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7868 Barker (1984 UX2)
Classification: Main-belt Asteroid          SPK-ID: 2007868
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1984467450556235 1.0233e-08  
a 2.684664961434704 9.6282e-09 au
q 2.151901938273106 2.6706e-08 au
i 11.98862894818246 6.7705e-07 deg
node 15.48625574183514 3.3527e-06 deg
peri 324.1492859850201 6.735e-06 deg
M 115.9318693264996 5.2052e-06 deg
tp 2458683.091085698405
(2019-Jul-18.59108570)
2.198e-05 TDB
period 1606.695468905008
4.40
8.6433e-06
2.366e-08
d
yr
n .2240623733415682 1.2054e-09 deg/d
Q 3.217427984596303 1.1539e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2857  
   data-arc span      32688 days (89.49 yr)  
   first obs. used      1931-09-12  
   last obs. used      2021-03-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42502  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 20:06:45  

Additional Information
 Earth MOID = 1.15508 au 
 Jupiter MOID = 2.24233 au 
 T_jup = 3.315 
[ 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 12.87   n/a E2021B10  
diameter diameter 14.946 km 0.047 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
geometric albedo albedo 0.092   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

7868 Barker           Discovered 1984 Oct. 26 by E. Bowell at the Anderson Mesa Station of the Lowell Observatory.
Named in honor of Edwin S. Barker (b. 1940), a research scientist at the McDonald Observatory of the University of Texas at Austin. Barker is well known for his work on physical observations of both major and minor planets. He served as McDonald Observatory superintendent for several years in the 1980s, simultaneously continuing his planetary studies and vastly improving seeing conditions at the observatory. He also conducted an extensive atmospheric-monitoring and data-reduction program that resulted in the recommendation of locating the Hobby-Eberly Telescope on Mt. Fowlkes. In the early 1990s he very successfully served as discipline scientist at NASA headquarters, and in 1997-1998 was chair of the Division for Planetary Sciences of the American Astronomical Society. Citation written by P. J. Shelus.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990728/MPCPages.arcLast Updated: 2010-06-11

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Alternate Designations
 1984 UX2 = 1931 RD1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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