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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04690177762361286 3.0647e-08  
a 3.049152757961461 1.5654e-08 au
q 2.906142073367127 9.8522e-08 au
i 9.71696756037089 4.0092e-06 deg
node 28.67225992280813 1.9386e-05 deg
peri 84.39848932573753 4.8942e-05 deg
M 283.5430697103113 4.4739e-05 deg
tp 2459613.529961676150
(2022-Feb-03.02996168)
0.00024223 TDB
period 1944.765316107217
5.32
1.4976e-05
4.1e-08
d
yr
n .1851123099627271 1.4255e-09 deg/d
Q 3.192163442555796 1.6388e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2471  
   data-arc span      10936 days (29.94 yr)  
   first obs. used      1991-04-11  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41284  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 03:16:51  

Additional Information
 Earth MOID = 1.94359 au 
 Jupiter MOID = 1.87355 au 
 T_jup = 3.214 
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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 12.71   n/a MPCxxxxx  

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

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