+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   149 Medusa (A875 SA) Classification: Main-belt Asteroid          SPK-ID: 2000149 [ 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 45 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .06492265828910579 3.0333e-08   a 2.174483561540381 4.9536e-09 au q 2.033310308319217 6.6668e-08 au i .939500647675748 4.2958e-06 deg node 159.6023654141553 0.00019704 deg peri 251.2995862579517 0.00020003 deg M 350.2194411994453 3.4728e-05 deg tp 2459032.319532002242 (2020-Jul-01.81953200) 0.000113 TDB period 1171.204197469531 3.21 4.0021e-06 1.096e-08 d yr n .3073759475741337 1.0503e-09 deg/d Q 2.315656814761545 5.2752e-09 au   Orbit Determination Parameters    # obs. used (total)      3199      data-arc span      47165 days (129.13 yr)      first obs. used      1891-09-28      last obs. used      2020-11-15      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43192      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:51:21   Additional Information  Earth MOID = 1.04375 au   Jupiter MOID = 2.86995 au   T_jup = 3.683  [ 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 10.5   n/a MPO492750   diameter diameter 23.719 km 0.267 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 26.023 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Harris, A.W.; Young, J.W.; Dockweiler, T.; Gibson, J.; et al. (1992) Icarus 95, 115-147.] [Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Pilcher, F. (2011) Minor Planet Bull. 38, 76-78.] [Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.] geometric albedo albedo 0.152   0.030 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.803   0.016 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=1.43, mean=1.96, max.=2.50) deg. U-B UB 0.500   0.033 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=1.43, mean=1.96, max.=2.50) deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices 149 Medusa (A875 SA)          Discovered 1875-Sep-21 by Perrotin, J. at Toulouse Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A875 SA = A905 BA = A906 HB  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-22 04:52 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin