| 词条 | 39890 Bobstephens |
| 释义 |
| minorplanet = yes | name = 39890 Bobstephens | background = #D6D6D6 | image = | image_size = | caption = | discovery_ref = | discovered = 23 March 1998 | discoverer = P. Pravec | discovery_site = Ondřejov Obs. | mpc_name = (39890) Bobstephens | alt_names = {{mp|1998 FA|3}} | pronounced = | named_after = Robert D. Stephens {{nowrap|{{small|(American astronomer)}}[2]}} | mp_category = main-belt{{·}}{{small|(middle)}} | orbit_ref = | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 0 | observation_arc = 21.25 yr (7,760 days) | aphelion = 3.1534 AU | perihelion = 2.0287 AU | semimajor = 2.5910 AU | eccentricity = 0.2170 | period = 4.17 yr (1,523 days) | mean_anomaly = 201.46° | mean_motion = {{Deg2DMS|0.2363|sup=ms}} / day | inclination = 5.4950° | asc_node = 161.73° | arg_peri = 95.752° | dimensions = 2.06 km {{small|(calculated)}}[4] | rotation = {{val|9.55|0.01}} h[5] | albedo = 0.20 {{small|(assumed)}}[4] | spectral_type = S [4] | abs_magnitude = 15.8[4]{{·}}15.9 }}39890 Bobstephens, provisional designation {{mp|1998 FA|3}}, is a stony asteroid from the middle region of the asteroid belt, approximately 2 kilometers in diameter. The asteroid was discovered on 23 March 1998, by Czech astronomer Petr Pravec at Ondřejov Observatory near Prague in the Czech Republic.[10] It was named for American astronomer Robert Stephens.[2] Orbit and classificationBobstephens orbits the Sun in the central main-belt at a distance of 2.0–3.2 AU once every 4 years and 2 months (1,523 days). Its orbit has an eccentricity of 0.22 and an inclination of 5° with respect to the ecliptic. It was first imaged at Steward Observatory in 1995. This precovery extends the body's observation arc by 3 years prior to its official discovery observation.[10]Physical characteristicsRotation periodIn August 2008, a rotational lightcurve of Bobstephens was obtained from photometric observations by American amateur astronomer Daniel Coley at the Center for Solar System Studies in California. Light-curve analysis gave a rotation period of 9.55 hours with a brightness variation of 0.20 magnitude ({{small|U=2}}).[5] Diameter and albedoThe Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 2.06 kilometers with an absolute magnitude of 15.8.[4] NamingThis minor planet was named for Californian amateur astronomer and photometrist Robert D. Stephens (born 1955), who is an expert in lightcurve photometry of minor planets since 1999.[2] The official naming citation was published by the Minor Planet Center on 24 July 2002 ({{small|M.P.C. 46112}}).[17] References1. ^1 2 3 {{cite book |title = Dictionary of Minor Planet Names – (39890) Bobstephens |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 894 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_10020 |chapter = (39890) Bobstephens }} [1][2][3][4][5]2. ^1 2 {{cite web |title = 39890 Bobstephens (1998 FA3) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=39890 |accessdate = 27 December 2016}} 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 = 27 December 2016}} 4. ^1 2 3 4 5 {{cite web |title = LCDB Data for (39890) Bobstephens |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=39890%7CBobstephens |accessdate = 27 December 2016}} 5. ^1 2 {{Cite journal |author = Coley, Daniel |date = January 2012 |title = Asteroid Lightcurve Analysis at the Danhenge Observatory Apr - Aug 2011 |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012MPBu...39...23C |journal = The Minor Planet Bulletin |volume = 39 |issue = 1 |pages = 23–24 |issn = 1052-8091 |bibcode = 2012MPBu...39...23C |access-date= 27 December 2016}} }} External links
5 : Background asteroids|Discoveries by Petr Pravec|Minor planets named for people|Named minor planets|Astronomical objects discovered in 1998 |
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