+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   11898 Dedeyn (1991 GM9) Classification: Outer Main-belt Asteroid          SPK-ID: 2011898 [ 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 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1066742680173602 4.1587e-08   a 3.225540959661008 1.6819e-08 au q 2.881458738829156 1.3082e-07 au i 2.098255941849687 3.3975e-06 deg node 129.30278296 0.00012368 deg peri 51.78495062128738 0.00012491 deg M 29.54108885729267 1.6498e-05 deg tp 2458826.869399671326 (2019-Dec-09.36939967) 9.7157e-05 TDB period 2115.934738231284 5.79 1.655e-05 4.531e-08 d yr n .1701375725325654 1.3307e-09 deg/d Q 3.569623180492859 1.8613e-08 au   Orbit Determination Parameters    # obs. used (total)      1835      data-arc span      25827 days (70.71 yr)      first obs. used      1949-11-25      last obs. used      2020-08-11      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .48502      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 02:56:35   Additional Information  Earth MOID = 1.88505 au   Jupiter MOID = 1.38856 au   T_jup = 3.178  [ 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 13.2   n/a MPO452338   diameter diameter 11.369 km 0.188 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.079   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   11898 Dedeyn           Discovered 1991 Apr. 10 by E. W. Elst at the European Southern Observatory. Peter Paul De Deyn (b. 1957) is head of the Laboratory of Neurochemistry and Behavior at the Born-Bunge Foundation of the University of Antwerp. During 1985-1986 he specialized in neuropsychiatry at the Ann Arbor Medical Center. He is currently involved with studies of human ethology and animal laboratory sciences. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20010509/MPCPages.arc Last Updated: 2009-05-11 [ show close-approach data ] Alternate Designations  1991 GM9 = 1973 AW = 1991 HQ = 1993 QU7  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-25 15:03 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin