+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   731 Sorga (A912 GH) Classification: Main-belt Asteroid          SPK-ID: 2000731 [ 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 51 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1411774960403038 4.3185e-08   a 2.987302099388667 1.2681e-08 au q 2.565562269081032 1.2982e-07 au i 10.68870760439065 4.2103e-06 deg node 46.13644572842226 2.3156e-05 deg peri 288.6180646644946 2.6645e-05 deg M 201.0326476632063 1.4981e-05 deg tp 2459833.265228396963 (2022-Sep-10.76522840) 7.9812e-05 TDB period 1885.893410288105 5.16 1.2008e-05 3.288e-08 d yr n .1908909581188915 1.2155e-09 deg/d Q 3.409041929696301 1.4471e-08 au   Orbit Determination Parameters    # obs. used (total)      2992      data-arc span      38157 days (104.47 yr)      first obs. used      1916-01-30      last obs. used      2020-07-19      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .427      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:26:23   Additional Information  Earth MOID = 1.58168 au   Jupiter MOID = 2.08185 au   T_jup = 3.216  [ 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 9.7   n/a MPO502160 IRAS observations used: 10 diameter diameter 34.597 km 0.409 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 8.184 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Warner, B.D. (2005) Minor Planet Bull. 32, 90-92.] [Warner, B.D. (2009) Minor Planet Bull. 36, 109-116.] [Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] [Behrend, R. (2017) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.209   0.042 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.691   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=1.96, mean=6.80, max.=11.63) deg. U-B UB 0.312   0.028 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=1.96, mean=6.80, max.=11.63) deg. Tholen spectral type spec_T CD   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices SMASSII spectral type spec_B Xe   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) 731 Sorga (A912 GH)          Discovered 1912-Apr-15 by Massinger, A. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A912 GH = 1940 WP  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-16 09:22 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin