+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   344189 (2001 HJ61) Classification: Main-belt Asteroid          SPK-ID: 2344189 [ 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 8 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1656147807151107 6.4158e-08   a 2.758593050087588 2.3999e-08 au q 2.301729267015103 1.7052e-07 au i 8.918766517387759 6.2497e-06 deg node 44.3000140414531 5.5684e-05 deg peri 176.9247727842863 6.2524e-05 deg M 64.08979554973621 2.7319e-05 deg tp 2458702.568605860199 (2019-Aug-07.06860586) 0.00012709 TDB period 1673.5160561886 4.58 2.1839e-05 5.979e-08 d yr n .2151159522304751 2.8072e-09 deg/d Q 3.215456833160072 2.7974e-08 au   Orbit Determination Parameters    # obs. used (total)      231      data-arc span      7087 days (19.40 yr)      first obs. used      2001-04-24      last obs. used      2020-09-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51041      source      ORB      producer      Otto Matic      solution date      2020-Nov-11 17:03:25   Additional Information  Earth MOID = 1.29348 au   Jupiter MOID = 1.75994 au   T_jup = 3.305  [ 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 16.4   n/a MPO391763   diameter diameter 3.089 km 0.051 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.056   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   344189 (2001 HJ61)          Discovered 2001-Apr-24 by Spacewatch at Kitt Peak Reference: 20121128/Numbers.arc Last Updated: 2012-12-03 [ show close-approach data ] Alternate Designations  2001 HJ61 = 2010 EX108  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Dec-02 11:13 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin