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1404 Ajax (1936 QW)
Classification: Jupiter Trojan          SPK-ID: 2001404
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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1144363343235902 3.9477e-08  
a 5.288728696079111 7.064e-08 au
q 4.683505970867836 2.521e-07 au
i 18.03080452022333 1.9608e-06 deg
node 332.8822074257156 7.5645e-06 deg
peri 61.19747028347712 1.2028e-05 deg
M 342.7156900600124 1.3603e-05 deg
tp 2459609.792166177056
(2022-Jan-30.29216618)
0.00016916 TDB
period 4442.478761972206
12.16
8.9006e-05
2.437e-07
d
yr
n .08103584041450333 1.6236e-09 deg/d
Q 5.893951421290384 7.8724e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2095  
   data-arc span      31000 days (84.87 yr)  
   first obs. used      1936-08-17  
   last obs. used      2021-07-02  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44876  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 13:20:20  

Additional Information
 Earth MOID = 3.73087 au 
 Jupiter MOID = .0419711 au 
 T_jup = 2.889 
[ 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 9.41   n/a E2021B10  
diameter diameter 83.990 km 1.279 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 29.38 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Binzel, R.P.; Sauter, L.M. (1992) Icarus 95, 222-238.]
[French, L.M.; Stephens, R.D.; Lederer, S.M.; Coley, D.R.; Rohl, D.A. (2011) Minor Planet Bull. 38, 116-120.]
geometric albedo albedo 0.048   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

1404 Ajax (1936 QW)          Discovered 1936-Aug-17 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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