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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1295301958396554 2.5955e-08  
a 2.325183173697246 6.8056e-09 au
q 2.024001741845171 6.1584e-08 au
i 6.78445861598119 3.041e-06 deg
node 136.6178151969305 2.9608e-05 deg
peri 144.780264349934 3.3235e-05 deg
M 8.616647270917399 1.4384e-05 deg
tp 2459169.502976076782
(2020-Nov-16.00297608)
5.1735e-05 TDB
period 1295.042986153275
3.55
5.6857e-06
1.557e-08
d
yr
n .2779830506393647 1.2204e-09 deg/d
Q 2.626364605549322 7.6871e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1758  
   data-arc span      15904 days (43.54 yr)  
   first obs. used      1977-02-19  
   last obs. used      2020-09-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49173  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:21:24  

Additional Information
 Earth MOID = 1.01001 au 
 Jupiter MOID = 2.51204 au 
 T_jup = 3.554 
[ 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 14.73   n/a E2021B10  
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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