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JPL Small-Body Database Browser
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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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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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1701571697700216 3.8338e-08  
a 2.364636455744962 7.0867e-09 au
q 1.962276608900384 9.041e-08 au
i 2.233607830487916 3.9607e-06 deg
node 159.000402866298 8.5406e-05 deg
peri 30.80145100821629 8.5829e-05 deg
M 57.40660411737039 8.904e-06 deg
tp 2458788.710534483537
(2019-Nov-01.21053448)
3.2547e-05 TDB
period 1328.143490774024
3.64
5.9706e-06
1.635e-08
d
yr
n .2710550497749283 1.2185e-09 deg/d
Q 2.76699630258954 8.2925e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1694  
   data-arc span      16004 days (43.82 yr)  
   first obs. used      1976-04-01  
   last obs. used      2020-01-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51783  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 19:03:22  

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. 2019-August); 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

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2104-Sep-23 09:54 00:02 Psych 0.0335957989520238 0.0335877215193947 0.0336038770407523 4.34678430579754 4.34678422294609 2489795.912509915 2.24225889802644 465.933949205866 35.2730386815292 30.3527156677253 72541.2507016567 T 29 CATAB v2.0f-lin.ifort 2020-Feb-22 19:03:36 2020-Feb-22 19:03
2144-Sep-13 13:46 00:02 Psych 0.0278221618545434 0.0278124476067539 0.0278318791841802 4.5794423068629 4.57944221190093 2504396.073812922 2.18027013476505 669.72651321678 35.2399617378423 -43.7753305803277 81775.0306120403 T 29 CATAB v2.0f-lin.ifort 2020-Feb-22 19:03:36 2020-Feb-22 19:03
2184-Sep-14 23:03 00:03 Psych 0.0207038088786135 0.0207030982450231 0.0207045196172996 4.48282264659503 4.48282251623293 2519007.460465515 3.25198418450025 844.090402055573 35.2790962477641 89.7929487855556 87726.1096653464 T 29 CATAB v2.0f-lin.ifort 2020-Feb-22 19:03:36 2020-Feb-22 19:03

Alternate Designations
 1976 GA2 = 1994 CD2 
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