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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 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09160068852388283 4.613e-08  
a 5.256695198374093 8.5724e-08 au
q 4.775178298842837 2.6608e-07 au
i 9.336224594075491 5.0248e-06 deg
node 61.91912489158014 2.8832e-05 deg
peri 283.2423405445413 4.4953e-05 deg
M 240.3526521386491 3.9177e-05 deg
tp 2460463.580412917102
(2024-Jun-02.08041292)
0.00049984 TDB
period 4402.178218446718
12.05
0.00010768
2.948e-07
d
yr
n .08177769779775608 2.0004e-09 deg/d
Q 5.738212097905349 9.3576e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2145  
   data-arc span      11650 days (31.90 yr)  
   first obs. used      1988-09-10  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43689  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 23:20:09  

Additional Information
 Earth MOID = 3.78409 au 
 Jupiter MOID = .0143607 au 
 T_jup = 2.965 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457178.5 (2015-Jun-05.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09116369935672655 4.6414e-08  
q 4.782179286733729 2.6773e-07 au
tp 2456073.101162779196
(2012-May-25.60116278)
0.00044405 TDB
node 61.92352434097376 2.8823e-05 deg
peri 284.1974248284622 4.4954e-05 deg
i 9.335300724251747 5.0239e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2145  
   data-arc span      11650 days (31.90 yr)  
   first obs. used      1988-09-10  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43689  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 23:20:09  

Additional Information
 Jupiter MOID = .0143607 au 
 T_jup = 2.965 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.154249751588926E-15 -1.18860558698636E-14 5.229536133025188E-12 -1.57442019004361E-15 3.775710573205981E-13 1.159133869586301E-15
q -1.18860558698636E-14 7.168132978437976E-14 -1.236113320280071E-11 2.271237779514799E-14 -6.825309601362514E-13 -5.613329702235934E-15
tp 5.229536133025188E-12 -1.236113320280071E-11 1.9717912287956E-7 4.485794511630772E-11 1.537049979207819E-8 1.556842387448473E-12
node -1.57442019004361E-15 2.271237779514799E-14 4.485794511630772E-11 8.307571661209846E-10 -8.156964376296639E-10 -3.801488960249366E-11
peri 3.775710573205981E-13 -6.825309601362514E-13 1.537049979207819E-8 -8.156964376296639E-10 2.020881632112443E-9 3.762809387789174E-11
i 1.159133869586301E-15 -5.613329702235934E-15 1.556842387448473E-12 -3.801488960249366E-11 3.762809387789174E-11 2.523965452806483E-11

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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