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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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456919.5 (2014-Sep-19.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .129820333461008 3.2029e-08  
q 1.984900860967167 7.2218e-08 au
tp 2457401.756427325115
(2016-Jan-14.25642733)
6.1567e-05 TDB
node 220.8753461033171 0.00011066 deg
peri 46.44357418236281 0.00011183 deg
i 1.74921171382898 3.8046e-06 deg
  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
 Jupiter MOID = 2.49091 au 
 T_jup = 3.594 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.025826777767606E-15 -2.305135755377155E-15 -5.989218906540152E-14 -5.362250226417079E-16 -2.92993536329527E-14 1.456602055443101E-16
q -2.305135755377155E-15 5.215432233193107E-15 2.969981154413776E-13 1.547705706453346E-15 1.036943426906926E-13 -3.53595229548403E-16
tp -5.989218906540152E-14 2.969981154413776E-13 3.790468372629538E-9 -1.69972021725033E-12 1.004305333823096E-9 -4.251909300750264E-14
node -5.362250226417079E-16 1.547705706453346E-15 -1.69972021725033E-12 1.224515446518099E-8 -1.223947210567299E-8 -3.199183564777978E-12
peri -2.92993536329527E-14 1.036943426906926E-13 1.004305333823096E-9 -1.223947210567299E-8 1.250673688166878E-8 3.194472054168011E-12
i 1.456602055443101E-16 -3.53595229548403E-16 -4.251909300750264E-14 -3.199183564777978E-12 3.194472054168011E-12 1.447525207047559E-11

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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