+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 27 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2750349471585553 4.5385e-08   a 2.336633156709041 8.4683e-09 au q 1.693977379924642 1.0763e-07 au i 11.18137022194611 4.647e-06 deg node 331.0683739893748 1.5753e-05 deg peri 10.15092275516463 1.7307e-05 deg M 74.15354935118522 5.0121e-06 deg tp 2458731.771534667983 (2019-Sep-05.27153467) 1.8478e-05 TDB period 1304.620592891148 3.57 7.0922e-06 1.942e-08 d yr n .275942294611654 1.5001e-09 deg/d Q 2.979288933493441 1.0797e-08 au   Orbit Determination Parameters    # obs. used (total)      1445      data-arc span      11821 days (32.36 yr)      first obs. used      1987-09-25      last obs. used      2020-02-05      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46904      source      ORB      producer      Otto Matic      solution date      2020-Feb-22 21:28:38   Additional Information  Earth MOID = .686353 au   Jupiter MOID = 2.4295 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 14.3   n/a MPO395156   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 ] 2020-Oct-21 01:09 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin