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9325 Stonehenge (1989 GG4)
Classification: Main-belt Asteroid          SPK-ID: 2009325
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 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06608153735356465 3.8626e-08  
a 2.430145663061404 8.4197e-09 au
q 2.269557901653209 9.3396e-08 au
i 5.89534766630206 3.5899e-06 deg
node 211.5098243561137 3.8781e-05 deg
peri 302.423823690602 4.8038e-05 deg
M 115.1166189820049 2.7125e-05 deg
tp 2458558.031446214105
(2019-Mar-15.53144621)
0.00010457 TDB
period 1383.715755131953
3.79
7.1912e-06
1.969e-08
d
yr
n .2601690402561543 1.3521e-09 deg/d
Q 2.5907334244696 8.9761e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2379  
   data-arc span      18453 days (50.52 yr)  
   first obs. used      1970-03-04  
   last obs. used      2020-09-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46745  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:14:26  

Additional Information
 Earth MOID = 1.28478 au 
 Jupiter MOID = 2.40328 au 
 T_jup = 3.498 
[ 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 13.7   n/a MPO458921  
rotation period rot_per 4.607 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.]

9325 Stonehenge           Discovered 1989 Apr. 3 by E. W. Elst at the European Southern Observatory.
Stonehenge, a prehistoric circular complex of large standing stones, is located north of the city of Salisbury, England. Some parts of Stonehenge may have been used for astronomical observation.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20071124/MPCPages.arcLast Updated: 2007-11-26

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Alternate Designations
 1989 GG4 = 1970 EM2 = 1993 KF2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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