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Pallas family

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Asteroid family

ThePallas family (adj. Palladian;FIN:801) is a smallasteroid family ofB-type asteroids at very highinclinations in the intermediateasteroid belt.^[1]^[2] The family was identified byKiyotsugu Hirayama in 1928.

The namesake of the family is2 Pallas, an extremely large asteroid with amean diameter of about 512 km.^[3] The remaining Palladian asteroids are far smaller; the largest is5222 Ioffe with an estimated diameter of 22 km. This, along with the preponderance of the otherwise rare B spectral type among its members, indicates that this is likely acratering family composed of ejecta from impacts on Pallas.

Another suspected Palladian is3200 Phaethon, the parent body of theGeminid meteor shower.^[4]

Location and structure of the Pallas family.

From the diagram, theirproper orbital elements lie in the approximate ranges

	a_p	e_p	i_p
min	2.71AU	0.25	32°
max	2.79 AU	0.31	34°

At the presentepoch, the range ofosculating orbital elements of the members (by comparison to the MPCORB database[1]) is about

	a	e	i
min	2.71AU	0.13	30°
max	2.79 AU	0.37	38°

References

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^Cellino, A.; Bus, S. J.; Doressoundiram, A.; Lazzaro, D. (March 2002)."Spectroscopic Properties of Asteroid Families".Asteroids III:633–643.Bibcode:2002aste.book..633C. Retrieved14 December 2018. (see Table on p.636)
^Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families".Asteroids IV. pp. 297–321.arXiv:1502.01628.Bibcode:2015aste.book..297N.doi:10.2458/azu_uapress_9780816532131-ch016.ISBN 9780816532131.
^Carry, Benoît; Dumas, Christophe; Kaasalainen, Mikko; Berthier, Jérôme; Merline, William J.; Erard, Stéphane; et al. (February 2010). "Physical properties of (2) Pallas".Icarus.205 (2):460–472.arXiv:0912.3626.Bibcode:2010Icar..205..460C.doi:10.1016/j.icarus.2009.08.007.
^Jaggard, Victoria (12 October 2010)."Exploding Clays Drive Geminids Sky Show?". National Geographic. Retrieved14 December 2018.

A. Lemaitre & A. Morbidelli,Proper elements for highly inclined asteroidal orbits, Celestial Mechanics and Dynamical Astronomy, Vol. 60, pp. 29 (1994).
Y. KozaiSecular perturbations of asteroids and comets In: Dynamics of the solar system; Proceedings of the Symposium, Tokyo, Japan, May 23–26, 1978. Dordrecht, D. Reidel Publishing Co., 1979, p. 231-236; Discussion, p. 236, 237.

Small Solar System bodies

Minor planets

Designation Groups List Moon Meanings of names
Asteroid	Active Aten asteroid Asteroid belt Family Jupiter trojan Near-Earth Spectral types
Distant minor planet	Centaur Neptune trojan Damocloid Trans-Neptunian object Detached Kuiper belt Oort cloud Scattered disc

Comets

Other

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