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23981 Patjohnson (1999 LC4)
Classification: Main-belt Asteroid          SPK-ID: 2023981
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07924895713748994 3.3218e-08  
a 2.304546420566284 8.2094e-09 au
q 2.121913520061471 7.6629e-08 au
i 6.915986399018902 3.9126e-06 deg
node 167.1415283562392 2.8787e-05 deg
peri 246.8173000402197 3.8458e-05 deg
M 208.9198639111178 2.4774e-05 deg
tp 2459536.767508094764
(2021-Nov-18.26750809)
8.8543e-05 TDB
period 1277.840409149075
3.50
6.828e-06
1.869e-08
d
yr
n .281725321427053 1.5054e-09 deg/d
Q 2.487179321071098 8.86e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1802  
   data-arc span      9178 days (25.13 yr)  
   first obs. used      1995-04-26  
   last obs. used      2020-06-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49986  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 19:11:31  

Additional Information
 Earth MOID = 1.14296 au 
 Jupiter MOID = 2.74832 au 
 T_jup = 3.575 
[ 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 14.7   n/a MPO474081  
diameter diameter 2.505 km 0.470 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.257   0.171 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

23981 Patjohnson           Discovered 1999 June 9 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Patricia Johnson mentored a finalist in the 2007 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition. She teaches at the St. Paul's School, Clearwater, Florida.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20071026/MPCPages.arcLast Updated: 2007-10-28

[ show close-approach data ]
Alternate Designations
 1999 LC4 = 2000 NC1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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