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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1147222364869957 5.4938e-08  
a 5.294003662172488 8.8865e-08 au
q 4.686663722077714 3.3885e-07 au
i 18.02582469073165 6.7589e-06 deg
node 332.8780198496141 1.6777e-05 deg
peri 60.61498436393256 3.4899e-05 deg
M 311.1547697381884 3.4088e-05 deg
tp 2459604.162841211284
(2022-Jan-24.66284121)
0.00042827 TDB
period 4449.126796439068
12.18
0.00011202
3.067e-07
d
yr
n .08091475394410695 2.0373e-09 deg/d
Q 5.901343602267263 9.906e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1468  
   data-arc span      30567 days (83.69 yr)  
   first obs. used      1936-08-17  
   last obs. used      2020-04-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51518  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:24:05  

Additional Information
 Earth MOID = 3.73393 au 
 Jupiter MOID = .0437748 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 9.3   n/a MPO263357  
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. 2019-August); 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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