Paaliaq — an irregular moon of Saturn

Discovery and name

The object was discovered by a team of astronomers in early October 2000. The discovery credits include several researchers who have been active in finding small outer satellites of the giant planets. In 2003 the International Astronomical Union approved the name Paaliaq, taken from a character in the book The Curse of the Shaman by Michael Kusugak. The author provided a list of names rooted in Inuit culture and folklore that were adopted for several of Saturn’s moons; the naming history and announcement are documented in the naming notice.

Orbit and physical characteristics

Paaliaq follows an eccentric, inclined orbit at an average distance of about 15.2 million kilometres from Saturn. Its non-spherical shape and modest size are typical of irregular satellites that are too small for their gravity to pull them into a rounded form. Photometric observations show that Paaliaq has a light-red colour, closely matching the hues measured for nearby moons such as Kiviuq and Siarnaq. This similarity in colour and other surface properties is an important clue to a shared origin.

Group membership and origin theories

Paaliaq is a member of the so-called Inuit group, a collection of prograde irregular satellites of Saturn that share broadly similar orbital inclinations and spectral characteristics. Astronomers infer that these moons are fragments of a larger progenitor that was either captured by Saturn and then shattered, or that an existing satellite was disrupted by a collision. The compositional likeness among group members supports the collisional-fragment hypothesis, though details of the original body and the breakup event remain subjects of study.

Observation, study, and importance

Because Paaliaq is faint and distant, it is primarily studied through careful astrometry and photometry using large telescopes. Measurements of its orbit help refine models of Saturn’s gravitational environment and the dynamical evolution of irregular satellites. Spectral and colour data inform theories about the composition of outer-system bodies and the processes that generate collisional families. Paaliaq and its companions thus provide natural laboratories for understanding capture events, fragmentation, and surface processing in the outer reaches of planetary systems.

Key facts

• Provisional designation: S/2000 S 2
• Approximate diameter: 22 km
• Average orbital distance: ~15.2 million km from Saturn
• Orbital period: ~687 days
• Group: Inuit group (prograde irregular satellites)
• Colour: light red, similar to Kiviuq and Siarnaq

For further technical data and updated orbital elements consult professional databases and the literature; the discovery and naming records are available through the links above and related scientific notices.