(21537) Fréchet

Asteroid (21537) Fréchet
Properties of the orbit ( animation ) Epoch: February 16, 2017 ( JD 2,457,800.5)
Orbit type	Main belt asteroid
Asteroid family	Themis family
Major semi-axis	3.0725 AU
eccentricity	0.1398
Perihelion - aphelion	2.6428 AU - 3.5022 AU
Inclination of the orbit plane	1.1738 °
Length of the ascending node	160.8843 °
Argument of the periapsis	79.4040 °
Sidereal period	5.39 a
Mean orbital velocity	16.97 km / s
Physical Properties
Absolute brightness	14.2 mag
history
Explorer	Paul G. Comba
Date of discovery	August 15, 1998
Another name	1998 PQ , 1996 DR ₃
Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items.

(21537) Fréchet is an asteroid of the main belt , which on 15 August 1998 by the American Italo- astronomer Paul G. Comba at Prescott Observatory ( IAU code in 684) Arizona was discovered.

(21537) Fréchet belongs to the Themis family, a group of asteroids named after (24) Themis .

The asteroid was named on May 9, 2001 after the French mathematician Maurice René Fréchet (1878–1973), who wrote fundamental works in functional analysis and used several mathematical terms such as the Fréchet derivative , the Fréchet space and the Fréchet- Distribution are named.

Individual evidence