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21410 Cahill (1998 FH65)
Classification: Main-belt Asteroid          SPK-ID: 2021410
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1297103751376389 4.3841e-08  
a 2.280923613111748 1.1583e-08 AU
q 1.985064155594725 1.0273e-07 AU
i 1.749199201206332 5.4769e-06 deg
node 220.8423188318969 0.00015474 deg
peri 46.53829128688827 0.00015641 deg
M 245.1202620671919 2.494e-05 deg
tp 2457402.018420394461
(2016-Jan-14.51842039)
8.8438e-05 JED
period 1258.243045667023
3.44
9.5847e-06
2.624e-08
d
yr
n .2861132443685837 2.1795e-09 deg/d
Q 2.576783070628772 1.3086e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1071  
   data-arc span      8854 days (24.24 yr)  
   first obs. used      1991-03-11  
   last obs. used      2015-06-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5375  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 12:29:01  

Additional Information
 Earth MOID = .971094 AU 
 T_jup = 3.594 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.9 mag n/a MPO324507  

21410 Cahill           Discovered 1998 Mar. 20 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
James Andrew Cahill (b. 1987) is a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors, for his earth and planetary science project. He attends the Flagstaff High School, Flagstaff, Arizona.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050224/MPCPages.arcLast Updated: 2005-02-28

[ show close-approach data ]
Alternate Designations
 1998 FH65 = 1991 EM3 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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