+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   146291 (2001 HT12) Classification: Main-belt Asteroid          SPK-ID: 2146291 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .146430339172046 4.6717e-08   a 2.228907355678238 1.0559e-08 au q 1.902527695603206 1.0568e-07 au i 1.990830423430122 4.3543e-06 deg node 115.1347451017969 0.00014597 deg peri 62.49540310340991 0.00014712 deg M 297.0701776118167 2.2895e-05 deg tp 2459212.966497327260 (2020-Dec-29.46649733) 7.8425e-05 TDB period 1215.448195070327 3.33 8.6372e-06 2.365e-08 d yr n .2961870373909026 2.1048e-09 deg/d Q 2.555287015753271 1.2106e-08 au   Orbit Determination Parameters    # obs. used (total)      498      data-arc span      6859 days (18.78 yr)      first obs. used      2001-04-16      last obs. used      2020-01-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54968      source      ORB      producer      Otto Matic      solution date      2020-Feb-24 08:36:14   Additional Information  Earth MOID = .907436 au   Jupiter MOID = 2.40482 au   T_jup = 3.629  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.4   n/a MPO251282   146291 (2001 HT12)          Discovered 2001-Apr-18 by LINEAR at Socorro Reference: 20070106/Numbers.arc Last Updated: 2007-01-09 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Aug-04 17:07 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin