+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   20960 (1971 UR) Classification: Main-belt Asteroid          SPK-ID: 2020960 [ 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 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .0911290811486169 3.1634e-08   a 3.164105214953447 1.7583e-08 au q 2.875763214057192 9.9132e-08 au i 5.871417012889578 4.149e-06 deg node 46.07068128025722 3.4951e-05 deg peri 61.45392294723268 4.2032e-05 deg M 186.6789087158026 2.4517e-05 deg tp 2459990.245909873032 (2023-Feb-14.74590987) 0.0001421 TDB period 2055.771313890742 5.63 1.7136e-05 4.692e-08 d yr n .1751167542651745 1.4597e-09 deg/d Q 3.452447215849702 1.9186e-08 au   Orbit Determination Parameters    # obs. used (total)      1947      data-arc span      17889 days (48.98 yr)      first obs. used      1971-10-26      last obs. used      2020-10-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46784      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 01:59:42   Additional Information  Earth MOID = 1.89855 au   Jupiter MOID = 1.6843 au   T_jup = 3.189  [ 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 13.0   n/a MPO266065   diameter diameter 13.005 km 0.280 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.055   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   20960 (1971 UR)          Discovered 1971-Oct-26 by Kohoutek, L. at Bergedorf Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1971 UR = 1982 UW4 = 1993 TF48  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Nov-29 08:38 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin