+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 21 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .0070599889687463 4.1777e-08   a 5.143764267410067 8.8065e-08 au q 5.107449348424321 2.7497e-07 au i 6.689722982614041 3.8984e-06 deg node 112.7638428958938 4.7841e-05 deg peri 353.5374544222346 0.00043023 deg M 281.2589896853013 0.00042938 deg tp 2460132.505541805156 (2023-Jul-07.00554181) 0.0050889 TDB period 4261.083185355368 11.67 0.00010943 2.996e-07 d yr n .08448556020620765 2.1697e-09 deg/d Q 5.180079186395814 8.8686e-08 au   Orbit Determination Parameters    # obs. used (total)      1179      data-arc span      14907 days (40.81 yr)      first obs. used      1980-03-21      last obs. used      2021-01-12      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51256      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 02:51:42   Additional Information  Earth MOID = 4.12412 au   Jupiter MOID = .0350223 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-Apr-13 05:39 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin