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221908 Agastrophus (2008 QQ)
Classification: Jupiter Trojan          SPK-ID: 2221908
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 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0657029163616653 6.6483e-08  
a 5.105124606578133 1.4184e-07 au
q 4.769703031536251 4.3583e-07 au
i 7.346668125280678 4.4973e-06 deg
node 271.8219770339084 6.4739e-05 deg
peri 142.1003702402316 8.6309e-05 deg
M 320.5250172289738 5.7842e-05 deg
tp 2459662.484490122955
(2022-Mar-23.98449012)
0.00068094 TDB
period 4213.159950163042
11.54
0.00017558
4.807e-07
d
yr
n .08544655419172222 3.561e-09 deg/d
Q 5.440546181620016 1.5116e-07 au
  Orbit Determination Parameters
   # obs. used (total)      459  
   data-arc span      8527 days (23.35 yr)  
   first obs. used      1997-10-06  
   last obs. used      2021-02-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49785  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 00:17:25  

Additional Information
 Earth MOID = 3.78441 au 
 Jupiter MOID = .115663 au 
 T_jup = 2.980 
[ 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 12.88   n/a E2021B55  

221908 Agastrophus           Discovered 2008 Aug. 21 by P. Kocher at the Observatoire Naef.
In Homer's Iliad, Agastrophus was a Paionian hero, famed for his spear, who fought with the Trojans in the Trojan War and who was killed by Diomedes. Agastrophus was the son of Paeon and brother of Laophoon.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20111210/MPCPages.arcLast Updated: 2011-12-12
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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