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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1713080741436211 3.6784e-08  
a 2.363749276500502 7.1347e-09 au
q 1.958819940184824 8.6633e-08 au
i 2.236636650719917 3.8232e-06 deg
node 158.9660848039824 8.4086e-05 deg
peri 30.82819089599412 8.4511e-05 deg
M 164.6658567316295 8.9787e-06 deg
tp 2458789.342173586659
(2019-Nov-01.84217359)
3.2187e-05 TDB
period 1327.396108988378
3.63
6.0099e-06
1.645e-08
d
yr
n .2712076655659024 1.2279e-09 deg/d
Q 2.768678612816181 8.3569e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1789  
   data-arc span      16208 days (44.38 yr)  
   first obs. used      1976-04-01  
   last obs. used      2020-08-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50713  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 20:52:51  

Additional Information
 Earth MOID = .960499 au 
 Jupiter MOID = 2.18428 au 
 T_jup = 3.528 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456497.5 (2013-Jul-24.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1702347296630529 3.6672e-08  
q 1.961822852791423 8.6259e-08 au
tp 2456133.274401790222
(2012-Jul-24.77440179)
3.1017e-05 TDB
node 159.0234101662799 8.4289e-05 deg
peri 30.76174647330438 8.4723e-05 deg
i 2.232597318460213 3.8185e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1789  
   data-arc span      16208 days (44.38 yr)  
   first obs. used      1976-04-01  
   last obs. used      2020-08-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50713  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 20:52:51  

Additional Information
 Jupiter MOID = 2.18428 au 
 T_jup = 3.528 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.34486154176765E-15 -3.156216010887951E-15 2.582072470736816E-14 1.409627901405855E-14 -5.561095759338032E-16 -3.091438993264916E-16
q -3.156216010887951E-15 7.440674579967309E-15 -7.272610680505608E-14 -3.302021733137575E-14 2.383616809216463E-17 7.668390469530807E-16
tp 2.582072470736816E-14 -7.272610680505608E-14 9.620555281199692E-10 9.487767536428078E-13 2.751277409460505E-10 1.100663740546291E-13
node 1.409627901405855E-14 -3.302021733137575E-14 9.487767536428078E-13 7.104563522418783E-9 -7.098550452676188E-9 8.632118174460135E-11
peri -5.561095759338032E-16 2.383616809216463E-17 2.751277409460505E-10 -7.098550452676188E-9 7.178003311354698E-9 -8.622780043084246E-11
i -3.091438993264916E-16 7.668390469530807E-16 1.100663740546291E-13 8.632118174460135E-11 -8.622780043084246E-11 1.458126756703409E-11

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 14.59   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

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