+ 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 ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 41 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1326404570093976 1.6498e-08   a 2.579914038753662 8.4905e-09 au q 2.237713061608416 4.3102e-08 au i 15.91587278232053 9.7246e-07 deg node 123.727630141943 4.3406e-06 deg peri 265.3520791419912 1.1833e-05 deg M 297.9435083208451 1.2332e-05 deg tp 2459657.410164824547 (2022-Mar-18.91016482) 5.2554e-05 TDB period 1513.583136837037 4.14 7.4718e-06 2.046e-08 d yr n .2378462016644151 1.1741e-09 deg/d Q 2.922115015898908 9.6166e-09 au   Orbit Determination Parameters    # obs. used (total)      3119      data-arc span      32665 days (89.43 yr)      first obs. used      1932-01-19      last obs. used      2021-06-25      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .36423      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 12:06:59   Additional Information  Earth MOID = 1.30626 au   Jupiter MOID = 2.58097 au   T_jup = 3.359  [ 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 11.09   n/a MPO614063   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 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-27 23:03 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin