457 Alleghenia, provisional designation 1900 FJ, is a carbonaceous
asteroid from the outer region of the
asteroid belt, about 34 kilometers in diameter. It was discovered on 15 September 1900, by German astronomers
Max Wolf and
Friedrich Schwassmann at
Heidelberg Observatory in southern Germany.
C-type asteroid orbits the Sun at a distance of 2.6–3.6
AU once every 5 years and 5 months (1,987 days). Its orbit is
tilted by 13 degrees to the plane of the
ecliptic and shows an
eccentricity of 0.17. Based on assumptions made by the Collaborative Asteroid Lightcurve Link, the body has a low
albedo of 0.06, a typical value for a carbonaceous asteroid.
 In 2014, photometric
light-curve observations at the Los Algarrobos Observatory (OLASU,
I38), Uruguay, has given a
rotation period of ±0.001 hours with a brightness amplitude of 0.20 in
21.953magnitude. It was the last among the first 500 numbered asteroids to have its period measured for the first time (also see
The minor planet was named by Max Wolf in honor and gratitude of U.S. optician
John Brashear at
Allegheny in Pennsylvania, who equipped Wolf's new telescope with state of the art optics (lenses for the 16-inch photographic doublet). Some of the finest astronomy equipment of the early 20th century were produced at Allegheny by Brashear. The body was the first discovery Wolf made with his new instrument.
[a] Wolf also expressed his gratitude by granting the naming of another of his discoveries to the American optician, who named it
484 Pittsburghia, after his home city. Brashear is also honored by
a Martian and
a lunar crater.
 The minor planet
5502 Brashear was later directly named after the famous American astronomer and instrument builder.