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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1078564606897833 3.1733e-08  
a 2.209860452680223 5.2326e-09 au
q 1.971512725635811 6.973e-08 au
i 1.597320175561295 3.4788e-06 deg
node 292.0556978065898 0.00012824 deg
peri 179.5058325866323 0.00012936 deg
M 284.11856820751 1.7971e-05 deg
tp 2459253.417405404595
(2021-Feb-07.91740540)		 6.0179e-05 TDB
period 1199.901791450719
3.29		 4.2617e-06
1.167e-08		 d
yr
n .3000245541468429 1.0656e-09 deg/d
Q 2.448208179724634 5.7969e-09 au
   Orbit Determination Parameters
   # obs. used (total)      2979  
   data-arc span      44486 days (121.80 yr)  
   first obs. used      1898-10-15  
   last obs. used      2020-08-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39823  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:16:09  

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