+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15647 (4556 P-L) Classification: Main-belt Asteroid          SPK-ID: 2015647 [ 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 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .139811405192903 5.0338e-08   a 2.995650260664263 1.4755e-08 au q 2.576824188254307 1.5309e-07 au i 3.146837269014273 4.7036e-06 deg node 43.18823102625453 8.1996e-05 deg peri 332.5245945974384 8.2977e-05 deg M 168.097148712827 1.3617e-05 deg tp 2458116.213620280799 (2017-Dec-28.71362028) 6.9298e-05 TDB period 1893.804262217214 5.18 1.3991e-05 3.831e-08 d yr n .1900935630900534 1.4044e-09 deg/d Q 3.414476333074221 1.6817e-08 au   Orbit Determination Parameters    # obs. used (total)      1594      data-arc span      21766 days (59.59 yr)      first obs. used      1960-09-24      last obs. used      2020-04-28      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4992      source      ORB      producer      Otto Matic      solution date      2020-May-20 04:13:34   Additional Information  Earth MOID = 1.57866 au   Jupiter MOID = 2.04777 au   T_jup = 3.237  [ 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 13.7   n/a MPO337391   diameter diameter 4.807 km 1.352 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.366   0.139 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   15647 (4556 P-L)          Discovered 1960-Sep-24 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar Reference: 20000621/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  4556 P-L = 1991 RT21  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-23 21:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin