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JPL Small-Body Database Browser
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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 ]

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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.

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06930812408561551 4.9637e-08  
a 5.196826769564038 9.1078e-08 au
q 4.836644454967646 3.1426e-07 au
i 3.971242224769004 4.6192e-06 deg
node 43.8734229115629 7.0123e-05 deg
peri 325.1017736372648 7.8456e-05 deg
M 327.0038244211768 3.7141e-05 deg
tp 2459397.112951877301
0.00044787 TDB
period 4327.188232307267
n .08319490178684627 2.1871e-09 deg/d
Q 5.55700908416043 9.739e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1335  
   data-arc span      21586 days (59.10 yr)  
   first obs. used      1960-09-24  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5365  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 02:09:34  

Additional Information
 Earth MOID = 3.83701 au 
 Jupiter MOID = .082671 au 
 T_jup = 2.990 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.1   n/a MPO416726  
diameter diameter 22.655 km 3.404 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (  
geometric albedo albedo 0.104   0.031 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (  

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 ]
FirstGov 2020-May-28 18:21 UT
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