Cybele asteroids


The Cybele asteroids are a dynamical group of asteroids, named after the asteroid 65 Cybele. Considered by some as the last outpost of an extended asteroid belt, the group consists of just over 2000 members and a few collisional families. Their orbit is defined by an osculating semi-major axis of 3.27 to 3.70 AU, with an eccentricity of less than 0.3, and an inclination less than 30°.
The dynamical Cybele group is located adjacent to the outermost asteroid belt, beyond the Hecuba gap – the 2:1 resonant zone with Jupiter, where the Griqua asteroids are located – and inside the orbital region of the Hilda asteroids, which are themselves followed by the Jupiter trojans further out.

Description

Three known asteroid families exist within the Cybele group: the Sylvia family, the Huberta family and the Ulla family. A potential fourth family is a small cluster with the parent body. A fifth family, named after 522 Helga, was identified in 2015.
The Cybele asteroids 87 Sylvia and 107 Camilla are triple systems with more than one satellite. Other large members include 121 Hermione, 76 Freia, 790 Pretoria, and 566 Stereoskopia.
The group is thought to have formed from the breakup of a larger object in the distant past. While most members are C- and X-type asteroids, NASA's Wide-field Infrared Survey Explorer also measured albedos of some Cybele asteroids that are typical for stony S-type asteroids.

List

Total of 2034 Cybeles with osculating semi-major axis between 3.28 and 3.7 AU. Low numbered members of the collisional Sylvia and smaller Ulla families are also marked.65 Cybele76 Freia87 Sylvia 107 Camilla 121 Hermione168 Sibylla225 Henrietta229 Adelinda260 Huberta319 Leona401 Ottilia414 Liriope420 Bertholda466 Tisiphone483 Seppina522 Helga528 Rezia536 Merapi566 Stereoskopia570 Kythera643 Scheherezade692 Hippodamia713 Luscinia721 Tabora733 Mocia790 Pretoria909 Ulla 940 Kordula1004 Belopolskya1028 Lydina1091 Spiraea1154 Astronomia1167 Dubiago1177 Gonnessia1266 Tone1280 Baillauda1295 Deflotte1328 Devota1373 Cincinnati1390 Abastumani1467 Mashona1556 Wingolfia1574 Meyer
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