+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   249304 (2008 UD42) Classification: Main-belt Asteroid          SPK-ID: 2249304 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 13 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07248791209271792 1.3104e-07   a 3.015130661988882 5.5188e-08 au q 2.796570135614573 4.2038e-07 au i 15.21981564732833 1.1135e-05 deg node 228.5524287620772 2.9551e-05 deg peri 161.2564393095903 6.4128e-05 deg M 94.36498031026892 5.6925e-05 deg tp 2458499.236611519141 (2019-Jan-15.73661152) 0.00029706 TDB period 1912.307078958526 5.24 5.2503e-05 1.437e-07 d yr n .1882542840326993 5.1686e-09 deg/d Q 3.23369118836319 5.9188e-08 au   Orbit Determination Parameters    # obs. used (total)      149      data-arc span      5473 days (14.98 yr)      first obs. used      2003-11-16      last obs. used      2018-11-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53355      source      ORB      producer      Otto Matic      solution date      2019-Jul-14 11:21:17   Additional Information  Earth MOID = 1.80731 au   Jupiter MOID = 2.17926 au   T_jup = 3.191  [ 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 16.0   n/a MPO460090   diameter diameter 4.314 km 1.223 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.050   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   249304 (2008 UD42)          Discovered 2008-Oct-20 by Spacewatch at Kitt Peak Reference: 20100824/Numbers.arc Last Updated: 2010-08-27 [ show close-approach data ] Alternate Designations  2008 UD42 = 2003 XO27  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Jul-10 01:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin