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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 ]

[ hide orbit diagram ]

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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03780602980985575 3.6735e-08  
a 2.854407885523993 8.9679e-09 au
q 2.746494055914386 1.0662e-07 au
i 2.212393230474403 3.7339e-06 deg
node 166.1890774623539 0.00010357 deg
peri 131.973958837132 0.00011464 deg
M 324.9937882236316 4.924e-05 deg
tp 2459171.783327206864
(2020-Nov-18.28332721)		 0.00024098 TDB
period 1761.458743047914
4.82		 8.3012e-06
2.273e-08		 d
yr
n .2043760612735552 9.6316e-10 deg/d
Q 2.9623217151336 9.307e-09 au
   Orbit Determination Parameters
   # obs. used (total)      3187  
   data-arc span      49899 days (136.62 yr)  
   first obs. used      1884-03-29  
   last obs. used      2020-11-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44271  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:51:29  

Additional Information
 Earth MOID = 1.73135 au 
 Jupiter MOID = 2.1073 au 
 T_jup = 3.302 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455507.5 (2010-Nov-07.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03343630395050996 3.636e-08  
q 2.757059248219016 1.0468e-07 au
tp 2455631.492555401430
(2011-Mar-10.99255540)		 0.00027433 TDB
node 166.4360885990158 0.00010362 deg
peri 128.0684847426572 0.00011786 deg
i 2.211130107969654 3.7334e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      3187  
   data-arc span      49899 days (136.62 yr)  
   first obs. used      1884-03-29  
   last obs. used      2020-11-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44271  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:51:29  

Additional Information
 Jupiter MOID = 2.1073 au 
 T_jup = 3.302 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.322083945479655E-15 -3.792765600509562E-15 -6.327923775502456E-13 -1.772069482799542E-15 -1.173325905322646E-13 -4.840148354732269E-17
q -3.792765600509562E-15 1.095867937298308E-14 1.925503144443684E-12 3.804996123411702E-15 3.575671712702554E-13 2.015195323987031E-16
tp -6.327923775502456E-13 1.925503144443684E-12 7.525762012841179E-8 -1.721782831076637E-11 1.543264131600911E-8 1.079737272269969E-12
node -1.772069482799542E-15 3.804996123411702E-15 -1.721782831076637E-11 1.073623945850668E-8 -1.073124894080099E-8 -3.376558711308609E-11
peri -1.173325905322646E-13 3.575671712702554E-13 1.543264131600911E-8 -1.073124894080099E-8 1.389180555463007E-8 3.395200103612628E-11
i -4.840148354732269E-17 2.015195323987031E-16 1.079737272269969E-12 -3.376558711308609E-11 3.395200103612628E-11 1.393849975460568E-11

[ 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. 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

[ hide close-approach data ]
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 38 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:37 2020-Dec-18 01:51

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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