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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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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3442081138513274 5.0352e-08  
a 2.200886260765976 1.1041e-08 au
q 1.443323352146418 1.1143e-07 au
i 5.402166569121563 7.1105e-06 deg
node 13.3806661821107 5.2491e-05 deg
peri 308.945713251223 5.3569e-05 deg
M 25.36475100280598 1.5777e-05 deg
tp 2459312.472212512323
(2021-Apr-07.97221251)
5.1775e-05 TDB
period 1192.600057150852
3.27
8.9739e-06
2.457e-08
d
yr
n .3018614646556767 2.2714e-09 deg/d
Q 2.958449169385533 1.4841e-08 au
  Orbit Determination Parameters
   # obs. used (total)      311  
   data-arc span      12025 days (32.92 yr)  
   first obs. used      1988-08-13  
   last obs. used      2021-07-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .58252  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 16:00:48  

Additional Information
 Earth MOID = .439346 au 
 Jupiter MOID = 2.40084 au 
 T_jup = 3.580 
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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 16.53   n/a E2021B10  

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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