+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15747 (1991 RW23) Classification: Main-belt Asteroid          SPK-ID: 2015747 [ 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 30 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07970266437116881 3.2499e-08   a 2.792421330970569 1.1893e-08 au q 2.56985791084533 9.3066e-08 au i 4.007679917078847 3.7366e-06 deg node 198.7233645253539 4.8664e-05 deg peri 187.2340143267618 5.3586e-05 deg M 21.12162367289734 2.2326e-05 deg tp 2458900.501232595256 (2020-Feb-21.00123260) 0.00010561 TDB period 1704.393413272551 4.67 1.0888e-05 2.981e-08 d yr n .2112188402023776 1.3494e-09 deg/d Q 3.014984751095809 1.2841e-08 au   Orbit Determination Parameters    # obs. used (total)      1919      data-arc span      16389 days (44.87 yr)      first obs. used      1975-03-15      last obs. used      2020-01-27      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51252      source      ORB      producer      Otto Matic      solution date      2020-Feb-22 21:26:49   Additional Information  Earth MOID = 1.57374 au   Jupiter MOID = 2.37212 au   T_jup = 3.320  [ 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 13.6   n/a MPO502290   diameter diameter 12.276 km 0.143 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.046   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   15747 (1991 RW23)          Discovered 1991-Sep-11 by Holt, H. E. at Palomar Reference: 20000726/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1991 RW23 = 1975 EA4 = 1991 PB21 = 1999 JP23 = 1999 KF16  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-28 00:02 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin