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91199 Johngray (1998 SS147)
Classification: Outer Main-belt Asteroid          SPK-ID: 2091199
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06475064945729626 5.4747e-08  
a 3.235799651259003 2.7179e-08 au
q 3.02627952232629 1.7765e-07 au
i 22.06693660283128 5.4904e-06 deg
node 31.46615028989341 1.2985e-05 deg
peri 168.4172364652201 4.5481e-05 deg
M 90.53581980859299 4.101e-05 deg
tp 2458465.826326780101
(2018-Dec-13.32632678)
0.00024297 TDB
period 2126.037216718223
5.82
2.6786e-05
7.334e-08
d
yr
n .1693291148288083 2.1334e-09 deg/d
Q 3.445319780191717 2.8938e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1672  
   data-arc span      7986 days (21.86 yr)  
   first obs. used      1998-09-18  
   last obs. used      2020-07-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4422  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 08:16:16  

Additional Information
 Earth MOID = 2.02406 au 
 Jupiter MOID = 1.5181 au 
 T_jup = 3.067 
[ 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 13.3   n/a MPO266324  

91199 Johngray           Discovered 1998 Sept. 20 by E. W. Elst at the European Southern Observatory.
British philosopher John Gray (b. 1948) considers morality to be an illusion and mankind a rapacious species engaged in wiping out other forms of life while destroying its natural environment.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080618/MPCPages.arcLast Updated: 2008-06-20

[ show close-approach data ]
Alternate Designations
 1998 SS147 = 2001 DX21 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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