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9807 (1997 SJ4)
Classification: Jupiter Trojan          SPK-ID: 2009807
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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1544452706922449 5.1072e-08  
a 5.210003940383029 1.0034e-07 au
q 4.405343471502909 3.0702e-07 au
i 4.967801903297111 5.5817e-06 deg
node 232.5599045835873 6.5235e-05 deg
peri 196.9172484092922 6.9056e-05 deg
M 285.7305559481558 2.7353e-05 deg
tp 2459896.613823315916
(2022-Nov-13.11382332)
0.00034889 TDB
period 4343.656809502119
11.89
0.00012548
3.435e-07
d
yr
n .08287947593200028 2.3943e-09 deg/d
Q 6.014664409263148 1.1584e-07 au
  Orbit Determination Parameters
   # obs. used (total)      1020  
   data-arc span      11613 days (31.79 yr)  
   first obs. used      1988-01-11  
   last obs. used      2019-10-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5857  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 03:19:36  

Additional Information
 Earth MOID = 3.42003 au 
 Jupiter MOID = .429003 au 
 T_jup = 2.969 
[ 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 11.4   n/a MPO492864  
diameter diameter 24.683 km 1.787 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 346. 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:
[Ryan, E.L.; Sharkey, B.N.L.; Woodward, C.E. (2017) Astron. J. 153, A116.]
[Szabo, Gy.M.; Pal, A.; Kiss, Cs.; Kiss, L.L.; et al. (2017) Astron. Astrophys. 599, A44.]
geometric albedo albedo 0.088   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

9807 (1997 SJ4)          Discovered 1997-Sep-27 by Kobayashi, T. at Oizumi
Reference: 19981208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1997 SJ4 = 1988 AZ = 1996 RF28 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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