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JPL Small-Body Database Browser
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91031 (1998 EX2)
Classification: Main-belt Asteroid          SPK-ID: 2091031
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1430388165245111 4.3394e-08  
a 2.758065374086828 2.1502e-08 au
q 2.363554967080215 1.1982e-07 au
i 11.33195222668321 5.9536e-06 deg
node 194.0033492015766 2.669e-05 deg
peri 76.29751217147243 3.5114e-05 deg
M 250.9420051367686 2.4747e-05 deg
tp 2459507.327613566612
(2021-Oct-19.82761357)
0.00011808 TDB
period 1673.035902712121
4.58
1.9565e-05
5.357e-08
d
yr
n .2151776895023066 2.5163e-09 deg/d
Q 3.15257578109344 2.4578e-08 au
  Orbit Determination Parameters
   # obs. used (total)      633  
   data-arc span      7981 days (21.85 yr)  
   first obs. used      1998-03-02  
   last obs. used      2020-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60088  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-29 14:00:12  

Additional Information
 Earth MOID = 1.37948 au 
 Jupiter MOID = 2.0022 au 
 T_jup = 3.300 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.2   n/a MPO381845  
diameter diameter 3.998 km 0.793 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.111   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91031 (1998 EX2)          Discovered 1998-Mar-02 by ODAS at Caussols
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

[ show close-approach data ]
Alternate Designations
 1998 EX2 = 1999 RT107 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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