The Phocaea family (/foʊˈsiːə/ foh-SEE-ə; adj. Phocaean; FIN: 701) is a collisional family of asteroids located between 2.25 and 2.5 AU in the inner region of the asteroid belt. Phocaea asteroids are of stony S-type composition and have orbits with eccentricities greater than 0.1 and inclinations between 18 and 32°.[1] The family has an estimated age of 2.2 billion years and derives its name from its most massive member, 25 Phocaea which is about 75 km in diameter. Several Phocaean asteroids are also Mars-crossers.[2][3]: 23 

Phocaea family region

The Phocaea family region contains other collisional families such as the recently identified carbonaceous, Tamara family,[4] named after its potentially largest member 326 Tamara. The family has an estimated age of 264 million years. Several clumps around 290 Bruna (Bruna family), 1192 Prisma and 6246 Komurotoru, as well as (17628) 1996 FB5, (19536) 1999 JM4 and (26142) 1994 PL1 have also been detected.[2]: 1514, 1515 

Members

Name a e i
25 Phocaea 2.400 0.255 21.584°
1090 Sumida 2.360 0.220 21.505°

References

  1. ^ "The different asteroid groups and families". EasySky. Retrieved 3 May 2018.
  2. ^ a b Carruba, V. (September 2009). "An analysis of the region of the Phocaea dynamical family" (PDF). Monthly Notices of the Royal Astronomical Society. 398 (3): 1512–1526. Bibcode:2009MNRAS.398.1512C. doi:10.1111/j.1365-2966.2009.15220.x. Retrieved 3 May 2018.
  3. ^ 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.
  4. ^ Novakovic, Bojan; Tsirvoulis, Georgios; Granvik, Mikael; Todovic, Ana (June 2017). "A Dark Asteroid Family in the Phocaea Region". The Astronomical Journal. 153 (6): 8. arXiv:1704.06088. Bibcode:2017AJ....153..266N. doi:10.3847/1538-3881/aa6ea8.
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