+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07262321615377158 4.7674e-08   a 5.241313158591752 8.1005e-08 au q 4.860672140145736 2.978e-07 au i 30.83327814892411 5.4708e-06 deg node 213.2203884513485 7.1061e-06 deg peri 65.13203841649619 4.0532e-05 deg M 305.7507510870789 4.2459e-05 deg tp 2459660.965016627675 (2022-Mar-22.46501663) 0.00052167 TDB period 4382.870007428461 12.00 0.00010161 2.782e-07 d yr n .08213795969076003 1.9042e-09 deg/d Q 5.621954177037768 8.6888e-08 au   Orbit Determination Parameters    # obs. used (total)      2123      data-arc span      8898 days (24.36 yr)      first obs. used      1996-03-24      last obs. used      2020-08-03      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .45295      source      ORB      producer      Otto Matic      solution date      2020-Aug-25 00:33:53   Additional Information  Earth MOID = 3.94831 au   Jupiter MOID = .394264 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 9.9   n/a MPO473935   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. 2019-August); 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.] 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 ] 2020-Oct-21 01:57 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin