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41800 Robwilliams (2000 WM19)
Classification: Main-belt Asteroid          SPK-ID: 2041800
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2326746177000797 6.0544e-08  
a 2.604151554601791 2.9204e-08 AU
q 1.998231587201751 1.581e-07 AU
i 25.01200597099715 1.2661e-05 deg
node 220.4937148288758 1.5981e-05 deg
peri 271.389848733586 3.1397e-05 deg
M 80.44204002591901 2.6636e-05 deg
tp 2456657.512427054605
(2013-Dec-31.01242705)
0.00011224 JED
period 1534.962641680366
4.20
2.5821e-05
7.069e-08
d
yr
n .2345333952922125 3.9453e-09 deg/d
Q 3.210071522001832 3.6e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      614  
   data-arc span      5820 days (15.93 yr)  
   first obs. used      1998-06-25  
   last obs. used      2014-06-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .56528  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-16 14:48:05  

Additional Information
 Earth MOID = 1.17834 AU 
 T_jup = 3.245 
[ 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 MPO250607  

41800 Robwilliams           Discovered 2000 Nov. 25 by C. W. Juels at Fountain Hills.
Robert A. Williams (b. 1942) is a psychiatrist and author who has been the director of the Biological Psychiatry Institute in Phoenix since 1987. His recent works include Brain Basics (1999)---a book for everyone about biological psychiatry---and the Merry The Cranberry Series of titles about children's values (2002).
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040306/MPCPages.arcLast Updated: 2004-03-08
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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