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JPL Small-Body Database Browser
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42555 (1996 RU31)
Classification: Jupiter Trojan          SPK-ID: 2042555
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1130319766063001 9.5167e-08  
a 5.239477520412398 1.4958e-07 au
q 4.647249019895908 5.7988e-07 au
i 6.437562844268846 7.8632e-06 deg
node 165.2799894697239 4.9981e-05 deg
peri 186.9929016415888 5.5903e-05 deg
M 330.4931835236104 2.442e-05 deg
tp 2458959.546133037695
(2020-Apr-20.04613304)
0.00029666 TDB
period 4380.567723969717
11.99
0.00018759
5.136e-07
d
yr
n .08218112872222967 3.5192e-09 deg/d
Q 5.831706020928888 1.6649e-07 au
  Orbit Determination Parameters
   # obs. used (total)      446  
   data-arc span      10078 days (27.59 yr)  
   first obs. used      1992-05-03  
   last obs. used      2019-12-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58033  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 03:25:41  

Additional Information
 Earth MOID = 3.64102 au 
 Jupiter MOID = .307985 au 
 T_jup = 2.975 
[ 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 12.5   n/a MPO493145  
diameter diameter 17.909 km 0.597 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)  
geometric albedo albedo 0.060   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)  

42555 (1996 RU31)          Discovered 1996-Sep-13 by Uppsala-DLR Trojan Survey at La Silla
Reference: 20020624/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1996 RU31 = 2002 EJ4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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