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8781 Yurka (1976 GA2)
Classification: Main-belt Asteroid          SPK-ID: 2008781
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1701571717234702 3.6978e-08  
a 2.3646364554962 6.9669e-09 au
q 1.962276604074755 8.6881e-08 au
i 2.233608531467616 3.8407e-06 deg
node 159.0004131851344 8.4372e-05 deg
peri 30.80144084794159 8.4806e-05 deg
M 57.40660419510851 8.8831e-06 deg
tp 2458788.710534230159
(2019-Nov-01.21053423)
3.2481e-05 TDB
period 1328.14349056444
3.64
5.8697e-06
1.607e-08
d
yr
n .2710550498177012 1.1979e-09 deg/d
Q 2.766996306917645 8.1524e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1770  
   data-arc span      16208 days (44.38 yr)  
   first obs. used      1976-04-01  
   last obs. used      2020-08-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50939  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:18:28  

Additional Information
 Earth MOID = .963175 au 
 Jupiter MOID = 2.18796 au 
 T_jup = 3.528 
[ 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 14.6   n/a MPO384835  
diameter diameter 3.088 km 0.540 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.879 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.322   0.114 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

8781 Yurka           Discovered 1976 Apr. 1 by N. S. Chernykh at the Crimean Astrophysical Observatory.
Yuri Sergeevich Efimov (b. 1935) is an astrophysicist who has worked at the Crimean Astrophysical Observatory since 1958. He is a prominent expert in stellar photometry and polarimetry and is well known for his research on peculiar stars and extragalactic objects.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20001013/MPCPages.arcLast Updated: 2013-03-29

[ show close-approach data ]
Alternate Designations
 1976 GA2 = 1994 CD2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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