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167 Urda
Classification: Main-belt Asteroid          SPK-ID: 2000167
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03621781038840904 4.0596e-08  
a 2.852593189968267 1.355e-08 AU
q 2.749278510698729 1.1842e-07 AU
i 2.212276277816476 4.5071e-06 deg
node 166.2262527109287 0.00011416 deg
peri 133.3418902426599 0.00012807 deg
M 274.5931015440335 5.84e-05 deg
tp 2457417.992461980606
(2016-Jan-30.49246198)
0.000286 JED
period 1759.779233647119
4.82
1.2538e-05
3.433e-08
d
yr
n .204571115010776 1.4576e-09 deg/d
Q 2.955907869237805 1.4041e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1817  
   data-arc span      47927 days (131.22 yr)  
   first obs. used      1884-04-01  
   last obs. used      2015-06-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .55328  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 11:33:43  

Additional Information
 Earth MOID = 1.73537 AU 
 T_jup = 3.303 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.1 mag n/a MPO259333  
diameter diameter 39.94 km 1.9 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5
rotation period rot_per 13.07 h n/a LCDB (Rev. 2015-July); Warner et al., 2009 Published Reference List:
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D. (2008) Minor Planet Bul. 35, 67-71.]
geometric albedo albedo 0.2230   0.023 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5
B-V BV .837 mag .038 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=3; phase (min.=4.74, mean=12.85, max.=18.02) deg.
U-B UB .400 mag .040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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          Discovered 1876-Aug-28 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A899 KC = A905 QA = A906 WA 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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