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JPL Small-Body Database Browser
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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1143732313726313 5.5183e-08  
a 5.299027767893659 8.9806e-08 au
q 4.692960838946359 3.3966e-07 au
i 18.01401459898423 6.756e-06 deg
node 332.8905205187173 1.6808e-05 deg
peri 60.0299649291679 3.487e-05 deg
M 279.3080319096744 3.3714e-05 deg
tp 2459599.166604259452
(2022-Jan-19.66660426)		 0.0004286 TDB
period 4455.461752165472
12.20		 0.00011326
3.101e-07		 d
yr
n .08079970607424258 2.0541e-09 deg/d
Q 5.905094696840958 1.0008e-07 au
   Orbit Determination Parameters
   # obs. used (total)      1461  
   data-arc span      30424 days (83.30 yr)  
   first obs. used      1936-08-17  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51433  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:59:27  

Additional Information
 Earth MOID = 3.73869 au 
 Jupiter MOID = .0443424 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-January); 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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