+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1131 Porzia (1929 RO) Classification: Mars-crossing Asteroid          SPK-ID: 2001131 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 43 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2860157489184847 1.4378e-08   a 2.228500998801459 3.9867e-09 au q 1.591114616663668 3.2544e-08 au i 3.229788108592644 5.0997e-07 deg node 100.6717977534321 1.3194e-05 deg peri 248.0869997467778 1.4296e-05 deg M 218.6305636054679 4.3093e-06 deg tp 2459873.667331002175 (2022-Oct-21.16733100) 1.5291e-05 TDB period 1215.115823772408 3.33 3.2607e-06 8.927e-09 d yr n .2962680535937358 7.9501e-10 deg/d Q 2.865887380939249 5.1269e-09 au   Orbit Determination Parameters    # obs. used (total)      3509      data-arc span      33515 days (91.76 yr)      first obs. used      1929-09-10      last obs. used      2021-06-14      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .43377      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 11:59:39   Additional Information  Earth MOID = .587508 au   Jupiter MOID = 2.56749 au   T_jup = 3.587  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.00   n/a MPCxxxxx   rotation period rot_per 4.6584 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 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 Bull. 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 Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1929 RO = 1939 TJ = 1962 MB  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-26 14:45 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin