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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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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2358732644901331 3.1196e-08  
a 2.794429818798352 9.9841e-09 au
q 2.135298535049813 8.8194e-08 au
i 6.841248895886184 3.8418e-06 deg
node 214.4403935483039 2.8665e-05 deg
peri 113.011869823718 2.9647e-05 deg
M 318.594091777616 8.1182e-06 deg
tp 2459196.744752013890
(2020-Dec-13.24475201)
3.9003e-05 TDB
period 1706.23260684349
4.67
9.1442e-06
2.504e-08
d
yr
n .2109911617888933 1.1308e-09 deg/d
Q 3.45356110254689 1.2339e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2476  
   data-arc span      40868 days (111.89 yr)  
   first obs. used      1908-07-27  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42144  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:18:40  

Additional Information
 Earth MOID = 1.13557 au 
 Jupiter MOID = 1.98316 au 
 T_jup = 3.276 
[ show covariance matrix ]

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

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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