+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   12444 Prothoon (1996 GE19) Classification: Jupiter Trojan          SPK-ID: 2012444 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07266418113233439 4.7542e-08   a 5.240356913953859 8.0452e-08 au q 4.859570669960235 2.9661e-07 au i 30.83648785271238 5.4686e-06 deg node 213.2216198364337 7.0863e-06 deg peri 65.34921459892287 4.0397e-05 deg M 321.9854745679054 4.2393e-05 deg tp 2459663.186470212981 (2022-Mar-24.68647021) 0.00051925 TDB period 4381.670621515775 12.00 0.0001009 2.762e-07 d yr n .08216044314975535 1.892e-09 deg/d Q 5.621143157947484 8.6298e-08 au   Orbit Determination Parameters    # obs. used (total)      2156      data-arc span      9064 days (24.82 yr)      first obs. used      1996-03-24      last obs. used      2021-01-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4511      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 19:10:22   Additional Information  Earth MOID = 3.94645 au   Jupiter MOID = .395252 au   T_jup = 2.712  [ 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 9.97   n/a E2021B10   diameter diameter 63.835 km 0.844 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   rotation period rot_per 15.82 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [French, L.M.; Stephens, R.D.; Coley, D.R.; Megna, R.; Wasserman, L.H. (2012) Minor Planet Bull. 39, 183-187.] [Stephens, R.D.; Warner, B.D. (2020) Minor Planet Bull. 47, 285-289.] geometric albedo albedo 0.052   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   12444 Prothoon           Discovered 1996 Apr. 15 by E. W. Elst at the European Southern Observatory. Prothoon was a Trojan warrior who was killed by Teucer. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20030106/MPCPages.arc Last Updated: 2003-10-02 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-09 04:41 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin