+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100012 (1989 BC1) Classification: Main-belt Asteroid          SPK-ID: 2100012 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 26 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2796947582282906 4.5963e-08   a 2.671971077943592 1.4335e-08 au q 1.924634773305174 1.2472e-07 au i 27.76930035501353 5.0037e-06 deg node 119.1094916665368 1.0835e-05 deg peri 288.5453584933057 1.3608e-05 deg M 155.4517167946686 9.7989e-06 deg tp 2458511.627134750372 (2019-Jan-28.12713475) 4.0407e-05 TDB period 1595.313558469309 4.37 1.2838e-05 3.515e-08 d yr n .2256609668292528 1.816e-09 deg/d Q 3.41930738258201 1.8345e-08 au   Orbit Determination Parameters    # obs. used (total)      2031      data-arc span      11481 days (31.43 yr)      first obs. used      1989-01-04      last obs. used      2020-06-11      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .34919      source      ORB      producer      Otto Matic      solution date      2020-Jun-24 01:11:54   Additional Information  Earth MOID = 1.08906 au   Jupiter MOID = 2.30406 au   T_jup = 3.165  [ 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 14.29   n/a E2021B55   diameter diameter 6.154 km 1.186 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   geometric albedo albedo 0.032   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   100012 (1989 BC1)          Discovered 1989-Jan-25 by Mrkos, A. at Klet Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  1989 BC1 = 1989 AC3 = 2001 VR98  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-09 05:19 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin