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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 ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1429852814098354 4.0483e-08  
a 2.757070439568166 1.4183e-08 au
q 2.362849946899773 1.1588e-07 au
i 11.33416078894624 4.7774e-06 deg
node 193.9999236553919 1.9247e-05 deg
peri 76.44877549194588 2.581e-05 deg
M 336.0307977662261 1.6179e-05 deg
tp 2459507.832330103841
(2021-Oct-20.33233010)
7.5232e-05 TDB
period 1672.130696986994
4.58
1.2903e-05
3.533e-08
d
yr
n .2152941756578494 1.6613e-09 deg/d
Q 3.151290932236558 1.6211e-08 au
  Orbit Determination Parameters
   # obs. used (total)      883  
   data-arc span      8528 days (23.35 yr)  
   first obs. used      1998-03-02  
   last obs. used      2021-07-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55642  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 18:17:00  

Additional Information
 Earth MOID = 1.3788 au 
 Jupiter MOID = 2.00185 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 15.27   n/a MPO637237  
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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