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

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1297306356341144 3.1983e-08  
a 2.280364624217259 6.898e-09 au
q 1.984531472040006 7.2094e-08 au
i 1.749786754561723 3.8043e-06 deg
node 220.7786234539367 0.00011065 deg
peri 46.66102822798626 0.00011183 deg
M 210.9393120333738 1.8868e-05 deg
tp 2459917.293421884280
(2022-Dec-03.79342188)
6.7205e-05 TDB
period 1257.780535135581
3.44
5.7071e-06
1.563e-08
d
yr
n .286218453810938 1.2987e-09 deg/d
Q 2.576197776394512 7.7929e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1704  
   data-arc span      10981 days (30.06 yr)  
   first obs. used      1991-03-11  
   last obs. used      2021-04-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50515  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:32:59  

Additional Information
 Earth MOID = .969009 au 
 Jupiter MOID = 2.49091 au 
 T_jup = 3.594 
[ 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 14.97   n/a MPCxxxxx  
diameter diameter 4.725 km 1.040 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  
geometric albedo albedo 0.079   0.035 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  

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

Alternate Designations
 1998 FH65 = 1991 EM3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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