+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   249809 (2001 CL31) Classification: Outer Main-belt Asteroid          SPK-ID: 2249809 [ 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 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1000968974406877 5.7274e-08   a 3.234740867406982 4.4164e-08 au q 2.910953342554945 1.8347e-07 au i 14.13167067812597 8.1468e-06 deg node 318.1674546633092 2.4838e-05 deg peri 83.09863196387886 4.7099e-05 deg M 201.5769172287468 3.997e-05 deg tp 2459935.633529901178 (2022-Dec-22.13352990) 0.00024067 TDB period 2124.99381324696 5.82 4.3519e-05 1.191e-07 d yr n .1694122579349656 3.4695e-09 deg/d Q 3.55852839225902 4.8584e-08 au   Orbit Determination Parameters    # obs. used (total)      292      data-arc span      7112 days (19.47 yr)      first obs. used      1999-12-12      last obs. used      2019-06-02      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .61688      source      ORB      producer      Otto Matic      solution date      2019-Sep-24 04:19:09   Additional Information  Earth MOID = 1.9621 au   Jupiter MOID = 1.8695 au   T_jup = 3.130  [ 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 15.1   n/a MPO437160   diameter diameter 5.283 km 0.486 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.076   0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   249809 (2001 CL31)          Discovered 2001-Feb-12 by Comba, P. G. at Prescott Reference: 20100923/Numbers.arc Last Updated: 2010-09-27 [ show close-approach data ] Alternate Designations  2001 CL31 = 2004 PX94  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-13 04:06 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin