+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   103 Hera (A868 RA) Classification: Main-belt Asteroid          SPK-ID: 2000103 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 116 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07922951093182569 3.5424e-08   a 2.702717682317449 7.114e-09 au q 2.48858268216064 9.5341e-08 au i 5.418467247542871 3.9944e-06 deg node 136.0771220161525 4.0372e-05 deg peri 188.8406349403369 4.7511e-05 deg M 127.9077572259329 2.5937e-05 deg tp 2458623.874512839306 (2019-May-20.37451284) 0.00011653 TDB period 1622.928740836077 4.44 6.4077e-06 1.754e-08 d yr n .2218211995029064 8.758e-10 deg/d Q 2.916852682474258 7.6776e-09 au   Orbit Determination Parameters    # obs. used (total)      2779      data-arc span      54704 days (149.77 yr)      first obs. used      1871-04-04      last obs. used      2021-01-11      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50076      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:43:26   Additional Information  Earth MOID = 1.47452 au   Jupiter MOID = 2.3312 au   T_jup = 3.356  [ 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 7.63   n/a E2021B10 IRAS observations used: 25 diameter diameter 83.908 km 2.091 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 23.740 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Harris, A.W.; Young, J.W. (1983) Icarus 54, 59-109.] [Pilcher, F.; Higgins, D. (2011) Minor Planet Bull. 38, 32.] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] geometric albedo albedo 0.217   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.853   0.012 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=3.66, mean=7.54, max.=19.73) deg. U-B UB 0.441   0.015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=8; phase (min.=3.66, mean=9.26, max.=21.25) deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo 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) 103 Hera (A868 RA)          Discovered 1868-Sep-07 by Watson, J. C. at Ann Arbor Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A868 RA = 1927 CV = 1950 CM  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-02 17:47 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin