+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08324477036356133 4.2815e-08   a 2.629721566746303 1.2519e-08 au q 2.410810998802402 1.1126e-07 au i 2.514856734658504 4.5485e-06 deg node 331.7327486915456 9.2995e-05 deg peri 229.4015939110593 9.6182e-05 deg M 120.9359859669851 2.4262e-05 deg tp 2458677.241697570349 (2019-Jul-12.74169757) 0.00010431 TDB period 1557.625609684938 4.26 1.1123e-05 3.045e-08 d yr n .2311210073599248 1.6504e-09 deg/d Q 2.848632134690204 1.3561e-08 au   Orbit Determination Parameters    # obs. used (total)      841      data-arc span      9173 days (25.11 yr)      first obs. used      1995-09-24      last obs. used      2020-11-04      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53406      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 04:40:18   Additional Information  Earth MOID = 1.40796 au   Jupiter MOID = 2.11585 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 15.36   n/a E2021B55   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 ] 2021-Mar-05 13:09 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin