+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   728 Leonisis (A912 DB) Classification: Main-belt Asteroid          SPK-ID: 2000728 [ 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 41 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08802730190994065 2.9378e-08   a 2.253745702534279 5.5669e-09 au q 2.055354549149063 6.5797e-08 au i 4.257149477885484 3.1763e-06 deg node 82.64193985188417 4.7809e-05 deg peri 54.97496578202144 5.1895e-05 deg M 5.740142761283956 2.0074e-05 deg tp 2458980.795020505806 (2020-May-11.29502051) 6.8904e-05 TDB period 1235.821635962808 3.38 4.5789e-06 1.254e-08 d yr n .2913041732915851 1.0793e-09 deg/d Q 2.452136855919496 6.057e-09 au   Orbit Determination Parameters    # obs. used (total)      2742      data-arc span      39516 days (108.19 yr)      first obs. used      1912-02-17      last obs. used      2020-04-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43402      source      ORB      producer      Otto Matic      solution date      2020-May-20 01:11:42   Additional Information  Earth MOID = 1.07254 au   Jupiter MOID = 2.561 au   T_jup = 3.616  [ 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 12.9   n/a MPO502160   diameter diameter 5.887 km 0.481 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 5.5783 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Galad, A. (2010) Astron. Astrophys. 514, A55.] [Pilcher, F. (2010) Minor Planet Bull. 37, 119-122.] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] [Mas, V.; Fornas, G.; Lozano, J.; Rodrigo, O.; et al. (2018) Minor Planet Bull. 45, 76-82.] geometric albedo albedo 0.160   0.053 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   728 Leonisis (A912 DB)          Discovered 1912-Feb-16 by Palisa, J. at Vienna Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A912 DB = 1941 WR = 1968 UT = A907 UE  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Aug-07 02:29 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin