+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15505 (1999 RF56) Classification: Outer Main-belt Asteroid          SPK-ID: 2015505 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1172340712432924 1.9692e-08   a 3.950125084688998 2.7373e-08 au q 3.487035839090651 8.6003e-08 au i 7.980950556169035 1.158e-06 deg node 1.488346755651046 8.8193e-06 deg peri 215.427255222718 1.3226e-05 deg M 19.86493422913487 9.3308e-06 deg tp 2459238.266173736962 (2021-Jan-23.76617374) 7.3751e-05 TDB period 2867.574430281634 7.85 2.9807e-05 8.161e-08 d yr n .1255416411160575 1.3049e-09 deg/d Q 4.413214330287344 3.0582e-08 au   Orbit Determination Parameters    # obs. used (total)      2498      data-arc span      11769 days (32.22 yr)      first obs. used      1989-04-06      last obs. used      2021-06-26      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .44914      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 03:51:20   Additional Information  Earth MOID = 2.48548 au   Jupiter MOID = .634035 au   T_jup = 3.031  [ 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 11.59   n/a MPO614063   diameter diameter 24.788 km 0.344 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)   rotation period rot_per 15.11 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Warner, B.D.; Stephens, R.D.; Coley, D.R. (2017) Minor Planet Bull. 44, 130-137.] geometric albedo albedo 0.079   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)   15505 (1999 RF56)          Discovered 1999-Sep-07 by LINEAR at Socorro Reference: 20000621/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1999 RF56 = 1989 GG5 = 1997 EV46  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Aug-01 16:16 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin