+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   102542 (1999 UT12) Classification: Main-belt Asteroid          SPK-ID: 2102542 [ 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 21 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2104008155803865 6.5165e-08   a 2.781805552257611 1.5995e-08 au q 2.196511395276562 1.7687e-07 au i 7.334250314299741 5.5953e-06 deg node 209.2430967171525 3.8147e-05 deg peri 171.8098182026983 3.9616e-05 deg M 152.4444472392294 1.2814e-05 deg tp 2458282.874784315811 (2018-Jun-13.37478432) 5.7093e-05 TDB period 1694.683422879221 4.64 1.4616e-05 4.002e-08 d yr n .2124290561527826 1.8321e-09 deg/d Q 3.367099709238659 1.936e-08 au   Orbit Determination Parameters    # obs. used (total)      673      data-arc span      10753 days (29.44 yr)      first obs. used      1990-11-17      last obs. used      2020-04-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .48219      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 19:54:08   Additional Information  Earth MOID = 1.19984 au   Jupiter MOID = 2.095 au   T_jup = 3.288  [ 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 15.39   n/a E2021B55   diameter diameter 3.564 km 1.786 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.105   0.101 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   102542 (1999 UT12)          Discovered 1999-Oct-29 by CSS at Catalina Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-01 11:02 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin