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30211 Sheilah (2000 GN123)
Classification: Main-belt Asteroid          SPK-ID: 2030211
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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1299767913938634 3.4485e-08  
a 2.261466469749099 6.2028e-09 au
q 1.967528314166304 7.9493e-08 au
i 6.769893080756318 4.2439e-06 deg
node 175.1999706906258 2.6722e-05 deg
peri 231.8498897803149 3.085e-05 deg
M 259.6238579809548 1.6722e-05 deg
tp 2459742.847179252995
(2022-Jun-12.34717925)
5.8317e-05 TDB
period 1242.177493805457
3.40
5.1106e-06
1.399e-08
d
yr
n .2898136552910218 1.1924e-09 deg/d
Q 2.555404625331894 7.009e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1841  
   data-arc span      10864 days (29.74 yr)  
   first obs. used      1991-11-10  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48372  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 23:40:58  

Additional Information
 Earth MOID = .983828 au 
 Jupiter MOID = 2.81946 au 
 T_jup = 3.599 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457285.5 (2015-Sep-20.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .129205526129253 3.4352e-08  
q 1.968940723540687 7.9052e-08 au
tp 2457258.838555591186
(2015-Aug-24.33855559)
5.5323e-05 TDB
node 175.2348999635254 2.6717e-05 deg
peri 231.803960074464 3.0928e-05 deg
i 6.769532194076041 4.2447e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1841  
   data-arc span      10864 days (29.74 yr)  
   first obs. used      1991-11-10  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48372  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 23:40:58  

Additional Information
 Jupiter MOID = 2.81946 au 
 T_jup = 3.599 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.180077809643781E-15 -2.709540513438483E-15 -7.616548519508987E-13 -1.648796839486409E-15 -2.017574867965655E-13 -1.028484904852732E-15
q -2.709540513438483E-15 6.249248092466296E-15 1.80189614602914E-12 3.896232900854898E-15 4.777142496096068E-13 2.547576682840117E-15
tp -7.616548519508987E-13 1.80189614602914E-12 3.060581338605116E-9 5.076292990537369E-12 8.688195770435131E-10 3.208628413299286E-12
node -1.648796839486409E-15 3.896232900854898E-15 5.076292990537369E-12 7.1381333460895E-10 -7.068970272966402E-10 6.37407045372227E-12
peri -2.017574867965655E-13 4.777142496096068E-13 8.688195770435131E-10 -7.068970272966402E-10 9.565347879383986E-10 -5.379459569677892E-12
i -1.028484904852732E-15 2.547576682840117E-15 3.208628413299286E-12 6.37407045372227E-12 -5.379459569677892E-12 1.80173902902008E-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 14.6   n/a MPO468094  
diameter diameter 3.320 km 0.614 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
geometric albedo albedo 0.271   0.086 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

30211 Sheilah           Discovered 2000 Apr. 7 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Sheila Harrington mentored a finalist in the 2014 Broadcom MASTERS, a math and science competition for middle school students. She teaches at the Andover West Middle School, Andover, Massachusetts.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2015-01-05Last Updated: 2015-01-07

Alternate Designations
 2000 GN123 = 1998 XE90 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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