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21455 Mcfarland (1998 HH41)
Classification: Main-belt Asteroid          SPK-ID: 2021455
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1179481517562256 3.8385e-08  
a 2.581995458557107 1.1976e-08 au
q 2.277453866377328 9.991e-08 au
i 2.841440123603561 4.3314e-06 deg
node 149.1522628691882 7.1256e-05 deg
peri 321.3051385322822 7.3874e-05 deg
M 290.4460804840202 2.2684e-05 deg
tp 2459689.286296097967
(2022-Apr-19.78629610)
9.6833e-05 TDB
period 1515.415196278796
4.15
1.0543e-05
2.887e-08
d
yr
n .2375586577751129 1.6528e-09 deg/d
Q 2.886537050736886 1.3388e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1244  
   data-arc span      8771 days (24.01 yr)  
   first obs. used      1996-12-02  
   last obs. used      2020-12-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52812  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:45:51  

Additional Information
 Earth MOID = 1.29527 au 
 Jupiter MOID = 2.20855 au 
 T_jup = 3.413 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.03   n/a E2020-QM5  

21455 Mcfarland           Discovered 1998 Apr. 20 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Jennifer McFarland mentored a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors. She teaches at 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 HH41 = 2000 SQ156 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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