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21798 Mitchweegman (1999 SZ16)
Classification: Main-belt Asteroid          SPK-ID: 2021798
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1632185189787274 2.9115e-08  
a 2.245771150530936 6.6802e-09 au
q 1.879219709376124 6.6434e-08 au
i 6.506945182992751 3.3109e-06 deg
node 118.4724347429427 2.7626e-05 deg
peri 267.8483833883455 2.9405e-05 deg
M 140.1936937055294 1.0837e-05 deg
tp 2458917.789831949255
(2020-Mar-09.28983195)
3.6287e-05 TDB
period 1229.268278359594
3.37
5.4849e-06
1.502e-08
d
yr
n .2928571462694902 1.3067e-09 deg/d
Q 2.612322591685748 7.7706e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2001  
   data-arc span      15196 days (41.60 yr)  
   first obs. used      1979-10-23  
   last obs. used      2021-05-31  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4927  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 05:11:33  

Additional Information
 Earth MOID = .896091 au 
 Jupiter MOID = 2.85421 au 
 T_jup = 3.605 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.63   n/a MPCxxxxx  
rotation period rot_per 50.666 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]

21798 Mitchweegman           Discovered 1999 Sept. 30 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Mitch Dale Weegman (b. 1988) was awarded second place in the 2005 Intel International Science and Engineering Fair for his environmental sciences team project. He attends the Winona Senior High School, Winona, Minnesota, U.S.A.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050822/MPCPages.arcLast Updated: 2005-08-26

Alternate Designations
 1999 SZ16 = 1979 UQ1 = 1998 HA105 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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