+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 51 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1231069349523144 2.3428e-08   a 3.113283205895763 1.3948e-08 au q 2.730016452779421 7.6169e-08 au i 9.613886177342733 1.7689e-07 deg node 129.3374033949649 1.7948e-06 deg peri 59.30395133166841 4.765e-06 deg M 270.0716215946236 4.1166e-06 deg tp 2459701.711043772571 (2022-May-02.21104377) 2.4307e-05 TDB period 2006.440891714533 5.49 1.3484e-05 3.692e-08 d yr n .1794221805818434 1.2058e-09 deg/d Q 3.496549959012106 1.5665e-08 au   Orbit Determination Parameters    # obs. used (total)      3062      data-arc span      30016 days (82.18 yr)      first obs. used      1939-01-18      last obs. used      2021-03-24      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .42087      source      ORB      producer      Otto Matic      solution date      2021-May-03 20:31:45   Additional Information  Earth MOID = 1.74702 au   Jupiter MOID = 1.53485 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 11.04   n/a MPCxxxxx   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-May-11 14:52 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin