+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2802 Weisell (1939 BU) Classification: Main-belt Asteroid          SPK-ID: 2002802 [ 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 46 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1232785326787046 3.7199e-08   a 3.112516577373141 1.6373e-08 au q 2.728810100776436 1.1681e-07 au i 9.613759340193877 3.7578e-06 deg node 129.3391436064953 2.4397e-05 deg peri 59.39893427029704 2.9155e-05 deg M 234.0912995397047 1.7831e-05 deg tp 2459701.986273595692 (2022-May-02.48627360) 0.00010231 TDB period 2005.699825121177 5.49 1.5826e-05 4.333e-08 d yr n .1794884735447639 1.4162e-09 deg/d Q 3.496223053969846 1.8391e-08 au   Orbit Determination Parameters    # obs. used (total)      2764      data-arc span      29888 days (81.83 yr)      first obs. used      1939-01-18      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42163      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:08:29   Additional Information  Earth MOID = 1.74636 au   Jupiter MOID = 1.53624 au   T_jup = 3.185  [ 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 10.9   n/a MPO279543   diameter diameter 18.813 km 0.371 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 14.683 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Brinsfield, J.W. (2011) Minor Planet Bull. 38, 154-155.] geometric albedo albedo 0.199   0.035 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   2802 Weisell (1939 BU)          Discovered 1939-Jan-19 by Vaisala, Y. at Turku Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1939 BU = 1945 GA = 1951 KZ = 1952 OT = 1962 JO = 1969 RQ = 1975 VB6 = 1977 AL = 1978 GM2 = 1983 CZ1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-22 07:49 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin