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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 ]

[ show orbit diagram ]
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 
[ 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1950-Dec-05 07:09 00:02 Jupiter 1.91303145309607 1.91303106341209 1.91303184278016 3.65375155764683 3.53049165758998 2433620.797643594 1.57305151580427 92.3154887906342 16.5232439105002 -84.4422209614055 3558947.72559606 T 40 CATAB v2.0g-lin.ifort 2021-May-04 03:16:56 2021-May-04 03:16
1999-May-10 15:08 < 00:01 Jupiter 1.91337814750569 1.91337776762241 1.91337852738897 4.22546409800148 4.1193662372001 2451309.130575088 0.416347033519946 67.1880747809848 16.1436850448015 -85.4274634009745 3975675.18515071 T 40 CATAB v2.0g-lin.ifort 2021-May-04 03:16:56 2021-May-04 03:16
2057-May-14 09:09 < 00:01 Jupiter 1.94001880010503 1.94001839343879 1.94001920677127 3.48748236387253 3.35995872248027 2472497.881439076 0.991507931108837 51.7571867525021 18.597311164369 -85.4946610121922 3648693.21319339 T 40 CATAB v2.0g-lin.ifort 2021-May-04 03:16:56 2021-May-04 03:16
2105-Oct-23 02:37 00:02 Jupiter 1.89499101772201 1.8949906597197 1.89499137572433 4.06732693851226 3.95590558918246 2490190.608807880 2.05011406608144 124.710655074481 15.4154939919586 -88.5040545047195 3864903.69082878 T 40 CATAB v2.0g-lin.ifort 2021-May-04 03:16:56 2021-May-04 03:16
2154-Mar-23 03:12 00:03 Jupiter 1.9883007802359 1.98829983942644 1.98830172104558 4.4111737238214 4.31351912079339 2507873.633612877 3.12314488946364 62.9879430714696 32.9513631175486 -54.7541587058622 3222420.59601722 T 40 CATAB v2.0g-lin.ifort 2021-May-04 03:16:56 2021-May-04 03:16
2163-Oct-22 03:37 00:04 Jupiter 1.97316438042411 1.9731634785013 1.97316528234782 3.35213765951717 3.22153451329902 2511373.650835153 3.57915507293263 93.579823299936 27.4322395079494 -60.931129224574 3786370.35705285 T 40 CATAB v2.0g-lin.ifort 2021-May-04 03:16:56 2021-May-04 03:16

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