+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15503 (1999 RD25) Classification: Main-belt Asteroid          SPK-ID: 2015503 [ 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 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .060636750728495 2.9269e-08   a 2.648285143309796 1.0963e-08 au q 2.487701737216944 7.7715e-08 au i 3.551411467011925 3.6364e-06 deg node 226.0367696352439 5.9062e-05 deg peri 36.07131205584135 6.9138e-05 deg M 68.31061155818858 3.4652e-05 deg tp 2458901.802755806790 (2020-Feb-22.30275581) 0.000152 TDB period 1574.147931876706 4.31 9.7744e-06 2.676e-08 d yr n .2286951516499509 1.42e-09 deg/d Q 2.80886854940265 1.1627e-08 au   Orbit Determination Parameters    # obs. used (total)      1783      data-arc span      15378 days (42.10 yr)      first obs. used      1978-11-30      last obs. used      2021-01-06      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .47642      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 01:00:10   Additional Information  Earth MOID = 1.4716 au   Jupiter MOID = 2.21669 au   T_jup = 3.386  [ 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 14.15   n/a E2021B10   diameter diameter 9.634 km 0.089 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.050   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   15503 (1999 RD25)          Discovered 1999-Sep-07 by LINEAR at Socorro Reference: 20000621/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1999 RD25 = 1978 WU18 = 1989 GV = 1998 KJ38  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-16 03:50 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin