+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1894570281067988 5.5571e-08   a 2.22567587092356 9.4766e-09 au q 1.804005934889371 1.2434e-07 au i 4.480715033670458 6.1308e-06 deg node 346.6907953533102 5.9139e-05 deg peri 358.5201727014004 6.0836e-05 deg M 341.472999470602 1.7915e-05 deg tp 2459062.915710173563 (2020-Aug-01.41571017) 6.0627e-05 TDB period 1212.805905998036 3.32 7.7459e-06 2.121e-08 d yr n .2968323275963525 1.8958e-09 deg/d Q 2.647345806957748 1.1272e-08 au   Orbit Determination Parameters    # obs. used (total)      706      data-arc span      10942 days (29.96 yr)      first obs. used      1990-08-16      last obs. used      2020-07-31      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .57024      source      ORB      producer      Otto Matic      solution date      2020-Aug-25 09:01:48   Additional Information  Earth MOID = .796671 au   Jupiter MOID = 2.75934 au   T_jup = 3.618  [ 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 16.0   n/a MPO333615   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 ] 2020-Oct-21 03:08 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin