+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15285 (1991 RW18) Classification: Main-belt Asteroid          SPK-ID: 2015285 [ 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 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1156733232069094 4.9551e-08   a 3.06140105477017 1.8653e-08 au q 2.707278621095767 1.5022e-07 au i 4.859251533390021 4.1229e-06 deg node 268.0940146664331 5.7922e-05 deg peri 98.57676914982353 6.0531e-05 deg M 116.1349347405766 1.8176e-05 deg tp 2458369.340464947614 (2018-Sep-07.84046495) 9.7965e-05 TDB period 1956.495116016723 5.36 1.7881e-05 4.896e-08 d yr n .1840025037900084 1.6816e-09 deg/d Q 3.415523488444574 2.081e-08 au   Orbit Determination Parameters    # obs. used (total)      1498      data-arc span      10630 days (29.10 yr)      first obs. used      1991-09-14      last obs. used      2020-10-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4778      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 02:34:37   Additional Information  Earth MOID = 1.71146 au   Jupiter MOID = 2.09259 au   T_jup = 3.218  [ 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 13.8   n/a MPO458967   diameter diameter 10.295 km 0.326 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.080   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   15285 (1991 RW18)          Discovered 1991-Sep-14 by Holt, H. E. at Palomar Reference: 20000621/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1991 RW18 = 1997 WL33 = 1999 CN66  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-24 13:47 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin