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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09808940620886988 3.7633e-08  
a 3.169517382162357 1.7074e-08 au
q 2.85862130417736 1.155e-07 au
i 13.22635253546689 5.3284e-06 deg
node 200.5974005532066 1.349e-05 deg
peri 50.34317866947848 2.8882e-05 deg
M 114.7298087547227 2.5879e-05 deg
tp 2458543.656506096831
(2019-Mar-01.15650610)
0.00014652 TDB
period 2061.048130139128
5.64
1.6654e-05
4.56e-08
d
yr
n .1746684100849691 1.4114e-09 deg/d
Q 3.480413460147354 1.8748e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1989  
   data-arc span      16541 days (45.29 yr)  
   first obs. used      1975-09-30  
   last obs. used      2021-01-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46784  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:39:31  

Additional Information
 Earth MOID = 1.86565 au 
 Jupiter MOID = 1.56633 au 
 T_jup = 3.154 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457288.5 (2015-Sep-23.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09761888291267133 3.7127e-08  
q 2.861766791322745 1.135e-07 au
tp 2456490.023416209596
(2013-Jul-16.52341621)
0.00014581 TDB
node 200.6991754984442 1.3466e-05 deg
peri 51.96216968165461 2.9269e-05 deg
i 13.23673348596098 5.3324e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1989  
   data-arc span      16541 days (45.29 yr)  
   first obs. used      1975-09-30  
   last obs. used      2021-01-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46784  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:39:31  

Additional Information
 Jupiter MOID = 1.56633 au 
 T_jup = 3.154 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.378415227621669E-15 -4.17918756816293E-15 -1.741099954319852E-12 1.360489194210133E-15 -3.564246870828806E-13 -6.623600256404003E-16
q -4.17918756816293E-15 1.28815592374916E-14 5.810978827037823E-12 -4.663280493945194E-15 1.187072941300975E-12 2.81603068080241E-15
tp -1.741099954319852E-12 5.810978827037823E-12 2.126173102228198E-8 -5.494477467125416E-12 3.790916668818929E-9 -4.389595857445477E-12
node 1.360489194210133E-15 -4.663280493945194E-15 -5.494477467125416E-12 1.813282054785005E-10 -1.772072663919806E-10 -1.713240701986928E-11
peri -3.564246870828806E-13 1.187072941300975E-12 3.790916668818929E-9 -1.772072663919806E-10 8.56688264157951E-10 1.599866585486207E-11
i -6.623600256404003E-16 2.81603068080241E-15 -4.389595857445477E-12 -1.713240701986928E-11 1.599866585486207E-11 2.843397247714323E-11

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 12.96   n/a E2021B10  

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

[ show close-approach data ]
Alternate Designations
 1975 SJ1 = 1981 UW26 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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