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20321 Lightdonovan (1998 HJ19)
Classification: Main-belt Asteroid          SPK-ID: 2020321
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1164988334870526 3.0516e-08  
a 2.31294834594524 7.9082e-09 au
q 2.043492561726812 7.2917e-08 au
i 4.848164049008227 3.7117e-06 deg
node 349.3763783151105 4.0531e-05 deg
peri 55.18005490077158 4.4197e-05 deg
M 310.7844822843196 1.7911e-05 deg
tp 2459376.149486713453
(2021-Jun-10.64948671)
6.4273e-05 TDB
period 1284.834908821781
3.52
6.5895e-06
1.804e-08
d
yr
n .2801916398194124 1.437e-09 deg/d
Q 2.582404130163669 8.8295e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1233  
   data-arc span      9770 days (26.75 yr)  
   first obs. used      1994-04-08  
   last obs. used      2021-01-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53146  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:17:06  

Additional Information
 Earth MOID = 1.05556 au 
 Jupiter MOID = 2.77032 au 
 T_jup = 3.569 
[ 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 15.54   n/a E2021B10  

20321 Lightdonovan           Discovered 1998 Apr. 18 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Donna Light-Donovan mentored a finalist in the 2004 Intel Science Talent Search, a science competition for high school seniors. She teaches at the Croton-Harmon High School, Croton-on-Hudson, New York.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040415/MPCPages.arcLast Updated: 2004-04-20

Alternate Designations
 1998 HJ19 = 1996 XN10 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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