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247 Eukrate (A885 EB)
Classification: Main-belt Asteroid          SPK-ID: 2000247
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 81 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2452304796390372 4.6458e-08  
a 2.741242274506554 7.5949e-09 au
q 2.069006116722506 1.2807e-07 au
i 24.95110851442553 6.7497e-06 deg
node .05680330867920617 1.0513e-05 deg
peri 55.38107356376688 1.6067e-05 deg
M 19.40871638714709 1.0954e-05 deg
tp 2458911.125449393292
5.0355e-05 TDB
period 1657.751990220317
n .2171615549996448 9.0251e-10 deg/d
Q 3.413478432290601 9.4575e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1885  
   data-arc span      49268 days (134.89 yr)  
   first obs. used      1885-03-16  
   last obs. used      2020-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4958  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:22:00  

Additional Information
 Earth MOID = 1.15536 au 
 Jupiter MOID = 2.34748 au 
 T_jup = 3.174 
[ 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 8.2   n/a MPO492751 IRAS observations used: 17
diameter diameter 130.935 km 0.505 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 12.093 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Schober, H.J.; Surdej, J. (1979) Astron. Astrophys. Suppl. Ser. 38, 269-274.]
[Harris, A.W.; Young, J.W. (1980) Icarus 43, 20-32.]
[Pilcher, F.; Delos, S.; Ahrendts, G.; Barker, T. (2012) Minor Planet Bull. 39, 204.]
[Garlitz, J. (2013) Posting on CALL web site.]
[Behrend, R. (2015) Observatoire de Geneve web site,]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.064   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.691   0.014 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=6; phase (min.=6.51, mean=10.88, max.=18.92) deg.
U-B UB 0.295   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=6.51, mean=10.01, max.=18.92) deg.
Tholen spectral type spec_T CP   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Xc   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)

247 Eukrate (A885 EB)          Discovered 1885-Mar-14 by Luther, R. at Dusseldorf
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A885 EB = 1947 TA = 1960 TC = A901 TB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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