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5145 Pholus (1992 AD)
Classification: Centaur          SPK-ID: 2005145
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


Orbital Elements at Epoch 2454800.5 (2008-Nov-30.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5711459218137372 1.5326e-06  
a 20.35668709492995 8.0504e-05 AU
q 8.730048279022373 6.8623e-06 AU
i 24.65594140595672 2.0967e-05 deg
node 119.4416398364712 5.2892e-05 deg
peri 354.92235956 0.00012614 deg
M 67.49113932700851 0.00042178 deg
tp 2448511.185138335074
(1991-Sep-11.68513834)
0.0024684 JED
period 33547.41633904093
91.85
0.199
0.0005448
d
yr
n .0107310797458059 6.3657e-08 deg/d
Q 31.98332591083752 0.00012648 AU
  Orbit Determination Parameters
   # obs. used (total)      323  
   data-arc span      11267 days (30.85 yr)  
   first obs. used      1977-07-22  
   last obs. used      2008-05-27  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   quality code      1  
   fit RMS      .63891  
   data source      ORB  
   producer      Otto Matic  
   solution date      2008-Jun-20 15:40:28  

Additional Information
 Earth MOID = 7.74697 AU 
 T_jup = 3.207 
[ 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 7.0 mag n/a PDS3 (MPC 28113)  
rotation period rot_per 9.980 h n/a IAU Lightcurve Data
(A.W. Harris, E-mail Mar. 2006)
Published Reference List:
[Buie, M.W., Bus, S.J.: 1992, Icarus 100, 288-294.]
[Hoffmann, M., Fink, U., Grundy, W.M.: 1992, in Observations and physical properties of small solar system bodies. eds. A. Brahic, J.-C. Gerard and J. Surdej, Universite de Liege, Institut d'Astrophysique, Liege, pp. 203-208.]
[Davies, J. K., McBride, N., Ellison, S. L., Green, S., Ballantyne, D. R.: 1998, Icarus 134, 213-227.]
[Romanishin, W., Tegler, S.C.: 1999, Nature 398, 129-132.]
[Farnham, T. L.: 2001, Icarus 152, 238-245.]
Tholen spectral type spec_T Z   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 3 color indices

5145 Pholus (1992 AD)           Discovered 1992-Jan-09 by Spacewatch at Kitt Peak
Reference: DISCOVERY.DBLast Updated: 2003--0-8-
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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