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21537 Frechet (1998 PQ)
Classification: Main-belt Asteroid          SPK-ID: 2021537
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1399562863430322 3.4521e-08  
a 3.071904082099235 1.7397e-08 au
q 2.641971794766625 1.0457e-07 au
i 1.174264709646373 5.1575e-06 deg
node 160.8311798209398 0.00017095 deg
peri 78.54711697222567 0.00017192 deg
M 168.827138889398 1.9444e-05 deg
tp 2458474.247877855895
(2018-Dec-21.74787786)
0.00010366 TDB
period 1966.572235695972
5.38
1.6705e-05
4.574e-08
d
yr
n .1830596372030014 1.555e-09 deg/d
Q 3.501836369431845 1.9831e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1240  
   data-arc span      10008 days (27.40 yr)  
   first obs. used      1993-09-18  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54421  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:47:40  

Additional Information
 Earth MOID = 1.63036 au 
 Jupiter MOID = 1.50315 au 
 T_jup = 3.215 
[ 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 14.2   n/a MPO309322  

21537 Fréchet           Discovered 1998 Aug. 15 by P. G. Comba at Prescott.
Maurice Fréchet (1878-1973), a student of Hadamard and graduate of the École Normale Supérieure, was a pioneer in the study of the point set topology of abstract spaces and of functionals defined thereon. He introduced, among others, the concepts of compactness, completeness and separability.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010509/MPCPages.arcLast Updated: 2016-11-23

[ show close-approach data ]
Alternate Designations
 1998 PQ = 1996 DR3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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