+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   29 Amphitrite Classification: Main-belt Asteroid          SPK-ID: 2000029 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 137 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07255206687933323 3.2467e-08   a 2.554143911643757 3.8739e-09 AU q 2.368835491746737 8.2988e-08 AU i 6.090244158401686 3.2559e-06 deg node 356.4381884530559 3.3837e-05 deg peri 61.77495686314018 4.3517e-05 deg M 114.8632437547762 2.631e-05 deg tp 2455924.786968736840 (2011-Dec-29.28696874) 0.00010881 JED period 1490.961648448279 4.08 3.392e-06 9.287e-09 d yr n .2414549028639809 5.4932e-10 deg/d Q 2.739452331540777 4.1549e-09 AU   Orbit Determination Parameters    # obs. used (total)      1846      data-arc span      57607 days (157.72 yr)      first obs. used      1855-07-25      last obs. used      2013-04-14      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .66694      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 12:31:33   Additional Information  Earth MOID = 1.3866 AU   T_jup = 3.427  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 5.85 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 11 magnitude slope G 0.20   n/a PDS3 (MPC 17257) Fit diameter diameter 212.22 km 6.8 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 11 rotation period rot_per 5.3921 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List: [Chang, Y.C.; Chang, C.-s. (1963) Acta Astron. Sin. 11, 139-149.] [Debehogne, H.; Surdej, A.; Surdej, J. (1978) Astron. Astrophys. Suppl. Ser. 32, 127-133.] [Van Houten-Groeneveld, I.; van Houten, C.J.; Zappala, V. (1979) Astron. Astrophys. Suppl. Ser. 35, 223-232.] [Tedesco, E.F.; Sather, R.E. (1981) Astron. J. 86, 1553-1558.] [Magnusson, P. (1986) Icarus 68, 1-39.] [Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R.; Greenberg, R.; et al. (1987) Icarus 70, 191-245.] [Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1988) Icarus 76, 19-77.] [Magnusson, P. (1990) Icarus 85, 229-240.] [Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1991) Icarus 89, 44-64.] [De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.] [Kaasalainen, M.; Torppa, J.; Piironen, J. (2002) Icarus 159, 369-395.] [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Hamanowa, H.; Hamanowa, H. (2011) http://www2.ocn.ne.jp/~hamaten/astlcdata.htm] [Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.1793   0.012 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 11 B-V BV .838 mag .020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=60; phase (min.=.46, mean=10.77, max.=24.12) deg. U-B UB .449 mag .049 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=46; phase (min.=.46, mean=8.83, max.=23.91) deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 29 Amphitrite          Discovered 1854-Mar-01 by Marth, A. at London Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A899 NG  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-Jun-19 10:36 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin