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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 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1079616697482639 1.3953e-08  
a 2.210265121154171 4.2259e-09 au
q 1.971641208088018 3.0774e-08 au
i 1.59728947342884 7.2305e-07 deg
node 292.0577456163459 1.6921e-05 deg
peri 179.4345614290631 1.5409e-05 deg
M 344.1850291298186 8.4571e-06 deg
tp 2459253.226734842237
(2021-Feb-07.72673484)
2.8253e-05 TDB
period 1200.231394608161
3.29
3.4422e-06
9.424e-09
d
yr
n .2999421625006978 8.6021e-10 deg/d
Q 2.448889034220324 4.6822e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3350  
   data-arc span      44720 days (122.44 yr)  
   first obs. used      1898-10-15  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .38628  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 18:24:11  

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 11.60   n/a MPCxxxxx  
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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