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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03645842597698117 4.0521e-08  
a 2.853420540504503 1.3437e-08 au
q 2.749389318947322 1.1835e-07 au
i 2.212312068742298 4.4893e-06 deg
node 166.2197856328427 0.00011386 deg
peri 133.070132705696 0.00012755 deg
M 356.6877280782545 5.7934e-05 deg
tp 2457416.698342742161
(2016-Jan-29.19834274)
0.00028334 JED
period 1760.544884281368
4.82
1.2436e-05
3.405e-08
d
yr
n .2044821482338676 1.4444e-09 deg/d
Q 2.957451762061684 1.3927e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1860  
   data-arc span      48012 days (131.45 yr)  
   first obs. used      1884-04-01  
   last obs. used      2015-09-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .55095  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Oct-05 13:02:41  

Additional Information
 Earth MOID = 1.73248 au 
 Jupiter MOID = 2.10843 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-December); 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 Bul. 35, 67-71.]
[Warner, B.D.; Durech, J.; Faurerbach, M.; Marks, S. (2008) Minor Planet Bul. 35, 167-171.]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
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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