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617 Patroclus (A906 UL)
Classification: Jupiter Trojan          SPK-ID: 2000617
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 82 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .139540030137607 6.0249e-08  
a 5.21255212746639 3.0823e-07 au
q 4.485192446505883 5.7724e-07 au
i 22.05788891773151 7.3617e-07 deg
node 44.35021854102688 1.2977e-06 deg
peri 307.9633711450854 8.6134e-06 deg
M 269.7451643903576 1.7284e-05 deg
tp 2460486.288002134681
(2024-Jun-24.78800213)
0.00029832 TDB
period 4346.843890617772
11.90
0.00038556
1.056e-06
d
yr
n .08281870917357396 7.346e-09 deg/d
Q 5.939911808426896 3.5125e-07 au
  Orbit Determination Parameters
   # obs. used (total)      2141  
   data-arc span      2723 days (7.46 yr)  
   first obs. used      2013-10-21  
   last obs. used      2021-04-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51067  
   source      ORB  
   producer      Ryan S. Park  
   solution date      2021-Apr-23 09:42:23  

Additional Information
 Earth MOID = 3.53199 au 
 Jupiter MOID = .188062 au 
 T_jup = 2.835 
[ hide covariance matrix ]
Orbital Elements at Epoch 2459343.5 (2021-May-09.0) TDB
Reference: JPL 82 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1394751648774633 6.0258e-08  
q 4.485722383045801 5.7744e-07 au
tp 2460486.237046778417
(2024-Jun-24.73704678)
0.00029825 TDB
node 44.3495507311498 1.2978e-06 deg
peri 307.9473718922942 8.6078e-06 deg
i 22.05719641611838 7.3609e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2141  
   data-arc span      2723 days (7.46 yr)  
   first obs. used      2013-10-21  
   last obs. used      2021-04-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51067  
   source      ORB  
   producer      Ryan S. Park  
   solution date      2021-Apr-23 09:42:23  

Additional Information
 Jupiter MOID = .188062 au 
 T_jup = 2.835 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.630984545789863E-15 -3.469199998996771E-14 -1.611759361836383E-11 1.81126451840763E-14 -2.900816363618766E-13 -1.300319436153495E-14
q -3.469199998996771E-14 3.334347588156461E-13 1.591899843563055E-10 -1.702190532369804E-13 3.024924210417317E-12 1.22693661909251E-13
tp -1.611759361836383E-11 1.591899843563055E-10 8.895295940257278E-8 -7.516791129606505E-11 2.205975987575586E-9 5.562041239742636E-11
node 1.81126451840763E-14 -1.702190532369804E-13 -7.516791129606505E-11 1.68417259175322E-12 -2.689982536729032E-12 -5.211294131543657E-13
peri -2.900816363618766E-13 3.024924210417317E-12 2.205975987575586E-9 -2.689982536729032E-12 7.409349864499209E-11 1.381143813611943E-12
i -1.300319436153495E-14 1.22693661909251E-13 5.562041239742636E-11 -5.211294131543657E-13 1.381143813611943E-12 5.41835617581531E-13

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.23   n/a MPO636069 IRAS observations used: 8
diameter diameter 140.362 km 0.868 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 102.8 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Marchis, F.; Hestroffer, D.; Descamps, P.; Berthier, J.; et al. (2006) Nature 439, 565-567.]
[Mueller, M.; Marchis, F.; Emery, J.P.; Harris, A.W. (DLR); et al. (2010) Icarus 205, 505-515.]
[Oey, J. (2012) Minor Planet Bull. 39, 106-107.]
[Stephens, R.D.; Warner, B.D. (2018) Minor Planet Bull. 45, 343-347.]
geometric albedo albedo 0.047   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
B-V BV 0.677   0.013 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=2.24, mean=6.14, max.=8.61) deg.
U-B UB 0.215   0.045 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=2.24, mean=6.52, max.=8.61) deg.
Tholen spectral type spec_T P   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

617 Patroclus (A906 UL)          Discovered 1906-Oct-17 by Kopff, A. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A906 UL = 1941 XC = 1962 NB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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