+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   440 Theodora (A898 TB) Classification: Main-belt Asteroid          SPK-ID: 2000440 [ 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 44 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1079617369605862 3.0732e-08   a 2.210265123751051 4.6235e-09 au q 1.971641061847483 6.8035e-08 au i 1.597294513336249 3.3921e-06 deg node 292.0576141116601 0.00011906 deg peri 179.4346958900371 0.00012006 deg M 344.1850226903549 1.5484e-05 deg tp 2459253.226756404179 (2021-Feb-07.72675640) 5.164e-05 TDB period 1200.231396723421 3.29 3.766e-06 1.031e-08 d yr n .2999421619720866 9.4115e-10 deg/d Q 2.44888918565462 5.1227e-09 au   Orbit Determination Parameters    # obs. used (total)      3257      data-arc span      44659 days (122.27 yr)      first obs. used      1898-10-15      last obs. used      2021-01-22      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .38684      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:46:39   Additional Information  Earth MOID = .98814 au   Jupiter MOID = 2.62936 au   T_jup = 3.650  [ 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 11.59   n/a E2021B10   diameter diameter 13.600 km 0.540 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 4.828 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Florczak, M.; Dotto, E.; Barucci, M.A.; Birlan, M.; et al. (1997) Planet. Space Sci. 45, 1423-1435.] [Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.] [Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.630   0.306 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   440 Theodora (A898 TB)          Discovered 1898-Oct-13 by Coddington, E. F. at Mount Hamilton Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Feb-25 08:43 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin