+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1848815983228634 5.9552e-08   a 2.662790347241281 1.9583e-08 au q 2.170489411844621 1.5656e-07 au i 13.30253659886142 7.3348e-06 deg node 120.0599565105458 3.1904e-05 deg peri 173.8947912811222 3.8857e-05 deg M 66.31544778391675 2.4714e-05 deg tp 2458708.141251934043 (2019-Aug-12.64125193) 0.00010733 TDB period 1587.098524112961 4.35 1.7508e-05 4.793e-08 d yr n .2268290181929355 2.5022e-09 deg/d Q 3.155091282637942 2.3203e-08 au   Orbit Determination Parameters    # obs. used (total)      472      data-arc span      9018 days (24.69 yr)      first obs. used      1993-07-13      last obs. used      2018-03-22      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55585      source      ORB      producer      Otto Matic      solution date      2018-Oct-04 03:56:20   Additional Information  Earth MOID = 1.15495 au   Jupiter MOID = 2.07136 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 ] 2020-Oct-24 04:45 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin