+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   233527 (2007 HU31) Classification: Main-belt Asteroid          SPK-ID: 2233527 [ 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 14 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .04682942513955277 5.5576e-08   a 2.784556001977681 2.8595e-08 au q 2.654156845136175 1.4755e-07 au i 3.36128240871 5.3751e-06 deg node 258.9709623135278 0.00011226 deg peri 43.44460397646717 0.0001542 deg M 215.9956851144251 0.00011228 deg tp 2459679.399308691659 (2022-Apr-09.89930869) 0.00053482 TDB period 1697.197416085756 4.65 2.6143e-05 7.158e-08 d yr n .2121143931683961 3.2674e-09 deg/d Q 2.914955158819188 2.9934e-08 au   Orbit Determination Parameters    # obs. used (total)      189      data-arc span      9277 days (25.40 yr)      first obs. used      1994-09-08      last obs. used      2020-02-01      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .58597      source      ORB      producer      Otto Matic      solution date      2020-Feb-25 07:21:00   Additional Information  Earth MOID = 1.63985 au   Jupiter MOID = 2.18905 au   T_jup = 3.328  [ 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 16.6   n/a MPO470486   diameter diameter 3.333 km 0.551 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.033   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   233527 (2007 HU31)          Discovered 2007-Apr-19 by Spacewatch at Kitt Peak Reference: 20100228/Numbers.arc Last Updated: 2010-03-03 [ show close-approach data ] Alternate Designations  2007 HU31 = 2004 TH231  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-26 02:13 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin