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167 Urda (A876 QA)
Classification: Main-belt Asteroid          SPK-ID: 2000167
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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03780602981527746 3.6735e-08  
a 2.854407885535573 8.9715e-09 au
q 2.746494055910052 1.0662e-07 au
i 2.21239323866729 3.7346e-06 deg
node 166.1890776603709 0.00010358 deg
peri 131.9739588613668 0.00011466 deg
M 324.9937879761802 4.9262e-05 deg
tp 2459171.783328418671
(2020-Nov-18.28332842)
0.00024109 TDB
period 1761.458743058633
4.82
8.3045e-06
2.274e-08
d
yr
n .2043760612723115 9.6354e-10 deg/d
Q 2.962321715161094 9.3107e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3183  
   data-arc span      49881 days (136.57 yr)  
   first obs. used      1884-03-29  
   last obs. used      2020-10-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44297  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:32:38  

Additional Information
 Earth MOID = 1.73135 au 
 Jupiter MOID = 2.1073 au 
 T_jup = 3.302 
[ 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 9.2   n/a MPO384743  
diameter diameter 39.935 km 0.264 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 13.07 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Slivan, S.M.; Binzel, R.P. (1996) Icarus 124, 452-470.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D. (2008) Minor Planet Bull. 35, 67-71.]
[Warner, B.D.; Durech, J.; Faurerbach, M.; Marks, S. (2008) Minor Planet Bull. 35, 167-171.]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
geometric albedo albedo 0.223   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.837   0.038 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=4.74, mean=12.85, max.=18.02) deg.
U-B UB 0.400   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=4.74, mean=12.85, max.=18.02) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 4 color indices
SMASSII spectral type spec_B Sk   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)

167 Urda (A876 QA)          Discovered 1876-Aug-28 by Peters, C. H. F. at Clinton
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
2199-Jun-01 03:29 < 00:01 Psych 0.0194758194409087 0.0194652056532558 0.0194864394051917 2.51492327359511 2.51492302657478 2524379.644874001 0.477469073521386 760.715451724099 38.0458740024027 -46.0788039291903 55096.1465516434 T 37 CATAB v2.0f-lin.ifort 2020-Nov-13 04:32:47 2020-Nov-13 04:32

Alternate Designations
 A876 QA = A899 KC = A905 QA = A906 WA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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