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18054 (1999 SW7)
Classification: Jupiter Trojan          SPK-ID: 2018054
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01853027103069229 5.1428e-08  
a 5.239189985239373 8.7087e-08 au
q 5.142106374831599 3.0011e-07 au
i 19.67410826528038 4.0189e-06 deg
node 124.8129786428198 1.3093e-05 deg
peri 127.7429349976917 0.00013104 deg
M 26.36349539070304 0.00012656 deg
tp 2459075.728970897479
(2020-Aug-14.22897090)
0.0015444 TDB
period 4380.20712980382
11.99
0.00010921
2.99e-07
d
yr
n .08218789416383687 2.0492e-09 deg/d
Q 5.336273595647148 8.8701e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2285  
   data-arc span      23950 days (65.57 yr)  
   first obs. used      1955-12-16  
   last obs. used      2021-07-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40673  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:29:51  

Additional Information
 Earth MOID = 4.14823 au 
 Jupiter MOID = .00439591 au 
 T_jup = 2.883 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457637.5 (2016-Sep-06.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01451513787851139 5.0745e-08  
q 5.143468918351855 2.9772e-07 au
tp 2459059.795520974023
(2020-Jul-29.29552097)
0.0019845 TDB
node 124.870107930673 1.311e-05 deg
peri 126.1943993409296 0.00016802 deg
i 19.6829890430352 4.0196e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2285  
   data-arc span      23950 days (65.57 yr)  
   first obs. used      1955-12-16  
   last obs. used      2021-07-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40673  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:29:51  

Additional Information
 Jupiter MOID = .00439591 au 
 T_jup = 2.883 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.57509755036675E-15 -1.446962924297749E-14 2.618911045085488E-11 -5.771144048064494E-15 2.326052466409937E-12 -4.206802121815222E-15
q -1.446962924297749E-14 8.863766493078507E-14 -2.311319148631996E-10 5.404892668772418E-14 -2.031693628527437E-11 2.129613614233381E-14
tp 2.618911045085488E-11 -2.311319148631996E-10 3.938065055513911E-6 -2.962963600956059E-10 3.324144365285952E-7 4.426415336159038E-12
node -5.771144048064494E-15 5.404892668772418E-14 -2.962963600956059E-10 1.718654487197192E-10 -1.872382366402428E-10 -1.06355810626114E-11
peri 2.326052466409937E-12 -2.031693628527437E-11 3.324144365285952E-7 -1.872382366402428E-10 2.823189450756478E-8 1.018564445373636E-11
i -4.206802121815222E-15 2.129613614233381E-14 4.426415336159038E-12 -1.06355810626114E-11 1.018564445373636E-11 1.615691083614087E-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 10.76   n/a E2021B10  
diameter diameter 36.222 km 0.408 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
geometric albedo albedo 0.071   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

18054 (1999 SW7)          Discovered 1999-Sep-29 by LINEAR at Socorro
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 SW7 = 1991 XT2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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