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

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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5692573039301972 6.3621e-07  
a 20.37593913319939 4.7301e-05 au
q 8.776786957188506 8.8632e-06 au
i 24.61270269838907 1.3258e-05 deg
node 119.445311194686 2.9692e-05 deg
peri 354.9191486915832 0.00012926 deg
M 112.7149033393026 0.00041837 deg
tp 2448482.002186876673
(1991-Aug-13.50218688)
0.0024714 TDB
period 33595.01805476
91.98
0.11698
0.0003203
d
yr
n .0107158745803678 3.7314e-08 deg/d
Q 31.97509130921028 7.4227e-05 au
  Orbit Determination Parameters
   # obs. used (total)      392  
   data-arc span      14881 days (40.74 yr)  
   first obs. used      1977-07-22  
   last obs. used      2018-04-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      1  
   norm. resid. RMS      .54502  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:45:49  

Additional Information
 Earth MOID = 7.79392 au 
 Jupiter MOID = 3.51717 au 
 T_jup = 3.214 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455372.5 (2010-Jun-25.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5718535621627574 6.2898e-07  
q 8.693351877862698 8.8116e-06 au
tp 2448510.941595222725
(1991-Sep-11.44159522)
0.0023731 TDB
node 119.409556553733 2.968e-05 deg
peri 354.7054649858967 0.00012833 deg
i 24.66721199817665 1.3307e-05 deg
  Orbit Determination Parameters
   # obs. used (total)      392  
   data-arc span      14881 days (40.74 yr)  
   first obs. used      1977-07-22  
   last obs. used      2018-04-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      1  
   norm. resid. RMS      .54502  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:45:49  

Additional Information
 Jupiter MOID = 3.51717 au 
 T_jup = 3.214 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.956157814961684E-13 4.054154913845378E-12 1.405650360112837E-9 2.536469868858147E-13 7.167706426802074E-11 2.00967083624678E-13
q 4.054154913845378E-12 7.764404896040681E-11 1.801089243026904E-8 1.790612153373455E-12 1.045839553610671E-9 2.905040075652421E-12
tp 1.405650360112837E-9 1.801089243026904E-8 5.631574167711622E-6 8.584568755785985E-10 2.887529455032446E-7 7.649610056735418E-10
node 2.536469868858147E-13 1.790612153373455E-12 8.584568755785985E-10 8.809166184378294E-10 -7.608403128437774E-10 -2.855094676311797E-10
peri 7.167706426802074E-11 1.045839553610671E-9 2.887529455032446E-7 -7.608403128437774E-10 1.646950696373872E-8 3.028346031108471E-10
i 2.00967083624678E-13 2.905040075652421E-12 7.649610056735418E-10 -2.855094676311797E-10 3.028346031108471E-10 1.770753909996608E-10

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.1   n/a MPO169571  
diameter diameter 190 km 26 Earth, Moon, and Planets, v. 89, Issue 1, p. 117-134 (2002)  
rotation period rot_per 9.980 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 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. A. Brahic, J.-C. Gerard, J. Surdej, eds. Universite de Liege, Institut d'Astrophysique, Liege, pp. 203-208.]
[Farnham, T.L. (2001) Icarus 152, 238-245.]
[Tegler, S.C.; Romanishin, W.; Consolmagno, G.J.; Rall, J.; et al. (2005) Icarus 175, 390-396.]
geometric albedo albedo 0.044   0.013 Earth, Moon, and Planets, v. 89, Issue 1, p. 117-134 (2002)  
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: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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