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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 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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457297.5 (2015-Oct-02.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09103504483977848 2.6615e-08  
q 4.782851004961765 1.6208e-07 au
tp 2456072.818310135764
(2012-May-25.31831014)
0.00026676 TDB
node 61.92290888966721 8.2733e-06 deg
peri 284.1897394876701 2.0851e-05 deg
i 9.335123699228335 2.0943e-06 deg
  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
 Jupiter MOID = .0155777 au 
 T_jup = 2.965 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.08344543318461E-16 -3.858256185718065E-15 2.048940747162026E-12 3.9874229996937E-15 8.115854259024261E-14 -1.864331197299061E-15
q -3.858256185718065E-15 2.626948312488131E-14 -2.924702225373056E-12 6.171667935721479E-15 3.24689011369465E-13 1.413601556553562E-14
tp 2.048940747162026E-12 -2.924702225373056E-12 7.115989607368553E-8 5.125813856007193E-10 5.046341619058539E-9 3.200415795558677E-11
node 3.9874229996937E-15 6.171667935721479E-15 5.125813856007193E-10 6.844794848358666E-11 -2.803954403406164E-11 1.445470429894363E-11
peri 8.115854259024261E-14 3.24689011369465E-13 5.046341619058539E-9 -2.803954403406164E-11 4.347678897885436E-10 -1.184303881660013E-11
i -1.864331197299061E-15 1.413601556553562E-14 3.200415795558677E-11 1.445470429894363E-11 -1.184303881660013E-11 4.386101045556211E-12

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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