+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .0798943356110209 2.9861e-08   a 2.793083081393898 1.0981e-08 au q 2.56993156429955 8.4156e-08 au i 4.007332602185171 3.4611e-06 deg node 198.7166297882045 4.8323e-05 deg peri 187.3225219338661 5.3233e-05 deg M 63.26964049461625 2.2091e-05 deg tp 2458900.848073554393 (2020-Feb-21.34807355) 0.00010444 TDB period 1704.999312104478 4.67 1.0054e-05 2.753e-08 d yr n .2111437802022644 1.2451e-09 deg/d Q 3.016234598488246 1.1858e-08 au   Orbit Determination Parameters    # obs. used (total)      2138      data-arc span      16789 days (45.97 yr)      first obs. used      1975-03-15      last obs. used      2021-03-02      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .49482      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 01:07:45   Additional Information  Earth MOID = 1.57254 au   Jupiter MOID = 2.37095 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 ] 2021-Apr-16 11:39 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin