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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.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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