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4792 Lykaon (1988 RK1)
Classification: Jupiter Trojan          SPK-ID: 2004792
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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09160069540290354 4.7054e-08  
a 5.256695205074605 8.6244e-08 au
q 4.775178268768663 2.691e-07 au
i 9.336224410071841 5.0311e-06 deg
node 61.91911963529963 2.9597e-05 deg
peri 283.2423467743004 4.5431e-05 deg
M 240.3526501320403 3.9276e-05 deg
tp 2460463.580440251862
(2024-Jun-02.08044025)
0.00050128 TDB
period 4402.178226863655
12.05
0.00010834
2.966e-07
d
yr
n .08177769764139765 2.0125e-09 deg/d
Q 5.738212141380548 9.4144e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2057  
   data-arc span      11602 days (31.76 yr)  
   first obs. used      1988-09-10  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44025  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 16:13:33  

Additional Information
 Earth MOID = 3.78409 au 
 Jupiter MOID = .0143607 au 
 T_jup = 2.965 
[ 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 10.1   n/a MPO319144  
diameter diameter 50.870 km 0.699 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 40.09 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:
[Mottola, S.; Di Martino, M.; Erikson, A.; Gonano-Beurer, M.; et al. (2011) Astron. J. 141, A170.]
geometric albedo albedo 0.068   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

4792 Lykaon (1988 RK1)          Discovered 1988-Sep-10 by Shoemaker, C. S. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1988 RK1 = 1989 UN9 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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