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39797 (1997 TK18)
Classification: Jupiter Trojan          SPK-ID: 2039797
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08109097778070226 7.2343e-08  
a 5.171617560678382 1.2748e-07 au
q 4.752246035975122 3.6231e-07 au
i 14.98037213217844 7.4957e-06 deg
node 27.22754993438168 2.3365e-05 deg
peri 125.5128147194863 4.8737e-05 deg
M 197.9459446065487 4.4306e-05 deg
tp 2460934.228205858070
(2025-Sep-15.72820586)
0.00057087 TDB
period 4295.740408462722
11.76
0.00015884
4.349e-07
d
yr
n .08380394664695996 3.0987e-09 deg/d
Q 5.590989085381643 1.3782e-07 au
  Orbit Determination Parameters
   # obs. used (total)      410  
   data-arc span      10420 days (28.53 yr)  
   first obs. used      1991-03-15  
   last obs. used      2019-09-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .59556  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 05:49:08  

Additional Information
 Earth MOID = 3.7864 au 
 Jupiter MOID = .443126 au 
 T_jup = 2.926 
[ 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 12.2   n/a MPO452720  
rotation period rot_per 7.661 h n/a LCDB (Rev. 2019-August); 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

39797 (1997 TK18)          Discovered 1997-Oct-03 by BAO Schmidt CCD Asteroid Program at Xinglong
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1997 TK18 = 1999 XB208 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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