+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21271 (1996 RF33) Classification: Jupiter Trojan          SPK-ID: 2021271 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .00731111848259164 4.2003e-08   a 5.145397914338154 8.798e-08 au q 5.107779300546347 2.767e-07 au i 6.689673476422842 3.8929e-06 deg node 112.7654425699946 4.7825e-05 deg peri 351.5998035099646 0.00041398 deg M 299.7678343936778 0.00041305 deg tp 2460109.768185945152 (2023-Jun-14.26818595) 0.0048961 TDB period 4263.113310893519 11.67 0.00010934 2.994e-07 d yr n .0844453275684916 2.1659e-09 deg/d Q 5.18301652812996 8.8623e-08 au   Orbit Determination Parameters    # obs. used (total)      1184      data-arc span      14937 days (40.90 yr)      first obs. used      1980-03-21      last obs. used      2021-02-11      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .51458      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 18:32:19   Additional Information  Earth MOID = 4.12499 au   Jupiter MOID = .0371518 au   T_jup = 2.987  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 11.87   n/a E2021B10   diameter diameter 21.115 km 0.817 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   geometric albedo albedo 0.091   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   21271 (1996 RF33)          Discovered 1996-Sep-15 by Uppsala-DLR Trojan Survey at La Silla Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1996 RF33 = 1997 TC28  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-27 03:36 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin