motion | 0° 18m 9s / day |
| Inclination | 4.9414° |
| Longitude of ascending node | 286.97° |
| 9.9334° | |
| Physical characteristics | |
| Dimensions | 2.920±0.662 km[3] |
| Geometric albedo | 0.273±0.087[3] |
| Absolute magnitude (H) | 14.7[1] |
9524 O'Rourke, provisionally designated 1981 EJ5, is an asteroid from the inner regions of the asteroid belt, approximately 3 kilometers in diameter. It was discovered on 2 March 1981, by American astronomer Schelte Bus at the Siding Spring Observatory in New South Wales, Australia. The asteroid was named after Laurence O'Rourke, a researcher at the European Space Astronomy Centre.[2]
Orbit and classification
O'Rourke orbits the Sun in the inner main-belt at a distance of 1.7–2.7 AU once every 3 years and 3 months (1,190 days). Its orbit has an eccentricity of 0.23 and an inclination of 5° with respect to the ecliptic.[1] It was first observed as 1975 NU at Crimea–Nauchnij in 1975, extending the asteroid's observation arc by 6 years prior to its official discovery observation.[2]
Physical characteristics
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 2.920 kilometers in diameter and its surface has an albedo of 0.273.[3]
As of 2017, O'Rourke's spectral type, as well as its rotation period and shape remain unknown.[1][4]
Naming
This minor planet was named after Laurence O'Rourke (born 1970), a researcher at the European Space Astronomy Centre in Madrid, Spain, and a coordinator of ESA's Rosetta mission.[2][5] The approved naming citation was published by the Minor Planet Center on 12 July 2014 (M.P.C. 89078).[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 "JPL Small-Body Database Browser: 9524 O'Rourke (1981 EJ5)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2009524.
- ↑ 2.0 2.1 2.2 2.3 "9524 O'Rourke (1981 EJ5)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=9524.
- ↑ 3.0 3.1 3.2 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J. et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal 741 (2): 20. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M. Retrieved 10 March 2017.
- ↑ "LCDB Data for (9524) O'Rourke". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=9524%7CO'Rourke.
- ↑ "Asteroids Named After ESA Rosetta Scientists". ESA. http://blogs.esa.int/rosetta/2014/08/15/asteroids-named-after-esa-rosetta-scientists/.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html.
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
- 9524 O'Rourke at AstDyS-2, Asteroids—Dynamic Site
- 9524 O'Rourke at the JPL Small-Body Database
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