+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   120810 (1998 HA12) Classification: Main-belt Asteroid          SPK-ID: 2120810 [ 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 21 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08258279839869048 4.2927e-08   a 2.630824911784746 1.2307e-08 au q 2.413564028472574 1.1136e-07 au i 2.513531305761204 4.5501e-06 deg node 331.748804913295 9.3403e-05 deg peri 229.6243923319849 9.6632e-05 deg M 74.55247930918502 2.4398e-05 deg tp 2458677.727938947495 (2019-Jul-13.22793895) 0.00010526 TDB period 1558.606005536102 4.27 1.0937e-05 2.994e-08 d yr n .2309756274012132 1.6208e-09 deg/d Q 2.848085795096919 1.3324e-08 au   Orbit Determination Parameters    # obs. used (total)      833      data-arc span      9075 days (24.85 yr)      first obs. used      1995-09-24      last obs. used      2020-07-29      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53226      source      ORB      producer      Otto Matic      solution date      2020-Aug-25 10:11:00   Additional Information  Earth MOID = 1.41146 au   Jupiter MOID = 2.11757 au   T_jup = 3.394  [ 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 15.4   n/a MPO475061   diameter diameter 2.606 km 0.861 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.237   0.134 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   120810 (1998 HA12)          Discovered 1998-Apr-19 by Spacewatch at Kitt Peak Reference: 20060314/Numbers.arc Last Updated: 2006-03-23 [ show close-approach data ] Alternate Designations  1998 HA12 = 2000 WM9  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Nov-01 02:34 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin