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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1146446717329278 5.4238e-08  
a 5.291168435756704 7.6127e-08 au
q 4.684564167355748 3.3376e-07 au
i 18.02954794769856 6.5473e-06 deg
node 332.8800758312838 1.1816e-05 deg
peri 60.9380460167385 2.7971e-05 deg
M 327.0615735005393 2.4946e-05 deg
tp 2459607.248682588055
(2022-Jan-27.74868259)
0.00030965 TDB
period 4445.553151547708
12.17
9.5941e-05
2.627e-07
d
yr
n .08097979885240308 1.7477e-09 deg/d
Q 5.89777270415766 8.4855e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2028  
   data-arc span      30837 days (84.43 yr)  
   first obs. used      1936-08-17  
   last obs. used      2021-01-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45303  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:55:03  

Additional Information
 Earth MOID = 3.73109 au 
 Jupiter MOID = .0428392 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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