+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   109498 (2001 QR231) Classification: Main-belt Asteroid          SPK-ID: 2109498 [ 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 21 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1960404689541497 3.0918e-08   a 3.064332960367298 1.6292e-08 au q 2.463599689785235 9.3326e-08 au i 15.8678165826868 5.5863e-06 deg node 191.630564631113 1.2973e-05 deg peri 275.0949528561583 2.1258e-05 deg M 65.24847351714016 1.4451e-05 deg tp 2458645.384024064647 (2019-Jun-10.88402406) 7.8843e-05 TDB period 1959.306393629946 5.36 1.5626e-05 4.278e-08 d yr n .1837384909121024 1.4653e-09 deg/d Q 3.665066230949361 1.9486e-08 au   Orbit Determination Parameters    # obs. used (total)      1260      data-arc span      7685 days (21.04 yr)      first obs. used      1999-05-12      last obs. used      2020-05-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4969      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 19:11:41   Additional Information  Earth MOID = 1.54071 au   Jupiter MOID = 1.77781 au   T_jup = 3.146  [ 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 14.1   n/a MPO469120   diameter diameter 7.747 km 0.229 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.047   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   109498 (2001 QR231)          Discovered 2001-Aug-24 by LONEOS at Anderson Mesa Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  2001 QR231 = 2002 XV84  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Dec-02 11:26 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin