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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 
[ 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

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1920-Mar-12 19:28 00:02 Jupiter 1.97715165577671 1.97715130989386 1.97715200165945 1.40635769331353 1.05878755701013 2422396.311389763 1.51399832158648 111.949621339204 64.0101299615123 -47.3279814376613 3239193.60901298 T 35 CATAB v2.0f-lin.ifort 2020-Aug-24 22:20:10 2020-Aug-24 22:20
1943-Apr-15 17:33 00:01 Jupiter 1.98747835346053 1.98747800916512 1.98747869775616 1.77763803320659 1.51909117314513 2430830.231464581 1.11801833709456 91.8410127810423 36.3784392936497 -57.7319734628253 2807341.62809903 T 35 CATAB v2.0f-lin.ifort 2020-Aug-24 22:20:10 2020-Aug-24 22:20
2074-Sep-07 01:34 < 00:01 Jupiter 1.99289553305371 1.99289519158076 1.99289587452644 1.46765046265628 1.14190884787442 2478822.565345613 0.983301369862658 83.5761611834958 69.5751496602812 -21.153616899199 2440168.37346947 T 35 CATAB v2.0f-lin.ifort 2020-Aug-24 22:20:10 2020-Aug-24 22:20
2097-Oct-10 04:19 00:01 Jupiter 1.98740837402488 1.9874080294133 1.98740871863691 1.56620310800065 1.26514946863234 2487256.679638727 1.38689535248176 114.339553290225 42.5457726856994 -49.5023140936937 3460595.11763298 T 35 CATAB v2.0f-lin.ifort 2020-Aug-24 22:20:10 2020-Aug-24 22:20
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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