+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   20959 (1936 UG) Classification: Main-belt Asteroid          SPK-ID: 2020959 [ 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 .3125077047012408 3.9997e-08   a 2.607463892729658 1.2148e-08 au q 1.792611336521351 1.1016e-07 au i 6.136762197113192 3.3184e-06 deg node 104.7986635430338 4.1033e-05 deg peri 323.5791476581842 4.1676e-05 deg M 329.1647750932592 7.991e-06 deg tp 2459332.225695810853 (2021-Apr-27.72569581) 3.4642e-05 TDB period 1537.89215532981 4.21 1.0748e-05 2.943e-08 d yr n .234086635237954 1.6359e-09 deg/d Q 3.422316448937966 1.5945e-08 au   Orbit Determination Parameters    # obs. used (total)      1840      data-arc span      30794 days (84.31 yr)      first obs. used      1936-10-21      last obs. used      2021-02-11      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .47065      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:35:15   Additional Information  Earth MOID = .810747 au   Jupiter MOID = 1.90909 au   T_jup = 3.333  [ 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 13.78   n/a E2021B10   diameter diameter 5.151 km 0.375 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.242   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   20959 (1936 UG)          Discovered 1936-Oct-21 by Laugier, M. at Nice Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1936 UG = 1991 YJ = 1999 RM173  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-18 21:10 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin