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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01800715716659369 5.249e-08  
a 5.235448782040117 8.8923e-08 au
q 5.141173232984269 3.0822e-07 au
i 19.67515689609236 4.0944e-06 deg
node 124.8111358698548 1.3295e-05 deg
peri 125.7826553220382 0.00013689 deg
M 12.16123728783818 0.00013257 deg
tp 2459052.689746625730
(2020-Jul-22.18974663)
0.0016133 TDB
period 4375.516236982848
11.98
0.00011148
3.052e-07
d
yr
n .08227600596181064 2.0962e-09 deg/d
Q 5.329724331095965 9.0525e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2179  
   data-arc span      23683 days (64.84 yr)  
   first obs. used      1955-12-16  
   last obs. used      2020-10-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4125  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:17:12  

Additional Information
 Earth MOID = 4.14696 au 
 Jupiter MOID = .0127273 au 
 T_jup = 2.883 
[ 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 10.76   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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