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JPL Small-Body Database Browser
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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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07924895523639505 3.371e-08  
a 2.304546419960484 8.3331e-09 au
q 2.121913523884841 7.7549e-08 au
i 6.915985389923305 4.0145e-06 deg
node 167.1415279438165 2.8795e-05 deg
peri 246.817303777954 3.9145e-05 deg
M 208.9198611792391 2.546e-05 deg
tp 2459536.767517580268
(2021-Nov-18.26751758)
9.0849e-05 TDB
period 1277.840408645212
3.50
6.9309e-06
1.898e-08
d
yr
n .2817253215381395 1.5281e-09 deg/d
Q 2.487179316036127 8.9935e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1737  
   data-arc span      8785 days (24.05 yr)  
   first obs. used      1995-04-26  
   last obs. used      2019-05-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5047  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 00:06:10  

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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