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7173 Sepkoski (1988 PL1)
Classification: Inner Main-belt Asteroid          SPK-ID: 2007173
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01338829823858998 7.4198e-08  
a 1.956158314802083 1.1242e-08 AU
q 1.929968683881615 1.4032e-07 AU
i 19.58251508261077 9.6467e-06 deg
node 247.0819056075753 1.8635e-05 deg
peri 94.98358389228939 0.00037978 deg
M 208.630600984053 0.00037976 deg
tp 2457420.684485330343
(2016-Feb-02.18448533)
0.0010551 JED
period 999.319649164937
2.74
8.6146e-06
2.359e-08
d
yr
n .3602450930498838 3.1055e-09 deg/d
Q 1.982347945722551 1.1393e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      718  
   data-arc span      11074 days (30.32 yr)  
   first obs. used      1983-11-29  
   last obs. used      2014-03-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .43819  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 18:54:40  

Additional Information
 Earth MOID = .943658 AU 
 T_jup = 3.815 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.8 mag n/a MPO279590  
rotation period rot_per 2.5006 h n/a Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) Published Reference List:
[Warner, B.D (2011) Minor Planet Bul. 38, 25-31.]
[Han, X.L.; Li, B.; Zhao, H. (2013) Minor Planet Bul. 40, 14-15.]
[Warner, B.D. (2014) Minor Planet Bul. 2014, 102-112.]

7173 Sepkoski           Discovered 1988 Aug. 15 by C. S. Shoemaker and E. M. Shoemaker at Palomar.
Named in memory of paleontologist J. John Sepkoski Jr. (1948-1999). His far-reaching work made a major contribution to quantifying the nature of life's diversity through time. The compilation of a huge database, begun while he was at the University of Rochester and continued at the University of Chicago, enabled researchers to combine mathematical modeling and paleoecology with massive data arrays. Together with his colleague David Raup, Sepkoski developed the theory that catastrophic extinction events have a 26-million-year periodicity.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990728/MPCPages.arcLast Updated: 2010-06-11

Alternate Designations
 1988 PL1 = 1983 WY 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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