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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04704838195386955 3.0628e-08  
a 3.049744188587132 1.5626e-08 au
q 2.906258659140891 9.8502e-08 au
i 9.71625415212395 4.0089e-06 deg
node 28.67050398742484 1.9385e-05 deg
peri 84.23955100949922 4.883e-05 deg
M 319.9878211495189 4.466e-05 deg
tp 2459612.713718580452
(2022-Feb-02.21371858)
0.00024162 TDB
period 1945.33116978774
5.33
1.4951e-05
4.093e-08
d
yr
n .1850584648984371 1.4222e-09 deg/d
Q 3.193229718033373 1.6361e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2473  
   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      .41434  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:37:30  

Additional Information
 Earth MOID = 1.94416 au 
 Jupiter MOID = 1.87241 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 12.71   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

[ 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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