+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09214052532565939 3.1423e-08   a 3.159634089549506 1.7713e-08 au q 2.868503744701553 9.8384e-08 au i 5.867799547107557 4.1406e-06 deg node 45.85837301906498 3.4409e-05 deg peri 62.64152839907858 4.1327e-05 deg M 220.6292413682216 2.4233e-05 deg tp 2459994.687004591717 (2023-Feb-19.18700459) 0.00013971 TDB period 2051.41540779292 5.62 1.725e-05 4.723e-08 d yr n .1754885912587141 1.4757e-09 deg/d Q 3.450764434397459 1.9345e-08 au   Orbit Determination Parameters    # obs. used (total)      1960      data-arc span      17889 days (48.98 yr)      first obs. used      1971-10-26      last obs. used      2020-10-17      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .46657      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:35:16   Additional Information  Earth MOID = 1.89126 au   Jupiter MOID = 1.68268 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 13.05   n/a E2021B10   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 ] 2021-Apr-21 11:38 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin