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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03827645862204656 1.6175e-08  
a 2.856161697342827 8.2801e-09 au
q 2.74683794231661 4.8747e-08 au
i 2.213785649048582 3.4755e-07 deg
node 166.1255166955962 2.4888e-05 deg
peri 130.9970275197597 4.1596e-05 deg
M 6.829326290688338 2.9912e-05 deg
tp 2459167.053708148512
(2020-Nov-13.55370815)
0.00014653 TDB
period 1763.082411650612
4.83
7.6669e-06
2.099e-08
d
yr
n .2041878460252831 8.8793e-10 deg/d
Q 2.965485452369044 8.5971e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3232  
   data-arc span      49918 days (136.67 yr)  
   first obs. used      1884-03-29  
   last obs. used      2020-11-29  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44169  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 10:24:54  

Additional Information
 Earth MOID = 1.72966 au 
 Jupiter MOID = 2.10225 au 
 T_jup = 3.301 
[ 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 9.22   n/a E2021B10  
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. 2020-October); 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.]
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
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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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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