+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1215 Boyer (1932 BA) Classification: Main-belt Asteroid          SPK-ID: 2001215 [ 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 37 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1331550725225774 3.7237e-08   a 2.577599923587727 9.0391e-09 au q 2.234379418828213 9.7082e-08 au i 15.91755680385237 3.1522e-06 deg node 123.7287757873537 1.5316e-05 deg peri 265.7484936360087 2.0449e-05 deg M 203.3057053379562 1.6379e-05 deg tp 2459658.418919230802 (2022-Mar-19.91891923) 7.0654e-05 TDB period 1511.547127059895 4.14 7.951e-06 2.177e-08 d yr n .2381665735425893 1.2528e-09 deg/d Q 2.920820428347241 1.0243e-08 au   Orbit Determination Parameters    # obs. used (total)      2940      data-arc span      32397 days (88.70 yr)      first obs. used      1932-01-19      last obs. used      2020-09-30      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .3698      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:21:18   Additional Information  Earth MOID = 1.30405 au   Jupiter MOID = 2.58044 au   T_jup = 3.360  [ 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 11.0   n/a MPO435707   diameter diameter 13.041 km 0.106 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 11.567 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Polakis, T. (2020) Minor Planet Bull. 47, 314-321.] geometric albedo albedo 0.116   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.900   0.066 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=11.32, mean=18.04, max.=24.76) deg. U-B UB 0.459   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=24.76 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 1215 Boyer (1932 BA)          Discovered 1932-Jan-19 by Schmitt, A. at Algiers Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-15 19:13 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin