+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100121 (1993 OP7) Classification: Main-belt Asteroid          SPK-ID: 2100121 [ 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 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1847922293028594 4.8192e-08   a 2.663294036216939 1.7803e-08 au q 2.1711379939754 1.23e-07 au i 13.30249077526536 4.4577e-06 deg node 120.0600168587785 2.3757e-05 deg peri 173.9535362429642 2.9796e-05 deg M 111.6219940465431 2.2288e-05 deg tp 2458708.262861300861 (2019-Aug-12.76286130) 9.4852e-05 TDB period 1587.548864767642 4.35 1.5918e-05 4.358e-08 d yr n .2267646735098706 2.2737e-09 deg/d Q 3.155450078458478 2.1093e-08 au   Orbit Determination Parameters    # obs. used (total)      592      data-arc span      10045 days (27.50 yr)      first obs. used      1993-07-13      last obs. used      2021-01-12      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52551      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:24:30   Additional Information  Earth MOID = 1.15362 au   Jupiter MOID = 2.07066 au   T_jup = 3.322  [ 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 15.4   n/a MPO436466   diameter diameter 4.683 km 0.053 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.050   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   100121 (1993 OP7)          Discovered 1993-Jul-20 by Elst, E. W. at La Silla Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 Alternate Designations  1993 OP7 = 1997 JP9  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-03 03:46 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin