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JPL Small-Body Database Browser
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20455 Pennell (1999 LE4)
Classification: Main-belt Asteroid          SPK-ID: 2020455
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1290535789291917 3.3022e-08  
a 2.32483896173827 8.6706e-09 au
q 2.02481017329192 7.4987e-08 au
i 6.783379313157181 3.8754e-06 deg
node 136.6212836959195 3.0185e-05 deg
peri 144.7581590165742 3.3822e-05 deg
M 201.7820265363664 1.5059e-05 deg
tp 2459169.537721363142
(2020-Nov-16.03772136)
5.479e-05 TDB
period 1294.755426366377
3.54
7.2433e-06
1.983e-08
d
yr
n .2780447895169746 1.5555e-09 deg/d
Q 2.624867750184619 9.7896e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1381  
   data-arc span      15356 days (42.04 yr)  
   first obs. used      1977-02-19  
   last obs. used      2019-03-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53026  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 23:41:32  

Additional Information
 Earth MOID = 1.01211 au 
 Jupiter MOID = 2.51351 au 
 T_jup = 3.555 
[ 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 MPO358826  
diameter diameter 2.756 km 0.107 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.336   0.045 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20455 Pennell           Discovered 1999 June 9 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Jordan William Pennell (b. 1990) is a finalist in the 2004 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition, for his behavioral science project. He attends the Our Saviour School, Jacksonville, Illinois.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20041028/MPCPages.arcLast Updated: 2004-10-29

[ show close-approach data ]
Alternate Designations
 1999 LE4 = 1977 DM6 = 1989 TB10 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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