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668 Dora (A908 OH)
Classification: Main-belt Asteroid          SPK-ID: 2000668
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2353914082023558 1.5406e-08  
a 2.793117612613636 8.8718e-09 au
q 2.13564172450571 4.4582e-08 au
i 6.841612515045167 8.3363e-07 deg
node 214.3954700471099 8.616e-06 deg
peri 112.9379017816798 8.0178e-06 deg
M 42.24752354496095 4.9061e-06 deg
tp 2459196.407404453590
(2020-Dec-12.90740445)
2.2824e-05 TDB
period 1705.030930867413
4.67
8.1235e-06
2.224e-08
d
yr
n .2111398646691146 1.006e-09 deg/d
Q 3.450593500721562 1.096e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2743  
   data-arc span      41253 days (112.94 yr)  
   first obs. used      1908-07-27  
   last obs. used      2021-07-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40566  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 13:16:56  

Additional Information
 Earth MOID = 1.13518 au 
 Jupiter MOID = 1.98516 au 
 T_jup = 3.277 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456670.5 (2014-Jan-13.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2345381325199789 1.5493e-08  
q 2.138712020756089 4.4954e-08 au
tp 2457493.682769806681
(2016-Apr-15.18276981)
2.1065e-05 TDB
node 214.4715622909158 8.6138e-06 deg
peri 113.3537895044566 7.9999e-06 deg
i 6.841457979293455 8.3484e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2743  
   data-arc span      41253 days (112.94 yr)  
   first obs. used      1908-07-27  
   last obs. used      2021-07-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40566  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 13:16:56  

Additional Information
 Jupiter MOID = 1.98516 au 
 T_jup = 3.277 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.400418886602544E-16 -6.887170312084405E-16 4.408449217237599E-14 -4.382619527287831E-14 7.672304487089895E-14 -4.721482678713611E-15
q -6.887170312084405E-16 2.020841008869547E-15 -1.197333873521356E-13 1.316844357434859E-13 -2.268612301293753E-13 1.413346181084621E-14
tp 4.408449217237599E-14 -1.197333873521356E-13 4.437517012186288E-10 9.955002487582395E-11 1.078590876101376E-11 9.000113230990517E-12
node -4.382619527287831E-14 1.316844357434859E-13 9.955002487582395E-11 7.419722856196962E-11 -5.396787377410496E-11 6.295127579408471E-12
peri 7.672304487089895E-14 -2.268612301293753E-13 1.078590876101376E-11 -5.396787377410496E-11 6.399809229060504E-11 -4.54298648198031E-12
i -4.721482678713611E-15 1.413346181084621E-14 9.000113230990517E-12 6.295127579408471E-12 -4.54298648198031E-12 6.969554772627066E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.08   n/a E2021B10  
diameter diameter 21.517 km 0.105 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 22.914 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Pilcher, F.; Durkee, R.I.; Martinez, L. (2011) Minor Planet Bull. 39, 11.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.042   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
SMASSII spectral type spec_B Ch   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

668 Dora (A908 OH)          Discovered 1908-Jul-27 by Kopff, A. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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