9524 O'Rourke
{{Short description|Asteroid}}
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 9524 O'Rourke
| background = #D6D6D6
| image =
| image_size =
| caption =
| discovered = 2 March 1981
| discoverer = S. J. Bus
| discovery_site = Siding Spring Obs.
| mpc_name = (9524) O'Rourke
| alt_names = {{mp|1981 EJ|5}}{{·}}1975 NU
| named_after = Laurence O'Rourke
{{small|(ESAC researcher)}}
| mp_category = main-belt{{·}}{{small|(inner)}}
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 41.90 yr (15,305 days)
| aphelion = 2.6928 AU
| perihelion = 1.7027 AU
| semimajor = 2.1978 AU
| eccentricity = 0.2253
| period = 3.26 yr (1,190 days)
| mean_anomaly = 335.52°
| mean_motion = {{Deg2DMS|0.3025|sup=ms}} / day
| inclination = 4.9414°
| asc_node = 286.97°
| arg_peri = 9.9334°
| dimensions = {{val|2.920|0.662}} km
| rotation =
| albedo = {{val|0.273|0.087}}
| spectral_type =
}}
9524 O'Rourke, provisionally designated {{mp|1981 EJ|5}}, 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.
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. It was first observed as {{mp|1975 NU}} at Crimea–Nauchnij in 1975, extending the asteroid's observation arc by 6 years prior to its official discovery observation.
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.
As of 2017, O'Rourke{{'}}s spectral type, as well as its rotation period and shape remain unknown.
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. The approved naming citation was published by the Minor Planet Center on 12 July 2014 ({{small|M.P.C. 89078}}).
References
{{reflist|refs=
|type = 2017-06-05 last obs.
|title = JPL Small-Body Database Browser: 9524 O'Rourke (1981 EJ5)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2009524
|publisher = Jet Propulsion Laboratory
|access-date = 22 June 2017}}
|title = 9524 O'Rourke (1981 EJ5)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=9524
|access-date = 10 March 2017}}
|title = Asteroids Named After ESA Rosetta Scientists
|publisher = ESA
|url = http://blogs.esa.int/rosetta/2014/08/15/asteroids-named-after-esa-rosetta-scientists/
|access-date = 18 August 2014}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|access-date = 10 March 2017}}
|display-authors = 6
|first1 = Joseph R. |last1 = Masiero
|first2 = A. K. |last2 = Mainzer
|first3 = T. |last3 = Grav
|first4 = J. M. |last4 = Bauer
|first5 = R. M. |last5 = Cutri
|first6 = J. |last6 = Dailey
|first7 = P. R. M. |last7 = Eisenhardt
|first8 = R. S. |last8 = McMillan
|first9 = T. B. |last9 = Spahr
|first10 = M. F. |last10 = Skrutskie
|first11 = D. |last11 = Tholen
|first12 = R. G. |last12 = Walker
|first13 = E. L. |last13 = Wright
|first14 = E. |last14 = DeBaun
|first15 = D. |last15 = Elsbury
|first16 = T. IV |last16 = Gautier
|first17 = S. |last17 = Gomillion
|first18 = A. |last18 = Wilkins
|date = November 2011
|title = Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M
|journal = The Astrophysical Journal
|volume = 741
|issue = 2
|page = 20
|bibcode = 2011ApJ...741...68M
|doi = 10.1088/0004-637X/741/2/68
|arxiv = 1109.4096
|access-date= 10 March 2017}}
|title = LCDB Data for (9524) O'Rourke
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=9524%7CO'Rourke
|access-date = 10 March 2017}}
}}
External links
- [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
- [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
- [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs005001.html Discovery Circumstances: Numbered Minor Planets (5001)-(10000)] – Minor Planet Center
- {{AstDys|9524}}
- {{JPL small body}}
{{Minor planets navigator |9523 Torino |number=9524 |9525 Amandasickafoose}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:ORourke}}