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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1130456437413037 3.1165e-08  
a 2.268655028946494 7.1195e-09 au
q 2.012193460772292 7.0964e-08 au
i 4.935389276882773 3.5767e-06 deg
node 176.5593568463923 4.2341e-05 deg
peri 40.99955930497553 4.572e-05 deg
M 223.5262956699621 1.8115e-05 deg
tp 2459673.648643426789
(2022-Apr-04.14864343)
6.3753e-05 TDB
period 1248.104991872442
3.42
5.8752e-06
1.609e-08
d
yr
n .2884372727809684 1.3578e-09 deg/d
Q 2.525116597120696 7.9243e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1077  
   data-arc span      10901 days (29.85 yr)  
   first obs. used      1991-03-13  
   last obs. used      2021-01-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51828  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:52:47  

Additional Information
 Earth MOID = 1.00727 au 
 Jupiter MOID = 2.44176 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 15.6   n/a MPO531263  

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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