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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09190679404573796 2.6741e-08  
a 5.255518675324283 7.8799e-08 au
q 4.772500802827724 1.6389e-07 au
i 9.337272791441972 2.0944e-06 deg
node 61.91702143962644 8.2752e-06 deg
peri 283.3232099335213 2.075e-05 deg
M 256.6574364872361 2.4635e-05 deg
tp 2460463.776833853375
(2024-Jun-02.27683385)
0.00031874 TDB
period 4400.700396125212
12.05
9.8973e-05
2.71e-07
d
yr
n .08180515999611736 1.8398e-09 deg/d
Q 5.738536547820841 8.6041e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2222  
   data-arc span      11865 days (32.48 yr)  
   first obs. used      1988-09-10  
   last obs. used      2021-03-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43392  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 16:47:02  

Additional Information
 Earth MOID = 3.77966 au 
 Jupiter MOID = .0155777 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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