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7807 Grier (1975 SJ1)
Classification: Main-belt Asteroid          SPK-ID: 2007807
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09892493610273623 4.1579e-08  
a 3.174137948016084 2.1243e-08 au
q 2.860136554327323 1.3421e-07 au
i 13.22460325479149 5.5946e-06 deg
node 200.6665983950859 1.7685e-05 deg
peri 51.01496301738288 3.0924e-05 deg
M 9.28078219590158 2.5584e-05 deg
tp 2458547.250050206081
(2019-Mar-04.75005021)
0.00014665 TDB
period 2065.556708601162
5.66
2.0736e-05
5.677e-08
d
yr
n .1742871539188094 1.7496e-09 deg/d
Q 3.488139341704846 2.3345e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1489  
   data-arc span      16086 days (44.04 yr)  
   first obs. used      1975-09-30  
   last obs. used      2019-10-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51155  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 03:05:10  

Additional Information
 Earth MOID = 1.8688 au 
 Jupiter MOID = 1.56363 au 
 T_jup = 3.152 
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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 12.9   n/a MPO347588  

7807 Grier           Discovered 1975 Sept. 30 by S. J. Bus at Palomar.
Jennifer Grier (b. 1968) is involved in numerous aspects of planetary science education and research. Her research has focused on planetary surface ages via crater counting and radiometric dating. In 2006 she became the Education Officer for the AAS Division of Planetary Sciences.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20070402/MPCPages.arcLast Updated: 2007-07-05

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Alternate Designations
 1975 SJ1 = 1981 UW26 
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