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21861 Maryhedberg (1999 TU189)
Classification: Main-belt Asteroid          SPK-ID: 2021861
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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04929317468299816 5.2624e-08  
a 2.964169715481957 1.986e-08 au
q 2.818056379906652 1.5755e-07 au
i 9.458470856284011 4.6943e-06 deg
node 284.9493990165858 3.5435e-05 deg
peri 244.6910581679345 6.1451e-05 deg
M 278.5483201014279 5.1961e-05 deg
tp 2459622.245610026763
(2022-Feb-11.74561003)
0.00027048 TDB
period 1864.030549139067
5.10
1.8733e-05
5.129e-08
d
yr
n .1931298820002022 1.941e-09 deg/d
Q 3.110283051057262 2.0839e-08 au
  Orbit Determination Parameters
   # obs. used (total)      874  
   data-arc span      9207 days (25.21 yr)  
   first obs. used      1995-11-28  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51863  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:54:21  

Additional Information
 Earth MOID = 1.84135 au 
 Jupiter MOID = 1.97808 au 
 T_jup = 3.243 
[ 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 14.4   n/a MPO526167  

21861 Maryhedberg           Discovered 1999 Oct. 12 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Mary Lucia Hedberg (b. 1991) is a finalist in the 2005 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition, for her engineering project. She attends the North Attleboro Middle School, North Attleboro, Massachusetts.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20051019/MPCPages.arcLast Updated: 2005-10-26

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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