+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 37 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .117440460678588 1.9695e-08   a 3.950983953508368 3.0344e-08 au q 3.486978577874636 8.6597e-08 au i 7.98062565727935 1.1772e-06 deg node 1.486231130823529 8.9625e-06 deg peri 215.3838248771982 1.3685e-05 deg M 355.2952796904746 1.0194e-05 deg tp 2459237.987599809975 (2021-Jan-23.48759981) 8.1424e-05 TDB period 2868.509718689772 7.85 3.3046e-05 9.048e-08 d yr n .1255007077906762 1.4458e-09 deg/d Q 4.414989329142099 3.3908e-08 au   Orbit Determination Parameters    # obs. used (total)      2372      data-arc span      11667 days (31.94 yr)      first obs. used      1989-04-06      last obs. used      2021-03-16      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .45888      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 01:00:11   Additional Information  Earth MOID = 2.48381 au   Jupiter MOID = .633227 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 11.58   n/a E2021B10   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-Apr-16 01:40 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin