+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21794 (1999 SK8) Classification: Main-belt Asteroid          SPK-ID: 2021794 [ 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 30 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1367920084502921 4.741e-08   a 2.573040667610235 1.1202e-08 au q 2.221069266863551 1.2761e-07 au i 14.01996109830968 7.0052e-06 deg node 40.55313136734964 1.2056e-05 deg peri 44.46833498028684 2.7598e-05 deg M 323.5364590502862 2.4409e-05 deg tp 2459353.194973916318 (2021-May-18.69497392) 0.00010256 TDB period 1507.538466592775 4.13 9.8445e-06 2.695e-08 d yr n .2387998767379017 1.5594e-09 deg/d Q 2.92501206835692 1.2734e-08 au   Orbit Determination Parameters    # obs. used (total)      1941      data-arc span      15092 days (41.32 yr)      first obs. used      1979-11-14      last obs. used      2021-03-10      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .44258      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:53:30   Additional Information  Earth MOID = 1.2562 au   Jupiter MOID = 2.43774 au   T_jup = 3.374  [ 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 13.96   n/a E2021B10   diameter diameter 4.859 km 0.300 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.226   0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21794 (1999 SK8)          Discovered 1999-Sep-29 by LINEAR at Socorro Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1999 SK8 = 1979 VS1 = 1983 VJ  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-20 11:38 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin