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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2358732702074531 3.0264e-08  
a 2.794429821052954 9.5016e-09 au
q 2.135298520795966 8.6163e-08 au
i 6.841249977173151 3.6728e-06 deg
node 214.4403889860484 2.8316e-05 deg
peri 113.0118754186536 2.9278e-05 deg
M 318.594089760638 7.6137e-06 deg
tp 2459196.744761810930
(2020-Dec-13.24476181)
3.6527e-05 TDB
period 1706.232608908425
4.67
8.7023e-06
2.383e-08
d
yr
n .2109911615335454 1.0761e-09 deg/d
Q 3.453561121309942 1.1743e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2641  
   data-arc span      40984 days (112.21 yr)  
   first obs. used      1908-07-27  
   last obs. used      2020-10-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41036  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:27:06  

Additional Information
 Earth MOID = 1.13557 au 
 Jupiter MOID = 1.98316 au 
 T_jup = 3.276 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456585.5 (2013-Oct-20.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2343474427302698 3.0278e-08  
q 2.139578993044634 8.6065e-08 au
tp 2455787.736554177450
(2011-Aug-14.23655418)
3.3262e-05 TDB
node 214.4818165804588 2.8305e-05 deg
peri 113.3581732768855 2.9283e-05 deg
i 6.840984950401301 3.6728e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2641  
   data-arc span      40984 days (112.21 yr)  
   first obs. used      1908-07-27  
   last obs. used      2020-10-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41036  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:27:06  

Additional Information
 Jupiter MOID = 1.98316 au 
 T_jup = 3.276 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.16770791929547E-16 -2.596568594880658E-15 1.529292968814224E-13 -1.845471060690277E-15 4.086158377485202E-14 -1.272442596750016E-15
q -2.596568594880658E-15 7.407129662630811E-15 -4.461427222983679E-13 3.180565908184547E-15 -1.111822710636844E-13 3.935653648227082E-15
tp 1.529292968814224E-13 -4.461427222983679E-13 1.106365569440936E-9 -7.035527085978953E-12 2.586818704262057E-10 -1.940160408629363E-13
node -1.845471060690277E-15 3.180565908184547E-15 -7.035527085978953E-12 8.012012950824105E-10 -7.971885127686E-10 -1.095371226920034E-11
peri 4.086158377485202E-14 -1.111822710636844E-13 2.586818704262057E-10 -7.971885127686E-10 8.575018997372754E-10 1.093058539451777E-11
i -1.272442596750016E-15 3.935653648227082E-15 -1.940160408629363E-13 -1.095371226920034E-11 1.093058539451777E-11 1.348929937855968E-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

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