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4902 Thessandrus (1989 AN2)
Classification: Jupiter Trojan          SPK-ID: 2004902
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04332448648944147 3.9227e-08  
a 5.203037819198357 7.562e-08 au
q 4.977618877496445 2.5556e-07 au
i 9.075236621543027 5.6429e-06 deg
node 170.2780829604417 2.1501e-05 deg
peri 270.3682117187112 7.2297e-05 deg
M 287.6935364791706 7.0726e-05 deg
tp 2460071.179904536559
(2023-May-06.67990454)
0.00085697 TDB
period 4334.948085835607
11.87
9.4505e-05
2.587e-07
d
yr
n .08304597722318655 1.8105e-09 deg/d
Q 5.42845676090027 7.8896e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2547  
   data-arc span      24458 days (66.96 yr)  
   first obs. used      1954-02-26  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46167  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 16:55:28  

Additional Information
 Earth MOID = 4.00826 au 
 Jupiter MOID = .197381 au 
 T_jup = 2.973 
[ 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 9.91   n/a E2021B10  
diameter diameter 51.263 km 0.664 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 738. h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[French, L.M.; Stephens, R.D.; Coley, D.R.; Wasserman, L.H.; et al. (2013) Minor Planet Bull. 40, 198-203.]
geometric albedo albedo 0.081   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

4902 Thessandrus (1989 AN2)          Discovered 1989-Jan-09 by Shoemaker, C. S. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1989 AN2 = 1985 TK3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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