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21465 Michelepatt (1998 HG90)
Classification: Main-belt Asteroid          SPK-ID: 2021465
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1129287397684453 3.1058e-08  
a 2.268922966512207 7.1218e-09 au
q 2.012696355272301 7.0757e-08 au
i 4.935483949434497 3.525e-06 deg
node 176.5529356741201 4.2325e-05 deg
peri 40.96068145093513 4.5664e-05 deg
M 280.0922665244763 1.8171e-05 deg
tp 2459673.585860904540
(2022-Apr-04.08586090)
6.3581e-05 TDB
period 1248.326107962863
3.42
5.8775e-06
1.609e-08
d
yr
n .2883861818667577 1.3578e-09 deg/d
Q 2.525149577752114 7.9261e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1087  
   data-arc span      10929 days (29.92 yr)  
   first obs. used      1991-03-13  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51836  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:45:56  

Additional Information
 Earth MOID = 1.00941 au 
 Jupiter MOID = 2.44059 au 
 T_jup = 3.601 
[ 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 15.71   n/a MPCxxxxx  

21465 Michelepatt           Discovered 1998 Apr. 21 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Michele Patterson mentored a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors. She teaches at the Coral Reef Senior High School, Miami, Florida.
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 HG90 = 1991 EP7 = 1999 TK251 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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