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21431 Amberhess (1998 FR113)
Classification: Main-belt Asteroid          SPK-ID: 2021431
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1119945329435146 3.0178e-08  
a 2.340077997037551 9.9568e-09 au
q 2.078002054707935 7.1164e-08 au
i 6.20104758238993 3.5761e-06 deg
node 248.2575180206865 3.6978e-05 deg
peri 18.44199593076921 4.1864e-05 deg
M 63.29556203097726 1.8758e-05 deg
tp 2458970.612855248400
(2020-May-01.11285525)
6.8306e-05 TDB
period 1307.506710661217
3.58
8.345e-06
2.285e-08
d
yr
n .2753331949003497 1.7573e-09 deg/d
Q 2.602153939367166 1.1072e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1403  
   data-arc span      15346 days (42.02 yr)  
   first obs. used      1978-11-29  
   last obs. used      2020-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53985  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:52:34  

Additional Information
 Earth MOID = 1.0615 au 
 Jupiter MOID = 2.46084 au 
 T_jup = 3.549 
[ 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 15.21   n/a E2021B10  
diameter diameter 2.429 km 0.361 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.249   0.107 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

21431 Amberhess           Discovered 1998 Mar. 31 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Amber Irish Hess (b. 1987) is a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors, for her chemistry project. She attends the Robert Louis Stevenson School, Pebble Beach, California.
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 FR113 = 1978 WL5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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