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863 Benkoela (A917 CG)
Classification: Outer Main-belt Asteroid          SPK-ID: 2000863
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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 49 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02850302724351426 1.0383e-08  
a 3.200520254498283 1.3341e-08 au
q 3.109295738490899 3.2806e-08 au
i 25.41669209741057 3.1861e-07 deg
node 116.9222375395491 1.563e-06 deg
peri 97.80312516032272 4.245e-05 deg
M 359.7860259157865 4.0189e-05 deg
tp 2459397.743048209627
(2021-Jul-02.24304821)
0.00023347 TDB
period 2091.362405454476
5.73
1.3076e-05
3.58e-08
d
yr
n .172136593380987 1.0763e-09 deg/d
Q 3.291744770505667 1.3721e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3405  
   data-arc span      38167 days (104.50 yr)  
   first obs. used      1917-02-09  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .36273  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 07:05:04  

Additional Information
 Earth MOID = 2.15522 au 
 Jupiter MOID = 1.91023 au 
 T_jup = 3.042 
[ 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 9.21   n/a MPO636074 IRAS observations used: 3
diameter diameter 38.724 km 0.161 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 8.20 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Garceran, A.C.; Aznar, A.; Mansego, E.A.; Rodriguez, P.B.; et al. (2016) Minor Planet Bull. 43, 92-97.]
geometric albedo albedo 0.290   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 1.077   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=9.41, mean=12.67, max.=15.66) deg.
U-B UB 0.633   0.034 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=15.47, mean=15.57, max.=15.66) deg.
Tholen spectral type spec_T A   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B A   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)

863 Benkoela (A917 CG)          Discovered 1917-Feb-09 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A917 CG = 1927 WD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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