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1869 Philoctetes (4596 P-L)
Classification: Jupiter Trojan          SPK-ID: 2001869
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06890050475814424 4.9508e-08  
a 5.193236246055777 8.4058e-08 au
q 4.835419647374244 3.1173e-07 au
i 3.971917305633487 3.7674e-06 deg
node 43.85398333540889 6.7302e-05 deg
peri 325.6594597155267 7.3053e-05 deg
M 343.1562458107379 2.751e-05 deg
tp 2459402.751588068639
(2021-Jul-07.25158807)
0.00032951 TDB
period 4322.704480639299
11.83
0.00010495
2.873e-07
d
yr
n .08328119620769413 2.022e-09 deg/d
Q 5.551052844737311 8.985e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1853  
   data-arc span      22032 days (60.32 yr)  
   first obs. used      1960-09-24  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49029  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:58:43  

Additional Information
 Earth MOID = 3.8344 au 
 Jupiter MOID = .0770321 au 
 T_jup = 2.990 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457272.5 (2015-Sep-07.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06546070983632933 4.9207e-08  
q 4.889506882622676 3.067e-07 au
tp 2459369.317330302700
(2021-Jun-03.81733030)
0.00035067 TDB
node 43.99783984977204 6.7142e-05 deg
peri 321.2779282565196 7.3791e-05 deg
i 3.971854750409417 3.7639e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1853  
   data-arc span      22032 days (60.32 yr)  
   first obs. used      1960-09-24  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49029  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:58:43  

Additional Information
 Jupiter MOID = .0770321 au 
 T_jup = 2.990 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.421291178002688E-15 -1.472015726447593E-14 -1.127255174980446E-12 2.638209113833246E-15 3.168462190179941E-14 -1.367517644801883E-15
q -1.472015726447593E-14 9.406203969630426E-14 -2.978986157979818E-12 -1.763027718661031E-14 -1.233234016304444E-12 1.007865097090401E-14
tp -1.127255174980446E-12 -2.978986157979818E-12 1.229695305585123E-7 -7.074651690752706E-12 1.072637297353736E-8 -5.352602023091518E-13
node 2.638209113833246E-15 -1.763027718661031E-14 -7.074651690752706E-12 4.50804343135064E-9 -4.49728799383824E-9 -8.338934620044378E-11
peri 3.168462190179941E-14 -1.233234016304444E-12 1.072637297353736E-8 -4.49728799383824E-9 5.445102881844815E-9 8.300265617019474E-11
i -1.367517644801883E-15 1.007865097090401E-14 -5.352602023091518E-13 -8.338934620044378E-11 8.300265617019474E-11 1.416712103905225E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.15   n/a E2021B10  
diameter diameter 22.655 km 3.404 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
geometric albedo albedo 0.104   0.031 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

1869 Philoctetes (4596 P-L)          Discovered 1960-Sep-24 by PLS at Palomar
These planets have all been discovered as a result of the Palomar survey of faint minor planets and subsequently identified with planets observed at other oppositions. In Sept. and Oct. 1960, T. Gehrels exposed 130 plates with the 122 cm Schmidt camera at Palomar. In the following years C. J. van Houten and I. van Houten-Groeneveld measured these plates astrometrically and photometrically at Leiden. P. Herget, Cincinnati, computed the orbits of the planets found on the NORC computer, Dahlgren, Virginia, USA.
Note: "planet" implies "minor planet"
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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