+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   2058 Roka (1938 BH) Classification: Main-belt Asteroid          SPK-ID: 2002058 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO250218 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1516477 n/a   a 3.1180044 n/a AU q 2.6451662 n/a AU i 2.54085 n/a deg node 95.47959 n/a deg peri 179.59338 n/a deg M 92.71748 n/a deg tp 2455882.5681327 (2011-Nov-17.06813270) n/a JED period 2011.0066865 5.51 n/a n/a d yr n 0.17901482 n/a deg/d Q 3.5908426 n/a AU   Orbit Determination Parameters    # obs. used (total)      1270      first obs. used      1938-??-??      last obs. used      2012-12-31      # oppositions      31      planetary ephem.      DE403      condition code      0      fit RMS      0.58      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.198  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 11.00 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 3 diameter diameter 21.36 km 3.1 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 3 rotation period rot_per 10.04 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List: [Addleman, D.; Covele, B.; Duncan, A.; Johnson, J.; et al. (2005) Minor Planet Bul. 32, 76-78.] [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.1542   0.056 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 3 2058 Roka           Discovered 1938 Jan. 22 by G. Kulin at Budapest. Named in memory of Gedeon Roka, a well-known popularizer of astronomy in Hungary for three decades. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC 5183 Last Updated: 2006-03-21 Alternate Designations  1938 BH = 1951 NP = 1962 NA = 1963 UM = 1974 SZ1 = 1978 AE = 1985 UL3  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-24 05:15 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin