+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   4057 Demophon (1985 TQ) Classification: Jupiter Trojan          SPK-ID: 2004057 [ 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 32 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1195260005487942 4.0519e-08   a 5.257345257560551 8.2153e-08 au q 4.628955805420168 2.5903e-07 au i 2.871263648553801 5.0586e-06 deg node 24.30249335278062 9.7555e-05 deg peri 59.01378843248848 0.00010147 deg M 262.9975483164435 3.0974e-05 deg tp 2460186.892479702132 (2023-Aug-30.39247970) 0.00039472 TDB period 4402.994824152141 12.05 0.0001032 2.825e-07 d yr n .08176253081771977 1.9165e-09 deg/d Q 5.885734709700933 9.1973e-08 au   Orbit Determination Parameters    # obs. used (total)      2090      data-arc span      12837 days (35.15 yr)      first obs. used      1985-09-22      last obs. used      2020-11-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .48743      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:15:25   Additional Information  Earth MOID = 3.64614 au   Jupiter MOID = .0695798 au   T_jup = 2.983  [ 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 10.1   n/a MPO416754   diameter diameter 45.683 km 6.581 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   rotation period rot_per 29.82 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Mottola, S.; Di Martino, M.; Erikson, A.; Gonano-Beurer, M.; et al. (2011) Astron. J. 141, A170.] [Ryan, E.L.; Sharkey, B.N.L.; Woodward, C.E. (2017) Astron. J. 153, A116.] [Szabo, Gy.M.; Pal, A.; Kiss, Cs.; Kiss, L.L.; et al. (2017) Astron. Astrophys. 599, A44.] geometric albedo albedo 0.077   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   4057 Demophon (1985 TQ)          Discovered 1985-Oct-15 by Bowell, E. at Flagstaff Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-17 22:46 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin