+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   5145 Pholus (1992 AD) Classification: Centaur          SPK-ID: 2005145 [ 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 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5692573039301972 6.3621e-07   a 20.37593913319939 4.7301e-05 au q 8.776786957188506 8.8632e-06 au i 24.61270269838907 1.3258e-05 deg node 119.445311194686 2.9692e-05 deg peri 354.9191486915832 0.00012926 deg M 112.7149033393026 0.00041837 deg tp 2448482.002186876673 (1991-Aug-13.50218688) 0.0024714 TDB period 33595.01805476 91.98 0.11698 0.0003203 d yr n .0107158745803678 3.7314e-08 deg/d Q 31.97509130921028 7.4227e-05 au   Orbit Determination Parameters    # obs. used (total)      392      data-arc span      14881 days (40.74 yr)      first obs. used      1977-07-22      last obs. used      2018-04-19      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      1      norm. resid. RMS      .54502      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 03:45:49   Additional Information  Earth MOID = 7.79392 au   Jupiter MOID = 3.51717 au   T_jup = 3.214  [ 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 7.1   n/a MPO169571   diameter diameter 190 km 26 Earth, Moon, and Planets, v. 89, Issue 1, p. 117-134 (2002)   rotation period rot_per 9.980 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Buie, M.W.; Bus, S.J. (1992) Icarus 100, 288-294.] [Hoffmann, M.; Fink, U.; Grundy, W.M. (1992) in Observations and Physical Properties of Small Solar System Bodies. A. Brahic, J.-C. Gerard, J. Surdej, eds. Universite de Liege, Institut d'Astrophysique, Liege, pp. 203-208.] [Farnham, T.L. (2001) Icarus 152, 238-245.] [Tegler, S.C.; Romanishin, W.; Consolmagno, G.J.; Rall, J.; et al. (2005) Icarus 175, 390-396.] geometric albedo albedo 0.044   0.013 Earth, Moon, and Planets, v. 89, Issue 1, p. 117-134 (2002)   Tholen spectral type spec_T Z   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 3 color indices 5145 Pholus (1992 AD)          Discovered 1992-Jan-09 by Spacewatch at Kitt Peak Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-28 13:49 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin