+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   22203 Prothoenor (6020 P-L) Classification: Jupiter Trojan          SPK-ID: 2022203 [ 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 30 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1006995872038374 3.2328e-08   a 5.199242354865554 7.5074e-08 au q 4.675680795957885 1.627e-07 au i 1.380392332766478 5.2536e-06 deg node 189.4120435654108 0.00014437 deg peri 96.8268676766051 0.00014693 deg M 78.48728902935612 2.5614e-05 deg tp 2458256.427499048497 (2018-May-17.92749905) 0.00031257 TDB period 4330.205623682875 11.86 9.3788e-05 2.568e-07 d yr n .08313692957929722 1.8007e-09 deg/d Q 5.722803913773222 8.2634e-08 au   Orbit Determination Parameters    # obs. used (total)      1612      data-arc span      24458 days (66.96 yr)      first obs. used      1954-02-26      last obs. used      2021-02-12      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .50649      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 04:02:27   Additional Information  Earth MOID = 3.65771 au   Jupiter MOID = .136972 au   T_jup = 2.989  [ 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 11.68   n/a E2021B10   diameter diameter 24.605 km 1.229 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   geometric albedo albedo 0.073   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   22203 Prothoenor           Discovered 1960 Sept. 24 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels. Prothoenor was also a hero from Boeotia in the fight against Troy, as were Klonios and Arkesilaos. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20010705/MPCPages.arc Last Updated: 2009-05-11 Alternate Designations  6020 P-L = 1994 NL11 = 1996 TT68 = 1998 UV31  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-21 04:47 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin