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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1119465872179598 3.016e-08  
a 2.339495372629656 9.8196e-09 au
q 2.077596849851557 7.101e-08 au
i 6.201424987297166 3.5731e-06 deg
node 248.2493204543856 3.6954e-05 deg
peri 18.32103847745204 4.1837e-05 deg
M 117.4092117197206 1.8719e-05 deg
tp 2458970.233322306733
(2020-Apr-30.73332231)
6.8256e-05 TDB
period 1307.018433407988
3.58
8.2289e-06
2.253e-08
d
yr
n .2754360541506038 1.7341e-09 deg/d
Q 2.601393895407756 1.0919e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1411  
   data-arc span      15571 days (42.63 yr)  
   first obs. used      1978-11-29  
   last obs. used      2021-07-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5403  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:00:11  

Additional Information
 Earth MOID = 1.06282 au 
 Jupiter MOID = 2.46004 au 
 T_jup = 3.549 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1123412945372879 3.0266e-08  
q 2.076663835100185 7.1318e-08 au
tp 2456355.130717240775
(2013-Mar-03.63071724)
7.1831e-05 TDB
node 248.3722860648539 3.6919e-05 deg
peri 18.2821218357379 4.1731e-05 deg
i 6.204768561419731 3.5743e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1411  
   data-arc span      15571 days (42.63 yr)  
   first obs. used      1978-11-29  
   last obs. used      2021-07-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5403  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:00:11  

Additional Information
 Jupiter MOID = 2.46004 au 
 T_jup = 3.549 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.160411746483751E-16 -2.142287909269052E-15 -9.941707611252335E-14 -4.021248935771978E-15 -1.336817701035714E-14 -3.633699581237819E-16
q -2.142287909269052E-15 5.086214432868661E-15 8.966969068363387E-15 8.421839003395891E-15 -2.425296079818319E-14 9.908277663741466E-16
tp -9.941707611252335E-14 8.966969068363387E-15 5.159691531008869E-9 2.236049528802408E-11 1.41354400277777E-9 8.939044892205361E-13
node -4.021248935771978E-15 8.421839003395891E-15 2.236049528802408E-11 1.362975967341957E-9 -1.348410065349498E-9 -1.732149409173598E-11
peri -1.336817701035714E-14 -2.425296079818319E-14 1.41354400277777E-9 -1.348410065349498E-9 1.741463997676356E-9 1.749679009365927E-11
i -3.633699581237819E-16 9.908277663741466E-16 8.939044892205361E-13 -1.732149409173598E-11 1.749679009365927E-11 1.277582808070079E-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 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

Alternate Designations
 1998 FR113 = 1978 WL5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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