+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   180171 (2003 HD31) Classification: Main-belt Asteroid          SPK-ID: 2180171 [ 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 15 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .0700423892618848 6.8587e-08   a 3.150043188925451 3.2061e-08 au q 2.929406637694986 2.0412e-07 au i 10.84758927275643 8.5247e-06 deg node 43.44997589003567 2.6412e-05 deg peri 145.6327608488874 7.1521e-05 deg M 79.68988768738275 6.2451e-05 deg tp 2458748.463084073756 (2019-Sep-21.96308407) 0.00035419 TDB period 2042.082056531912 5.59 3.1176e-05 8.536e-08 d yr n .1762906631731496 2.6914e-09 deg/d Q 3.370679740155917 3.4306e-08 au   Orbit Determination Parameters    # obs. used (total)      266      data-arc span      6747 days (18.47 yr)      first obs. used      2002-01-23      last obs. used      2020-07-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .56766      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 09:08:27   Additional Information  Earth MOID = 1.93422 au   Jupiter MOID = 1.60371 au   T_jup = 3.176  [ 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 15.44   n/a E2021B55   diameter diameter 5.542 km 0.293 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.044   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   180171 (2003 HD31)          Discovered 2003-Apr-26 by Spacewatch at Kitt Peak Reference: 20080321/Numbers.arc Last Updated: 2008-03-26 [ show close-approach data ] Alternate Designations  2003 HD31 = 2002 CP290  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-12 14:24 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin