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21903 Wallace (1999 VE12)
Classification: Main-belt Asteroid          SPK-ID: 2021903
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 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04690177637314377 3.0691e-08  
a 3.049152760620369 1.5674e-08 au
q 2.906142079714198 9.8612e-08 au
i 9.716967374641884 4.0124e-06 deg
node 28.67226173048186 1.9458e-05 deg
peri 84.39848743502722 4.8981e-05 deg
M 283.5430697514953 4.4762e-05 deg
tp 2459613.529961993921
(2022-Feb-03.02996199)
0.00024237 TDB
period 1944.765318651014
5.32
1.4996e-05
4.106e-08
d
yr
n .185112309720596 1.4274e-09 deg/d
Q 3.19216344152654 1.641e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2415  
   data-arc span      10874 days (29.77 yr)  
   first obs. used      1991-04-11  
   last obs. used      2021-01-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41085  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:54:58  

Additional Information
 Earth MOID = 1.94359 au 
 Jupiter MOID = 1.87355 au 
 T_jup = 3.214 
[ 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 12.70   n/a E2021B10  

21903 Wallace           Discovered 1999 Nov. 10 by C. W. Juels at Fountain Hills.
Patrick T. Wallace (b. 1946) is a specialist in telescope control software. From 1973 to 1980 he was on the staff of the Anglo-Australian Observatory. During 1982-2000 he directed the Starlink astronomical computing service in the U.K., and he is currently head of H.M. Nautical Almanac Office.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20011101/MPCPages.arcLast Updated: 2009-05-11

[ show close-approach data ]
Alternate Designations
 1999 VE12 = 1991 HL2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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