P-type (primitive-type) asteroids have low albedo and a featureless reddish spectrum. It has been suggested that they have a composition of organic-rich silicates, carbon and anhydrous silicates, possibly with water ice in their interior. P-type asteroids are found in the outer asteroid belt and beyond. There are about 33 known P-type asteroids, depending on the classification, including 46 Hestia, 65 Cybele, 76 Freia, 87 Sylvia, 153 Hilda, 476 Hedwig and, in some classifications, 107 Camilla.
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In this Dossier
P-type asteroid in the context of Hilda family
The Hilda family (001) is an ancient collisional asteroid family of at least 409 known asteroids, named for its largest member, the 170-kilometre (110 mi)-across asteroid 153 Hilda. It lies within the larger dynamical group of Hilda asteroids, a group of asteroids in the 3:2 orbital resonance with Jupiter. All members of the family are dark P-type asteroids with albedos of around 0.06. Another asteroid family in the Hilda dynamical group is the Schubart family, named for its largest member, 1911 Schubart.
An asteroid family is a group of physically related asteroids usually created by a collision with an original larger asteroid, with the fragments continuing on similar orbits to the original. This is distinct from a dynamical group in that the members of a dynamical group only share similar orbits because of gravitational interactions with planets, which concentrate asteroids in a particular orbital range. Members of the Hilda family are both part of the wider Hilda dynamical group, and fragments of 153 Hilda. The family is considered a non-catastrophic asteroid family because 153 Hilda, its largest member, makes up nearly 3/4 of the family's total mass, rather than simply being the largest of a number of fragments each making up a small fraction of the original destroyed asteroid.
P-type asteroid in the context of 153 Hilda
153 Hilda is a large asteroid in the outer main belt, with a diameter of 170 km. The spectrum matches that of a P-type asteroid. It was discovered by Johann Palisa on 2 November 1875, from the Austrian Naval Observatory at Pula, now Croatia. The name was chosen by the astronomer Theodor von Oppolzer, who named it after one of his daughters. It is the largest member of the Hilda family, a collisional family of asteroids in the Hilda region.
P-type asteroid in the context of Schubart family
The Schubart family (002) is a collisional asteroid family of at least 353 known asteroids, named for its largest member, the 67-kilometre (42 mi)-across asteroid 1911 Schubart. It lies within the larger dynamical group of Hilda asteroids, a group of asteroids in the 3:2 orbital resonance with Jupiter. Like its namesake, it's named after the largest member, 1911 Schubart. All members of the family are dark P-type asteroids with albedos of around 0.04. Another asteroid family in the Hilda dynamical group is the Hilda family, named for its largest member, 153 Hilda.
An asteroid family is a group of physically related asteroids usually created by a collision with an original larger asteroid, with the fragments continuing on similar orbits to the original. This is distinct from a dynamical group in that the members of a dynamical group only share similar orbits because of gravitational interactions with planets, which concentrate asteroids in a particular orbital range. Members of the Schubart family are both part of the wider Hilda dynamical group, and fragments of a single original asteroid. The family is considered a catastrophic asteroid family because even its largest member, 1911 Schubart, does not make up a majority of the family's mass.