+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1400396784978208 4.9955e-08   a 2.995066742813932 1.4615e-08 au q 2.575638559070753 1.5179e-07 au i 3.147162695893123 4.6589e-06 deg node 43.18566893707096 8.1187e-05 deg peri 332.511165915336 8.2152e-05 deg M 206.1451212716434 1.3628e-05 deg tp 2460009.627488086753 (2023-Mar-06.12748809) 7.4381e-05 TDB period 1893.250952577982 5.18 1.3858e-05 3.794e-08 d yr n .1901491186415615 1.3918e-09 deg/d Q 3.41449492655711 1.6662e-08 au   Orbit Determination Parameters    # obs. used (total)      1627      data-arc span      21784 days (59.64 yr)      first obs. used      1960-09-24      last obs. used      2020-05-16      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .49581      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 01:05:02   Additional Information  Earth MOID = 1.57606 au   Jupiter MOID = 2.04891 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 ] 2021-Apr-16 02:32 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin