+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2857403665977138 2.594e-08   a 2.228866130720101 4.5153e-09 au q 1.591989105430911 5.7057e-08 au i 3.229923226796431 3.4683e-06 deg node 100.6759563943682 5.5059e-05 deg peri 248.0601551677011 5.5467e-05 deg M 101.3724394331293 7.3382e-06 deg tp 2458658.251304971436 (2019-Jun-23.75130497) 2.4344e-05 TDB period 1215.414474577766 3.33 3.6933e-06 1.011e-08 d yr n .296195254812202 9.0006e-10 deg/d Q 2.86574315600929 5.8055e-09 au   Orbit Determination Parameters    # obs. used (total)      3019      data-arc span      33305 days (91.18 yr)      first obs. used      1929-09-10      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .45445      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:58:32   Additional Information  Earth MOID = .589188 au   Jupiter MOID = 2.56666 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 12.9   n/a MPO435706   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-Jan-28 00:38 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin