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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0919067978330036 4.608e-08  
a 5.255518676177513 8.5341e-08 au
q 4.772500783698491 2.6593e-07 au
i 9.337275573630722 5.0254e-06 deg
node 61.91700808917879 2.8771e-05 deg
peri 283.3232282926643 4.4835e-05 deg
M 256.6574317596529 3.9285e-05 deg
tp 2460463.776891951783
(2024-Jun-02.27689195)
0.00049815 TDB
period 4400.700397196887
12.05
0.00010719
2.935e-07
d
yr
n .08180515997619586 1.9926e-09 deg/d
Q 5.738536568656533 9.3185e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2160  
   data-arc span      11810 days (32.33 yr)  
   first obs. used      1988-09-10  
   last obs. used      2021-01-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43621  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 19:06:56  

Additional Information
 Earth MOID = 3.77966 au 
 Jupiter MOID = .0155775 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 10.22   n/a E2021B10  
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. 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:
[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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