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694 Ekard (A909 VC)
Classification: Main-belt Asteroid          SPK-ID: 2000694
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3224979801409341 3.1353e-08  
a 2.671602004490357 6.7513e-09 au
q 1.810015754301746 8.2522e-08 au
i 15.88762877253709 3.6266e-06 deg
node 229.9935779819067 1.3158e-05 deg
peri 111.7896761237224 1.41e-05 deg
M 156.5245519360879 5.7757e-06 deg
tp 2458307.016653412440
(2018-Jul-07.51665341)
2.4567e-05 TDB
period 1594.983034185335
4.37
6.046e-06
1.655e-08
d
yr
n .2257077299783794 8.5557e-10 deg/d
Q 3.533188254678968 8.9286e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2866  
   data-arc span      40396 days (110.60 yr)  
   first obs. used      1909-11-09  
   last obs. used      2020-06-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41286  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:19:11  

Additional Information
 Earth MOID = .870995 au 
 Jupiter MOID = 2.23694 au 
 T_jup = 3.252 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.2   n/a MPO502159 IRAS observations used: 24
diameter diameter 121.891 km 0.721 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 5.925 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Zeigler, K.W.; Tomlinson, D. (1984) Minor Planet Bull. 11, 21-22.]
[Zeigler, K.W.; Florence, W.B. (1985) Icarus 62, 512-517.]
[Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R.; Greenberg, R.; et al. (1987) Icarus 70, 191-245.]
[Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1988) Icarus 76, 19-77.]
[Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1991) Icarus 89, 44-64.]
[Michalowski, T. (1993) Icarus 106, 563-572.]
[De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.]
[Hainaut-Rouelle, M.-C.; Hainaut, O.R.; Detal, A. (1995) Astron. Astrophys. Suppl. Ser. 112, 125-142.]
[Chiorny, V.G.; Shevchenko, V.G.; Krugly, Yu.N.; Velichko, F.P.; Gaftonyuk, N.M. (2003) Abstracts of Photometry and Polarimetry of Asteroids: Impact on Collaboration, Kharkiv, 9-10.]
[Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.]
[Chiorny, V.G.; Shevchenko, V.G.; Krugly, Yu.N.; Velichko, F.P.; Gaftonyuk, N.M. (2007) Planet. Space Sci. 55, 986-997.]
[Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Alton, K.B. (2019) Minor Planet Bull. 46, 114-117.]
geometric albedo albedo 0.026   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.712   0.009 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=7.91, mean=12.19, max.=20.28) deg.
U-B UB 0.347   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=9.12 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

694 Ekard (A909 VC)          Discovered 1909-Nov-07 by Metcalf, J. H. at Taunton
Independent discovery Nov. 9 by J. Helffrich, Heidelberg, was announced first.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A909 VC = 1951 CD1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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