| 词条 | 2285 Ron Helin |
| 释义 |
| minorplanet = yes | name = 2285 Ron Helin | background = #D6D6D6 | image = | image_size = | caption = | discovery_ref = | discovered = 27 August 1976 | discoverer = S. J. Bus | discovery_site = Palomar Obs. | mpc_name = (2285) Ron Helin | alt_names = 1976 QB | named_after = Ronald P. Helin {{small|husband of astronomer}} Eleanor F. Helin[2] | mp_category = main-belt{{·}}Flora [3] | orbit_ref = | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 0 | observation_arc = 40.54 yr (14,807 days) | aphelion = 2.6815 AU | perihelion = 1.7578 AU | semimajor = 2.2197 AU | eccentricity = 0.2081 | period = 3.31 yr (1,208 days) | mean_anomaly = 139.05° | mean_motion = {{Deg2DMS|0.2980|sup=ms}} / day | inclination = 5.3339° | asc_node = 157.85° | arg_peri = 182.81° | dimensions = 4.11 km {{small|(calculated)}}[3] | rotation = 12 h[6] | albedo = 0.24 {{small|(assumed)}}[3] | spectral_type = S [3] | abs_magnitude = 14.0{{·}}14.1[3] }}2285 Ron Helin, provisional designation {{mp|1976 QB}}, is a stony Florian asteroid from the inner region of the asteroid belt, approximately 4 kilometers in diameter. It was discovered on 27 August 1976, by American astronomer Schelte Bus at Palomar Observatory in San Diego County, California.[11] Orbit and characterizationRon Helin is a member of the Flora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 1.8–2.7 AU once every 3 years and 4 months (1,208 days). Its orbit has an eccentricity of 0.21 and an inclination of 5° with respect to the ecliptic. Its rotation period is 12 hours.NamingThis minor planet was named in honor of Ronald Helin, husband of American astronomer Eleanor Helin (1932–2009), in appreciation of his support of the Palomar Planet-Crossing Asteroid Survey (PCAS).[2] The approved naming citation was published by the Minor Planet Center on 11 December 1981 ({{small|M.P.C. 6531}}).[14] References1. ^1 2 {{cite book |title = Dictionary of Minor Planet Names – (2285) Ron Helin |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 186 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_2286 |chapter = (2285) Ron Helin }} [1][2][3][4][5]2. ^1 {{cite web |title = 2285 Ron Helin (1976 QB) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=2285 |accessdate = 19 June 2017}} 3. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = http://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 19 June 2017}} 4. ^1 {{cite web |title = Asteroids and comets rotation curves – (2285) Ron Helin |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page4cou.html#002285 |accessdate = 19 June 2017}} 5. ^1 2 3 4 5 {{cite web |title = LCDB Data for (2285) Ron Helin |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=2285%7CRon%20Helin |accessdate = 19 June 2017}} }} External links
5 : Flora asteroids|Discoveries by Schelte J. Bus|Minor planets named for people|Named minor planets|Astronomical objects discovered in 1976 |
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