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21387 Wafakhalil (1998 FW16)
Classification: Main-belt Asteroid          SPK-ID: 2021387
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .121553419920269 3.9385e-08  
a 2.36762936018311 8.1923e-09 au
q 2.079835914349214 9.2042e-08 au
i 3.481851218019187 4.0149e-06 deg
node 331.6732408727376 4.9381e-05 deg
peri 4.78405114496465 5.1045e-05 deg
M 277.1191496908274 1.4717e-05 deg
tp 2459506.851985542457
(2021-Oct-19.35198554)
5.5243e-05 TDB
period 1330.665821886229
3.64
6.9064e-06
1.891e-08
d
yr
n .2705412539188069 1.4042e-09 deg/d
Q 2.655422806017005 9.1881e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1643  
   data-arc span      9632 days (26.37 yr)  
   first obs. used      1994-01-07  
   last obs. used      2020-05-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52064  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:57:19  

Additional Information
 Earth MOID = 1.06832 au 
 Jupiter MOID = 2.6795 au 
 T_jup = 3.534 
[ 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 14.8   n/a MPO319352  
diameter diameter 2.524 km 0.439 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.401   0.091 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21387 Wafakhalil           Discovered 1998 Mar. 20 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Wafa Khalil (b. 1945), a 2004 Intel International Science and Engineering Fair Excellence in Teaching Award finalist, is a teacher at the MAST Academy High School, Miami, Florida, U.S.A.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20041226/MPCPages.arcLast Updated: 2004-12-25

Alternate Designations
 1998 FW16 = 2000 WN117 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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