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1583 Antilochus (1950 SA)
Classification: Jupiter Trojan          SPK-ID: 2001583
[ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB
Reference: JPL 1 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05330229968188824 8.9556e-08  
a 5.120648732126451 1.3341e-07 AU
q 4.847706378840966 4.6826e-07 AU
i 28.53747194360955 1.0163e-05 deg
node 221.3784609908198 1.7802e-05 deg
peri 187.965853322475 8.4739e-05 deg
M 103.2312150782113 8.0464e-05 deg
tp 2455186.847254178903
(2009-Dec-21.34725418)		 0.00095269 JED
period 4232.392190332875
11.59		 0.0001654
4.528e-07		 d
yr
n .08505828000114665 3.324e-09 deg/d
Q 5.393591085411936 1.4052e-07 AU
   Orbit Determination Parameters
   # obs. used (total)      1006  
   data-arc span      31566 days (86.42 yr)  
   first obs. used      1926-11-10  
   last obs. used      2013-04-13  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      0  
   fit RMS      .59216  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Apr-29 12:45:44  

Additional Information
 Earth MOID = 3.85754 AU 
 T_jup = 2.757 
[ show covariance matrix ]

[ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.58 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17
diameter diameter 101.62 km 3.2 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17
rotation period rot_per 31.52 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List:
[Stephens, R.D. (2010) Minor Planet Bul. 37, 47-48.]
geometric albedo albedo 0.0633   0.004 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17
B-V BV .752 mag .020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=4; phase (min.=2.04, mean=5.33, max.=7.88) deg.
U-B UB .253 mag .038 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=4; phase (min.=2.04, mean=5.33, max.=7.88) deg.
Tholen spectral type spec_T D   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

1583 Antilochus (1950 SA)          Discovered 1950-Sep-19 by Arend, S. at Uccle (012)
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1950 SA = 1926 VF = 1974 WH1 
[ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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