+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   13 Egeria (A850 VA) Classification: Main-belt Asteroid          SPK-ID: 2000013 [ 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 99 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08537031021984334 3.232e-08   a 2.576616260875998 3.2911e-09 au q 2.356649731367522 8.3182e-08 au i 16.53380927921495 3.7357e-06 deg node 43.21908128194797 1.2548e-05 deg peri 80.29318617775182 2.5466e-05 deg M 330.7918450527204 2.1733e-05 deg tp 2459323.067312871314 (2021-Apr-18.56731287) 9.1223e-05 TDB period 1510.681955546899 4.14 2.8944e-06 7.924e-09 d yr n .2383029721631065 4.5657e-10 deg/d Q 2.796582790384475 3.572e-09 au   Orbit Determination Parameters    # obs. used (total)      2910      data-arc span      62206 days (170.31 yr)      first obs. used      1850-11-21      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .5409      source      ORB      producer      Otto Matic      solution date      2021-May-03 17:43:21   Additional Information  Earth MOID = 1.43572 au   Jupiter MOID = 2.35562 au   T_jup = 3.364  [ 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 6.83   n/a E2021B10 IRAS observations used: 3 diameter diameter 202.636 km 50.084 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   rotation period rot_per 7.045 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Chang, Y.C.; Chang, C.-s. (1963) Acta Astron. Sin. 11, 139-149.] [Lagerkvist, C.I.; Magnusson, P.; Williams, I.P.; Buontempo, M.E.; et al. (1988) Astron. Astrophys. Suppl. Ser. 73, 395-405.] [Piironen, J.; Lagerkvist, C.-I.; Erikson, A.; Oja, T.; et al. (1998) Astron. Astrophys. Suppl. Ser. 128, 525-540.] [Riccioli, D.; Blanco, C.; Cigna, M. (2001) Planet. Space Sci. 49, 657-671.] [Pilcher, F. (2009) Minor Planet Bull. 36, 133-136.] [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.] [Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.] geometric albedo albedo 0.049   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)   B-V BV 0.745   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=8; phase (min.=9.59, mean=18.30, max.=24.72) deg. U-B UB 0.452   0.034 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=8; phase (min.=9.59, mean=18.30, max.=24.72) deg. Tholen spectral type spec_T G   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 4 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B Ch   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) 13 Egeria (A850 VA)          Discovered 1850-Nov-02 by De Gasparis, A. at Naples Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jun-19 17:10 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin