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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1713080743257304 3.6783e-08  
a 2.363749276571004 7.1247e-09 au
q 1.958819939812787 8.6632e-08 au
i 2.236636721296685 3.8228e-06 deg
node 158.9660802561706 8.3962e-05 deg
peri 30.82819538540223 8.4386e-05 deg
M 164.6658567485237 8.9741e-06 deg
tp 2458789.342173497203
(2019-Nov-01.84217350)
3.2165e-05 TDB
period 1327.396109047764
3.63
6.0015e-06
1.643e-08
d
yr
n .2712076655537687 1.2262e-09 deg/d
Q 2.768678613329221 8.3452e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1801  
   data-arc span      16564 days (45.35 yr)  
   first obs. used      1976-04-01  
   last obs. used      2021-08-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50765  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 19:44:24  

Additional Information
 Earth MOID = .960499 au 
 Jupiter MOID = 2.18428 au 
 T_jup = 3.528 
[ 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 14.59   n/a E2021B10  
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

Alternate Designations
 1976 GA2 = 1994 CD2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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