+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100020 (1990 QH4) Classification: Main-belt Asteroid          SPK-ID: 2100020 [ 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 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1892993776981179 5.4415e-08   a 2.225297768221438 5.5293e-09 au q 1.804050285504109 1.2065e-07 au i 4.48094404580679 5.419e-06 deg node 346.689729430971 4.7608e-05 deg peri 358.5441124891373 4.8721e-05 deg M 40.83503761436125 1.0009e-05 deg tp 2459062.965679974397 (2020-Aug-01.46567997) 3.3689e-05 TDB period 1212.496867930006 3.32 4.5191e-06 1.237e-08 d yr n .2969079834528544 1.1066e-09 deg/d Q 2.646545250938767 6.576e-09 au   Orbit Determination Parameters    # obs. used (total)      1088      data-arc span      11106 days (30.41 yr)      first obs. used      1990-08-16      last obs. used      2021-01-11      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .49292      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:24:05   Additional Information  Earth MOID = .794911 au   Jupiter MOID = 2.76055 au   T_jup = 3.619  [ 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 16.12   n/a E2021B55   diameter diameter 3.577 km 0.025 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.077   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   100020 (1990 QH4)          Discovered 1990-Aug-23 by Holt, H. E. at Palomar Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  1990 QH4 = 2000 QG28  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-09 05:50 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin