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JPL Small-Body Database Browser
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860 Ursina (A917 BE)
Classification: Main-belt Asteroid          SPK-ID: 2000860
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1064535686516366 3.8793e-08  
a 2.797366597852545 1.0388e-08 au
q 2.499576940684254 1.0873e-07 au
i 13.29653710686227 3.2421e-06 deg
node 309.352899553413 1.9413e-05 deg
peri 21.69217123123277 2.9612e-05 deg
M 98.36660211544684 2.4894e-05 deg
tp 2458133.552910077742
0.00011721 TDB
period 1708.923036446079
n .2106589895052649 1.1735e-09 deg/d
Q 3.095156255020836 1.1494e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2346  
   data-arc span      42689 days (116.88 yr)  
   first obs. used      1903-01-18  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4133  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:49:49  

Additional Information
 Earth MOID = 1.4913 au 
 Jupiter MOID = 2.22672 au 
 T_jup = 3.279 
[ 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 10.26   n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5
diameter diameter 34.561 km 0.356 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 9.386 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Blanco, C.; Di Martino, M.; Riccioli, D. (2000) Planet. Space Sci. 48, 271-284.]
[Warner, B.D. (2000) Minor Planet Bull. 27, 4-6.]
[Warner, B.D. (2011) Minor Planet Bull. 38, 21-23.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Behrend, R. (2018) Observatoire de Geneve web site,]
geometric albedo albedo 0.116   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.658   0.037 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=20.15 deg.
U-B UB 0.205   0.056 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=20.15 deg.
Tholen spectral type spec_T M   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B X   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)

860 Ursina (A917 BE)          Discovered 1917-Jan-22 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A917 BE = 1959 CU = A903 BB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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