+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15815 (1994 PY18) Classification: Main-belt Asteroid          SPK-ID: 2015815 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 32 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2750908056406883 1.675e-08   a 2.336881508842859 7.2742e-09 au q 1.694026891888449 3.8153e-08 au i 11.18197648557155 3.0964e-07 deg node 331.0653630443655 5.0209e-06 deg peri 10.17841098655338 6.4105e-06 deg M 129.2991393237436 3.3903e-06 deg tp 2458731.852183080297 (2019-Sep-05.35218308) 1.2012e-05 TDB period 1304.828593395838 3.57 6.0925e-06 1.668e-08 d yr n .2758983071202433 1.2882e-09 deg/d Q 2.979736125797268 9.2753e-09 au   Orbit Determination Parameters    # obs. used (total)      1695      data-arc span      12225 days (33.47 yr)      first obs. used      1987-09-25      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .45672      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 01:09:57   Additional Information  Earth MOID = .68456 au   Jupiter MOID = 2.42964 au   T_jup = 3.491  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.40   n/a E2021B10   diameter diameter 4.752 km 0.245 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.103   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   15815 (1994 PY18)          Discovered 1994-Aug-12 by Elst, E. W. at La Silla Reference: 20000726/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1994 PY18 = 1987 ST16 = 1994 RU24 = 2000 EJ86  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-22 16:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin