153 HILDA

'153 Hilda'

Orbital characteristics [ftp://ftp.lowell.edu/pub/elgb/astorb.html 1]
Orbit type	Main belt (Hilda)
Semimajor axis	3.973 AU
Perihelion distance	3.412 AU
Aphelion distance	4.533 AU
Orbital period	7.92 years
Inclination	7.83°
Eccentricity	0.141
Physical characteristics [ftp://ftp.lowell.edu/pub/elgb/astorb.html 1]
Diameter	170.6 km
Rotation period 3	5.11 hours
Spectral class	C
Abs. magnitude	7.48
Albedo 4	0.062
History 2
Discoverer	J. Palisa, 1875

'153 Hilda' is a very large asteroid in the outer Main belt. Because it is composed of primitive carbonaceous materials, it has a very dark surface.
Hilda gives its name to an asteroid group called Hilda asteroids (or shorter ''Hildas''). It is not an asteroid family since the members are not physically related. Instead they are asteroids locked in a 2:3 orbital resonance with Jupiter.
It was discovered by J. Palisa on November 2, 1875.
Hilda was observed to occult a star on December 31, 2002 from Japan.
It has a very low-amplitude light curve indicating a spherical body.