+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100040 (1991 RQ17) Classification: Main-belt Asteroid          SPK-ID: 2100040 [ 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 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3687554438327896 5.3072e-08   a 3.166306934010837 2.7473e-08 au q 1.998714015248832 1.7527e-07 au i 22.58173583942454 7.8138e-06 deg node 349.5071719098506 1.4237e-05 deg peri 75.43410487544753 1.747e-05 deg M 344.5596214274574 1.0375e-05 deg tp 2459088.763955949625 (2020-Aug-27.26395595) 6.0175e-05 TDB period 2057.91742686737 5.63 2.6783e-05 7.333e-08 d yr n .1749341325847092 2.2767e-09 deg/d Q 4.333899852772842 3.7603e-08 au   Orbit Determination Parameters    # obs. used (total)      607      data-arc span      10279 days (28.14 yr)      first obs. used      1991-09-11      last obs. used      2019-11-02      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50867      source      ORB      producer      Otto Matic      solution date      2019-Dec-04 09:29:57   Additional Information  Earth MOID = 1.13357 au   Jupiter MOID = 1.9849 au   T_jup = 2.982  [ 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 13.9   n/a MPO320180   diameter diameter 9.388 km 0.157 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.066   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   100040 (1991 RQ17)          Discovered 1991-Sep-11 by Holt, H. E. at Palomar Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  1991 RQ17 = 2003 XK10  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-23 22:44 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin