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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 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1146447518053788 3.9881e-08  
a 5.291168380842654 7.1788e-08 au
q 4.68456369506048 2.5524e-07 au
i 18.02954660034046 1.9624e-06 deg
node 332.8800812889296 7.5749e-06 deg
peri 60.93802546402937 1.2104e-05 deg
M 327.0615926763036 1.376e-05 deg
tp 2459607.248439459049
(2022-Jan-27.74843946)
0.00017257 TDB
period 4445.553082340878
12.17
9.0472e-05
2.477e-07
d
yr
n .08097980011306853 1.648e-09 deg/d
Q 5.897773066624828 8.0018e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2064  
   data-arc span      30855 days (84.48 yr)  
   first obs. used      1936-08-17  
   last obs. used      2021-02-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45152  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:24:15  

Additional Information
 Earth MOID = 3.73109 au 
 Jupiter MOID = .0428397 au 
 T_jup = 2.889 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457208.5 (2015-Jul-05.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1126820618090643 3.9953e-08  
q 4.706313190459453 2.5462e-07 au
tp 2455146.371533821888
(2009-Nov-10.87153382)
0.00016633 TDB
node 332.9792348248238 7.5655e-06 deg
peri 60.24339302087191 1.2087e-05 deg
i 18.00451389816189 1.9658e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2064  
   data-arc span      30855 days (84.48 yr)  
   first obs. used      1936-08-17  
   last obs. used      2021-02-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45152  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:24:15  

Additional Information
 Jupiter MOID = .0428397 au 
 T_jup = 2.889 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.596251414692984E-15 -9.964819562926285E-15 -1.756107502580705E-12 -1.201203303873977E-13 -7.913356416774371E-14 -3.057248219030884E-14
q -9.964819562926285E-15 6.483066718392336E-14 7.35073656233891E-12 7.170687396132808E-13 4.068465402485333E-13 1.813980672530967E-13
tp -1.756107502580705E-12 7.35073656233891E-12 2.766691101867118E-8 1.607449572189727E-10 1.603022895241872E-9 4.731244722427109E-11
node -1.201203303873977E-13 7.170687396132808E-13 1.607449572189727E-10 5.723754539353192E-11 -4.025899218701531E-11 1.376247354739823E-11
peri -7.913356416774371E-14 4.068465402485333E-13 1.603022895241872E-9 -4.025899218701531E-11 1.460970238539965E-10 -8.958648278690179E-12
i -3.057248219030884E-14 1.813980672530967E-13 4.731244722427109E-11 1.376247354739823E-11 -8.958648278690179E-12 3.864464442411939E-12

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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