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30785 Greeley (1988 PX)
Classification: Mars-crossing Asteroid          SPK-ID: 2030785
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 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3441304552941655 5.1573e-08  
a 2.200769138014536 1.1607e-08 au
q 1.443417452552245 1.1465e-07 au
i 5.401836736830243 7.1241e-06 deg
node 13.38797547028755 5.319e-05 deg
peri 308.9694028782926 5.4275e-05 deg
M 265.7995114197066 1.5952e-05 deg
tp 2459312.540390127484
(2021-Apr-08.04039013)
5.4785e-05 TDB
period 1192.504859994904
3.26
9.4338e-06
2.583e-08
d
yr
n .3018855621280558 2.3882e-09 deg/d
Q 2.958120823476826 1.5601e-08 au
  Orbit Determination Parameters
   # obs. used (total)      303  
   data-arc span      11599 days (31.76 yr)  
   first obs. used      1988-08-13  
   last obs. used      2020-05-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58729  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:04:32  

Additional Information
 Earth MOID = .440132 au 
 Jupiter MOID = 2.40145 au 
 T_jup = 3.580 
[ 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 16.5   n/a MPO468102  

30785 Greeley           Discovered 1988 Aug. 13 by C. S. Shoemaker and E. M. Shoemaker at Palomar.
Ronald Greeley (b. 1939) has been involved in lunar and planetary studies since 1967. His current research focuses on understanding planetary surface processes and geological histories and involves a combination of spacecraft data analysis, laboratory experiments and geological field studies on the earth.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030501/MPCPages.arcLast Updated: 2003-10-02

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