+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   1131 Porzia (1929 RO) Classification: Mars-crossing Asteroid          SPK-ID: 2001131 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO256870 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.2857345 n/a   a 2.2291808 n/a AU q 1.5922269 n/a AU i 3.22931 n/a deg node 100.72224 n/a deg peri 248.14354 n/a deg M 50.96414 n/a deg tp 2456228.4009122 (2012-Oct-27.90091220) n/a JED period 1215.6718745 3.33 n/a n/a d yr n 0.29613254 n/a deg/d Q 2.8661347 n/a AU   Orbit Determination Parameters    # obs. used (total)      1474      first obs. used      1929-??-??      last obs. used      2012-12-18      # oppositions      25      planetary ephem.      DE403      condition code      0      fit RMS      0.54      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.587  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.0 mag n/a PDS3 (MPC 17261)   rotation period rot_per 4.6584 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List: [Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Benishek, V.; Protitch-Benishek, V. (2010) Minor Planet Bul. 37, 64-65.] SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 1131 Porzia (1929 RO)          Discovered 1929-Sep-10 by Reinmuth, K. at Heidelberg (024) Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1929 RO = 1939 TJ = 1962 MB  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-23 20:15 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin