+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   506 Marion (A903 DB) Classification: Main-belt Asteroid          SPK-ID: 2000506 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 86 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1473472329443086 3.6287e-08   a 3.039092645852455 1.157e-08 au q 2.591290753824698 1.0823e-07 au i 17.00620780640132 4.4114e-06 deg node 312.9343032944421 1.3484e-05 deg peri 145.8622142342809 2.0318e-05 deg M 78.74650802903876 1.4879e-05 deg tp 2458577.204998737521 (2019-Apr-03.70499874) 7.9316e-05 TDB period 1935.148672221733 5.30 1.1051e-05 3.026e-08 d yr n .1860322181792296 1.0623e-09 deg/d Q 3.486894537880212 1.3275e-08 au   Orbit Determination Parameters    # obs. used (total)      2725      data-arc span      41619 days (113.95 yr)      first obs. used      1906-09-17      last obs. used      2020-08-28      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .39193      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:28:52   Additional Information  Earth MOID = 1.62437 au   Jupiter MOID = 1.67641 au   T_jup = 3.158  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 8.9   n/a MPO502157 IRAS observations used: 17 diameter diameter 105.94 km 2.6 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17 rotation period rot_per 13.546 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Behrend, R. (2001) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Warner, B.D. (2009) Minor Planet Bull. 36, 109-116.] [Warner, B.D. (2010) Minor Planet Bull. 37, 127-130.] [Saylor, D.A.; Leake, M. (2012) J. Southeastern Assoc. for Research in Astron. 5, 25-28.] [Wang, X.; Muinonen, K.; Wang, Y. (2015) Planet. Space Sci. 118, 242-249.] geometric albedo albedo 0.0454   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17 B-V BV 0.718   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=14.62, mean=15.90, max.=18.33) deg. U-B UB 0.332   0.028 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=14.62, mean=15.90, max.=18.33) deg. Tholen spectral type spec_T XC   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices 506 Marion (A903 DB)          Discovered 1903-Feb-17 by Dugan, R. S. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A903 DB = 1948 PF1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-16 10:04 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin