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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .235873268939876 3.0521e-08  
a 2.794429820467255 9.659e-09 au
q 2.135298523890573 8.6709e-08 au
i 6.841249737394048 3.7414e-06 deg
node 214.4403895511725 2.837e-05 deg
peri 113.0118745404077 2.9345e-05 deg
M 318.5940903130403 7.7907e-06 deg
tp 2459196.744759131101
(2020-Dec-13.24475913)
3.7395e-05 TDB
period 1706.232608371997
4.67
8.8465e-06
2.422e-08
d
yr
n .2109911615998795 1.0939e-09 deg/d
Q 3.453561117043936 1.1937e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2554  
   data-arc span      40915 days (112.02 yr)  
   first obs. used      1908-07-27  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41589  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:19:58  

Additional Information
 Earth MOID = 1.13557 au 
 Jupiter MOID = 1.98316 au 
 T_jup = 3.276 
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Orbital Elements at Epoch 2456536.5 (2013-Sep-01.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2341971337853002 3.0547e-08  
q 2.140275514167629 8.6673e-08 au
tp 2455787.652059385599
(2011-Aug-14.15205939)
3.3644e-05 TDB
node 214.4902640700633 2.8359e-05 deg
peri 113.361716568183 2.935e-05 deg
i 6.840761258759984 3.7412e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2554  
   data-arc span      40915 days (112.02 yr)  
   first obs. used      1908-07-27  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41589  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:19:58  

Additional Information
 Jupiter MOID = 1.98316 au 
 T_jup = 3.276 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.331196934408653E-16 -2.637845777164479E-15 1.728714450891891E-13 -2.259327592362232E-15 4.522298685670168E-14 -1.228918621436917E-15
q -2.637845777164479E-15 7.512152753673111E-15 -4.968621438698484E-13 4.349306824914383E-15 -1.225129901764566E-13 3.745982392893135E-15
tp 1.728714450891891E-13 -4.968621438698484E-13 1.131913325475194E-9 -7.114801595610484E-12 2.637444088806914E-10 -3.208212689519314E-13
node -2.259327592362232E-15 4.349306824914383E-15 -7.114801595610484E-12 8.042090501661818E-10 -8.00189631360796E-10 -1.213824947635578E-11
peri 4.522298685670168E-14 -1.225129901764566E-13 2.637444088806914E-10 -8.00189631360796E-10 8.614325700336824E-10 1.20763817927018E-11
i -1.228918621436917E-15 3.745982392893135E-15 -3.208212689519314E-13 -1.213824947635578E-11 1.20763817927018E-11 1.399650615364413E-11

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 12.0   n/a MPO435701  
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. 2019-August); Warner et al., 2009 Published Reference List:
[Pilcher, F.; Durkee, R.I.; Martinez, L. (2011) Minor Planet Bull. 39, 11.]
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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