+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2413 van de Hulst (6816 P-L) Classification: Main-belt Asteroid          SPK-ID: 2002413 [ 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 37 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1154658039221402 3.1361e-08   a 3.01455407759961 1.4681e-08 au q 2.666476167562806 9.1804e-08 au i 10.65506139567066 4.4838e-06 deg node 166.4958393786374 1.7943e-05 deg peri 252.9693278285643 2.6704e-05 deg M 92.44986913293877 1.9162e-05 deg tp 2458509.550473676372 (2019-Jan-26.05047368) 0.00010177 TDB period 1911.758568553075 5.23 1.3966e-05 3.824e-08 d yr n .1883082968329353 1.3756e-09 deg/d Q 3.362631987636415 1.6377e-08 au   Orbit Determination Parameters    # obs. used (total)      2803      data-arc span      32602 days (89.26 yr)      first obs. used      1931-03-15      last obs. used      2020-06-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4202      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:44:46   Additional Information  Earth MOID = 1.70212 au   Jupiter MOID = 2.04298 au   T_jup = 3.212  [ 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 11.4   n/a MPO502176   diameter diameter 20.829 km 0.123 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   geometric albedo albedo 0.123   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   2413 van de Hulst (6816 P-L)          Discovered 1960-Sep-24 by PLS at Palomar These planets have all been discovered as a result of the Palomar survey of faint minor planets and subsequently identified with planets observed at other oppositions. In Sept. and Oct. 1960, T. Gehrels exposed 130 plates with the 122 cm Schmidt camera at Palomar. In the following years C. J. van Houten and I. van Houten-Groeneveld measured these plates astrometrically and photometrically at Leiden. P. Herget, Cincinnati, computed the orbits of the planets found on the NORC computer, Dahlgren, Virginia, USA. Note: "planet" implies "minor planet" Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  6816 P-L = 1931 EM = 1952 DV1 = 1973 FY1 = 1978 ER4  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Oct-01 17:32 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin