+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 32 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1176944264078942 3.7078e-08   a 3.952248776100631 3.2987e-08 au q 3.487091123376165 1.5686e-07 au i 7.97976453960626 4.568e-06 deg node 1.485015657967619 2.8246e-05 deg peri 215.316748923426 3.4229e-05 deg M 330.2649385567874 1.8937e-05 deg tp 2459237.545206125295 (2021-Jan-23.04520613) 0.00015112 TDB period 2869.887266521362 7.86 3.593e-05 9.837e-08 d yr n .1254404673659401 1.5705e-09 deg/d Q 4.417406428825097 3.6869e-08 au   Orbit Determination Parameters    # obs. used (total)      2252      data-arc span      11394 days (31.20 yr)      first obs. used      1989-04-06      last obs. used      2020-06-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46251      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 17:50:38   Additional Information  Earth MOID = 2.48493 au   Jupiter MOID = .631892 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 11.5   n/a MPO347647   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. 2019-August); 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 ] 2020-Oct-23 21:10 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin