+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 27 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3125428403028355 4.008e-08   a 2.608670686264638 1.2365e-08 au q 1.793349340564741 1.104e-07 au i 6.136890252317055 3.4109e-06 deg node 104.8000583272903 4.1076e-05 deg peri 323.4979662146665 4.172e-05 deg M 282.4363010914495 7.8891e-06 deg tp 2459332.076180856889 (2021-Apr-27.57618086) 3.5002e-05 TDB period 1538.959936003275 4.21 1.0942e-05 2.996e-08 d yr n .2339242182840255 1.6633e-09 deg/d Q 3.423992031964534 1.623e-08 au   Orbit Determination Parameters    # obs. used (total)      1655      data-arc span      30707 days (84.07 yr)      first obs. used      1936-10-21      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .47758      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 03:15:18   Additional Information  Earth MOID = .812012 au   Jupiter MOID = 1.90714 au   T_jup = 3.332  [ 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 13.7   n/a MPO449105   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-Jan-19 18:55 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin