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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1130989495535666 6.9543e-08  
a 5.239152683608593 1.1291e-07 au
q 4.646610018541711 3.9288e-07 au
i 6.437837547375818 7.6255e-06 deg
node 165.278885873987 4.0868e-05 deg
peri 187.2432453453005 4.7877e-05 deg
M 3.170294874590245 2.1776e-05 deg
tp 2458961.926666914546
(2020-Apr-22.42666691)
0.0002655 TDB
period 4380.160351033035
11.99
0.00014159
3.877e-07
d
yr
n .08218877190537012 2.6568e-09 deg/d
Q 5.831695348675474 1.2568e-07 au
  Orbit Determination Parameters
   # obs. used (total)      622  
   data-arc span      10399 days (28.47 yr)  
   first obs. used      1992-05-03  
   last obs. used      2020-10-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52581  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 00:06:32  

Additional Information
 Earth MOID = 3.64136 au 
 Jupiter MOID = .307786 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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