+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1873 Agenor (1971 FH) Classification: Jupiter Trojan          SPK-ID: 2001873 [ 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 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .0923081665102712 2.4127e-08   a 5.229203486997497 7.4662e-08 au q 4.746505300803642 1.4811e-07 au i 21.88241971996688 7.44e-07 deg node 197.919348821665 3.0873e-06 deg peri 357.8772673492223 1.1842e-05 deg M 25.77122849787344 1.2708e-05 deg tp 2458687.831333912702 (2019-Jul-23.33133391) 0.00015678 TDB period 4367.689332338798 11.96 9.3543e-05 2.561e-07 d yr n .08242344466547218 1.7653e-09 deg/d Q 5.711901673191353 8.1554e-08 au   Orbit Determination Parameters    # obs. used (total)      2401      data-arc span      8115 days (22.22 yr)      first obs. used      1998-06-19      last obs. used      2020-09-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42222      source      ORB      producer      Davide Farnocchia      solution date      2021-Feb-08 14:23:54   Additional Information  Earth MOID = 3.74527 au   Jupiter MOID = .711034 au   T_jup = 2.848  [ hide covariance matrix ] Orbital Elements at Epoch 2459258.5 (2021-Feb-13.0) TDB Reference: JPL 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09203313434165086 2.4194e-08   q 4.747486706142498 1.4795e-07 au tp 2458689.114368741988 (2019-Jul-24.61436874) 0.00015714 TDB node 197.9198819391355 3.0865e-06 deg peri 358.0152930637131 1.1882e-05 deg i 21.88278085103415 7.4374e-07 deg   Orbit Determination Parameters    # obs. used (total)      2401      data-arc span      8115 days (22.22 yr)      first obs. used      1998-06-19      last obs. used      2020-09-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42222      source      ORB      producer      Davide Farnocchia      solution date      2021-Feb-08 14:23:54   Additional Information  Jupiter MOID = .711034 au   T_jup = 2.848  Orbit Covariance (6×6)   e q tp node peri i e 5.853560448197328E-16 -3.188755403479033E-15 4.819499076144051E-13 4.306851969678148E-14 5.916327319904361E-14 9.727716276267676E-15 q -3.188755403479033E-15 2.189008105580177E-14 -6.869773913684586E-12 -2.239824086510251E-13 -8.014910984378371E-13 -5.045418664260421E-14 tp 4.819499076144051E-13 -6.869773913684586E-12 2.469182982252737E-8 2.956930796179575E-10 1.789854277545805E-9 6.834017445917618E-11 node 4.306851969678148E-14 -2.239824086510251E-13 2.956930796179575E-10 9.526400371164157E-12 1.790804958122272E-11 2.254525165827347E-12 peri 5.916327319904361E-14 -8.014910984378371E-13 1.789854277545805E-9 1.790804958122272E-11 1.411752549847152E-10 4.050496549933952E-12 i 9.727716276267676E-15 -5.045418664260421E-14 6.834017445917618E-11 2.254525165827347E-12 4.050496549933952E-12 5.531557178266131E-13 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 10.25   n/a E2021B10   diameter diameter 50.799 km 1.181 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   rotation period rot_per 20.60 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Mottola, S.; Di Martino, M.; Erikson, A.; Gonano-Beurer, M.; et al. (2011) Astron. J. 141, A170.] [Durech, J.; Hanus, J. (2018) Astron. Astrophys. 620, A91.] geometric albedo albedo 0.062   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   1873 Agenor (1971 FH)          Discovered 1971-Mar-25 by Van Houten, C. J. at Palomar Discovered by C. J. van Houten and I. van Houten-Groeneveld, Leiden, on plates exposed by T. Gehrels in a survey of faint Trojans with the 122 cm Schmidt camera at Palomar. Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-02 00:17 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin