+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   19702 (1999 SK23) Classification: Main-belt Asteroid          SPK-ID: 2019702 [ 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 .1558912977338101 3.6605e-08   a 3.074339824522001 1.816e-08 au q 2.595076999602533 1.1839e-07 au i 7.088438781087886 3.578e-06 deg node 56.74570285716424 3.3418e-05 deg peri 336.9939404209775 3.6016e-05 deg M 318.0045034430656 1.5385e-05 deg tp 2459430.181731327967 (2021-Aug-03.68173133) 8.5236e-05 TDB period 1968.911670468506 5.39 1.7445e-05 4.776e-08 d yr n .1828421281663374 1.6201e-09 deg/d Q 3.55360264944147 2.0991e-08 au   Orbit Determination Parameters    # obs. used (total)      1633      data-arc span      25206 days (69.01 yr)      first obs. used      1951-12-01      last obs. used      2020-12-04      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .47989      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:03:13   Additional Information  Earth MOID = 1.60254 au   Jupiter MOID = 1.87844 au   T_jup = 3.199  [ 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 13.29   n/a E2021B10   diameter diameter 11.979 km 0.090 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.061   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   19702 (1999 SK23)          Discovered 1999-Sep-30 by LINEAR at Socorro Reference: 20001211/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1999 SK23 = 1951 XM1 = 1978 WH16 = 1999 RD221  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-18 16:20 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin