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Erriapus (/ˌɛriˈæpəs/ ERR-ee-AP-əs; Latin: Erriapus, Erriappus), also Saturn XXVIII (28), is a prograde irregular satellite of Saturn. It was discovered by Brett Gladman, John J. Kavelaars and colleagues in 2000, and given the temporary designation S/2000 S 10.[5][6] It was named Erriapo in August 2003[7] after Erriapus, a giant in Gaulish mythology; the name was changed from dative Erriapo to nominative Erriapus per IAU conventions in late 2007.[8][9]

Erriapus
Discovery[1]
Discovered byJohn J. Kavelaars et al.
Discovery datein 2000
Designations
Saturn XXVIII
S/2000 S 10
Orbital characteristics[2]
Epoch 2000 Feb. 26.00
17 343 000 km
Eccentricity0.4724
871.2 d
(2.38 yr)
Inclination34.692
Physical characteristics
Dimensions10 km[3]
Albedo0.04 (assumed)[3]
Spectral type
light red
B−V=0.83, R−V=0.49[4]

Erriapus is about 10 kilometres in diameter, and orbits Saturn at an average distance of 17,3 Gm in 871 days.

As a member of the Gallic group of irregular satellites, which share similar orbital characteristics and a light-red colour, Erriapus is hypothesized to have its origin in the break-up of a common progenitor of the group,[4][10] or to be a fragment of its largest member, Albiorix.[11]

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