+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1078564641786736 3.1858e-08   a 2.209860453260705 5.2567e-09 au q 1.971512718443724 6.9969e-08 au i 1.597320169621084 3.4884e-06 deg node 292.0556944323369 0.0001283 deg peri 179.5058369180597 0.00012942 deg M 284.1185666415442 1.8033e-05 deg tp 2459253.417410723708 (2021-Feb-07.91741072) 6.0392e-05 TDB period 1199.901791923501 3.29 4.2814e-06 1.172e-08 d yr n .300024554028628 1.0705e-09 deg/d Q 2.448208188077686 5.8237e-09 au   Orbit Determination Parameters    # obs. used (total)      2935      data-arc span      44277 days (121.22 yr)      first obs. used      1898-10-15      last obs. used      2020-01-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .39968      source      ORB      producer      Otto Matic      solution date      2020-Feb-22 15:27:29   Additional Information  Earth MOID = .988124 au   Jupiter MOID = 2.63036 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 11.5   n/a MPO435699   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. 2019-August); 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 ] 2020-Jul-14 06:55 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin