Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
1869 Philoctetes (4596 P-L)
Classification: Jupiter Trojan          SPK-ID: 2001869
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ hide orbit diagram ]

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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0689005033217478 4.9482e-08  
a 5.193236248691054 8.4054e-08 au
q 4.835419657287495 3.116e-07 au
i 3.971917350668843 3.7641e-06 deg
node 43.85398298289659 6.7281e-05 deg
peri 325.6594597718311 7.3034e-05 deg
M 343.1562460017806 2.751e-05 deg
tp 2459402.751585928640
(2021-Jul-07.25158593)
0.0003295 TDB
period 4322.704483929595
11.83
0.00010495
2.873e-07
d
yr
n .08328119614430331 2.0219e-09 deg/d
Q 5.551052840094613 8.9845e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1857  
   data-arc span      22032 days (60.32 yr)  
   first obs. used      1960-09-24  
   last obs. used      2021-01-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48985  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:03:23  

Additional Information
 Earth MOID = 3.8344 au 
 Jupiter MOID = .077032 au 
 T_jup = 2.990 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457273.5 (2015-Sep-08.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06546490022325065 4.9182e-08  
q 4.889466710495613 3.0657e-07 au
tp 2459369.287727482939
(2021-Jun-03.78772748)
0.00035065 TDB
node 43.99776918507071 6.7121e-05 deg
peri 321.2767566847745 7.3771e-05 deg
i 3.971862489172862 3.7607e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1857  
   data-arc span      22032 days (60.32 yr)  
   first obs. used      1960-09-24  
   last obs. used      2021-01-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48985  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:03:23  

Additional Information
 Jupiter MOID = .077032 au 
 T_jup = 2.990 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.4188556316069E-15 -1.47066054071435E-14 -1.130059145453866E-12 2.623142665389766E-15 3.152242658057125E-14 -1.365992810494048E-15
q -1.47066054071435E-14 9.398612268325669E-14 -2.961594887768774E-12 -1.748352660282218E-14 -1.232200035442158E-12 1.006742444547351E-14
tp -1.130059145453866E-12 -2.961594887768774E-12 1.229529823895072E-7 -7.130080655386782E-12 1.072508067161493E-8 -5.267120667598663E-13
node 2.623142665389766E-15 -1.748352660282218E-14 -7.130080655386782E-12 4.505198092978194E-9 -4.494457768543479E-9 -8.312648531735632E-11
peri 3.152242658057125E-14 -1.232200035442158E-12 1.072508067161493E-8 -4.494457768543479E-9 5.442173220903296E-9 8.2741266592036E-11
i -1.365992810494048E-15 1.006742444547351E-14 -5.267120667598663E-13 -8.312648531735632E-11 8.2741266592036E-11 1.414269418641936E-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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-20 18:57 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin