+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   187780 (1998 SC109) Classification: Main-belt Asteroid          SPK-ID: 2187780 [ 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 12 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .26367077675844 5.2268e-08   a 2.336053971793758 1.2138e-08 au q 1.720104806501259 1.1884e-07 au i 5.11892320009283 5.9157e-06 deg node 218.3080162208392 6.9103e-05 deg peri 136.9844619615311 7.0398e-05 deg M 89.87804680042889 1.7101e-05 deg tp 2458874.907898652508 (2020-Jan-26.40789865) 6.012e-05 TDB period 1304.135555430625 3.57 1.0164e-05 2.783e-08 d yr n .2760449237818137 2.1514e-09 deg/d Q 2.952003137086257 1.5338e-08 au   Orbit Determination Parameters    # obs. used (total)      267      data-arc span      10671 days (29.22 yr)      first obs. used      1991-11-29      last obs. used      2021-02-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .56314      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 21:56:48   Additional Information  Earth MOID = .71866 au   Jupiter MOID = 2.51844 au   T_jup = 3.515  [ 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 17.2   n/a MPO475582   diameter diameter 2.403 km 0.246 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.034   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   187780 (1998 SC109)          Discovered 1998-Sep-26 by LINEAR at Socorro Reference: 20080618/Numbers.arc Last Updated: 2008-06-20 [ show close-approach data ] Alternate Designations  1998 SC109 = 2005 ND19  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-21 09:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin