+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2364 Seillier (1978 GD) Classification: Main-belt Asteroid          SPK-ID: 2002364 [ 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 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1404183390951078 4.125e-08   a 3.172488570380805 1.9156e-08 au q 2.72701299452972 1.3132e-07 au i 10.70973892929067 4.4192e-06 deg node 42.79956370350197 2.2767e-05 deg peri 167.8844721060165 2.7089e-05 deg M 158.5238055741103 1.6453e-05 deg tp 2458091.653550604563 (2017-Dec-04.15355060) 9.1597e-05 TDB period 2063.946929594733 5.65 1.8693e-05 5.118e-08 d yr n .1744230894883949 1.5798e-09 deg/d Q 3.617964146231891 2.1846e-08 au   Orbit Determination Parameters    # obs. used (total)      2312      data-arc span      24966 days (68.35 yr)      first obs. used      1951-09-01      last obs. used      2020-01-08      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44756      source      ORB      producer      Otto Matic      solution date      2020-Jan-28 18:32:50   Additional Information  Earth MOID = 1.72213 au   Jupiter MOID = 1.34971 au   T_jup = 3.159  [ 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 11.3   n/a MPO319112   diameter diameter 19.629 km 0.165 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 12.284 h n/a LCDB (Rev. 2019-August); 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: [Casalnuovo, G.B. (2015) Minor Planet Bull. 42, 139-141.] geometric albedo albedo 0.103   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   2364 Seillier (1978 GD)          Discovered 1978-Apr-14 by Debehogne, H. at La Silla Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1978 GD = 1966 DX = 1971 BH = 1978 HA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-15 18:26 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin