+ 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 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 42 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07264709482979918 1.9989e-08   a 5.239520573417368 6.912e-08 au q 4.858884625457633 1.5396e-07 au i 30.83900547808534 1.2482e-06 deg node 213.2244977315204 2.0323e-06 deg peri 65.55698361415888 1.5538e-05 deg M 337.9042070532969 1.7308e-05 deg tp 2459665.370306771070 (2022-Mar-26.87030677) 0.00021119 TDB period 4380.621717041742 11.99 8.6683e-05 2.373e-07 d yr n .08218011580399824 1.6262e-09 deg/d Q 5.620156521377104 7.4141e-08 au   Orbit Determination Parameters    # obs. used (total)      2431      data-arc span      9226 days (25.26 yr)      first obs. used      1996-03-24      last obs. used      2021-06-27      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .43703      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 02:59:55   Additional Information  Earth MOID = 3.94795 au   Jupiter MOID = .395877 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 9.98   n/a MPCxxxxx   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-Jul-29 21:35 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin