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21854 Brendandwyer (1999 TJ147)
Classification: Main-belt Asteroid          SPK-ID: 2021854
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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1267893250604002 2.5465e-08  
a 2.617168415918166 9.425e-09 au
q 2.285339398894505 6.8003e-08 au
i 4.590868109864125 3.5153e-06 deg
node 71.41942127787044 4.3252e-05 deg
peri 243.8531661371733 4.6533e-05 deg
M 49.09447365569734 1.6332e-05 deg
tp 2458989.600261977619
(2020-May-20.10026198)
7.0317e-05 TDB
period 1546.48578617048
4.23
8.3539e-06
2.287e-08
d
yr
n .2327858446675143 1.2575e-09 deg/d
Q 2.948997432941827 1.062e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1487  
   data-arc span      10617 days (29.07 yr)  
   first obs. used      1991-12-13  
   last obs. used      2021-01-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49976  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:54:44  

Additional Information
 Earth MOID = 1.2741 au 
 Jupiter MOID = 2.30963 au 
 T_jup = 3.391 
[ 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 14.77   n/a E2021B10  
diameter diameter 3.721 km 0.708 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.097   0.082 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21854 Brendandwyer           Discovered 1999 Oct. 7 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Brendan John Dwyer (b. 1991) is a finalist in the 2005 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition, for his environmental sciences project. He attends the Northport Middle School, Northport, 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: 20051019/MPCPages.arcLast Updated: 2005-10-26

Alternate Designations
 1999 TJ147 = 1998 KE22 = 1998 KK66 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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