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42491 (1991 TF)
Classification: Main-belt Asteroid          SPK-ID: 2042491
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2614992431061948 8.3913e-08  
a 2.647966005492563 2.6368e-08 AU
q 1.955524899285324 2.1814e-07 AU
i 14.62781615288064 9.7529e-06 deg
node 173.3195880714958 3.0214e-05 deg
peri 199.5308555170834 3.4485e-05 deg
M 136.402916760749 2.0805e-05 deg
tp 2456404.167895059471
(2013-Apr-21.66789506)
8.5302e-05 JED
period 1573.863395862265
4.31
2.3509e-05
6.436e-08
d
yr
n .2287364970469807 3.4166e-09 deg/d
Q 3.340407111699802 3.3264e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      383  
   data-arc span      22912 days (62.73 yr)  
   first obs. used      1952-08-24  
   last obs. used      2015-05-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5802  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 17:29:40  

Additional Information
 Earth MOID = .960279 AU 
 T_jup = 3.297 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.8 mag n/a MPO337599  

42491 (1991 TF)          Discovered 1991-Oct-01 by McNaught, R. H. at Siding Spring
Reference: 20020624/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 TF = 2002 EM147 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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