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11781 Alexroberts (1966 PL)
Classification: Main-belt Asteroid          SPK-ID: 2011781
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 4 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1243966974698279 6.2541e-08  
a 2.358672552262103 1.2898e-08 AU
q 2.065261476347968 1.4921e-07 AU
i 7.313972430618281 7.2769e-06 deg
node 123.3727614984005 4.6334e-05 deg
peri 167.8635357737707 5.3907e-05 deg
M 85.77195168571698 2.8001e-05 deg
tp 2456485.258998757335
(2013-Jul-11.75899876)
0.00010243 JED
period 1323.122048839393
3.62
1.0853e-05
2.971e-08
d
yr
n .2720837433823904 2.2318e-09 deg/d
Q 2.652083628176239 1.4503e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      966  
   data-arc span      17192 days (47.07 yr)  
   first obs. used      1966-08-07  
   last obs. used      2013-09-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53684  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Nov-21 04:51:11  

Additional Information
 Earth MOID = 1.04904 AU 
 T_jup = 3.531 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.8 mag n/a MPO266021  

11781 Alexroberts           Discovered 1966 Aug. 7 at Bloemfontein.
Scots-born Alexander William Roberts (1857-1938) emigrated in 1883 to South Africa, where he taught at and became principal of Lovedale Training School in Eastern Cape Province. He was one of the most prolific observers of variable stars in the southern hemisphere, and his records are maintained at the Boyden Observatory.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060809/MPCPages.arcLast Updated: 2007-08-08

Alternate Designations
 1966 PL = 1994 CL10 = 1998 HU139 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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