&sq=&lang=&file=File:Hati-cassini.png) Hati imaged by the Cassini spacecraft in November 2015 | |
| Discovery | |
|---|---|
| Discovered by | Scott S. Sheppard David C. Jewitt Jan T. Kleyna Brian G. Marsden |
| Discovery date | December 2004 |
| Designations | |
Designation | Saturn XLIII |
Named after | Hati Hróðvitnisson |
| S/2004 S 14 | |
| Orbital characteristics[1] | |
| 19697100 km | |
| Eccentricity | 0.375 |
| −1040.29 days | |
| Inclination | 164.1° |
| Satellite of | Saturn |
| Group | Norse group |
| Physical characteristics[2][3] | |
| 5+50% −30% km | |
| Mass | ≥6.5×1013 kg (calculated) |
Mean density | ≥1 g/cm3[4][5] |
| 5.45±0.04 h | |
| Albedo | 0.06 (assumed) |
| 24.4 | |
| 15.3 | |
Hati /ˈhɑːti/ or Saturn XLIII is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on 4 May 2005, from observations taken between 12 December 2004 and 11 March 2005.
Hati is about 5 kilometers in diameter, and orbits Saturn at an average distance of 19,697 Mm in 1040 days, at an inclination of 164° to the ecliptic, in a retrograde direction and with an eccentricity of 0.375, somewhat similar to Mundilfari's orbit.[1] In March 2013, the synodic rotational period was measured by Cassini to about 5.45±0.04 hours. This is the fastest known rotation of all of Saturn's moons,[2] and in fact the fastest known among all moons (including asteroid moons) for which a rotation period has been reliably measured. Like Mundilfari, it is very elongated in shape.[3]
It was named in April 2007 after Hati, a giant wolf from Norse mythology, son of Fenrisúlfr and twin brother of Sköll.
- ^ a b "Planetary Satellite Mean Elements". ssd.jpl.nasa.gov. Retrieved 2024-02-08.
- ^ a b Denk, T.; Mottola, S. (2019). Cassini Observations of Saturn's Irregular Moons (PDF). 50th Lunar and Planetary Science Conference. Lunar and Planetary Institute.
- ^ a b Denk, Tilmann; Mottola, Stefano; Tosi, Frederico; Bottke, William F.; Hamilton, Douglas P. (2018). "The Irregular Satellites of Saturn" (PDF). In Schenk, Paul M.; Clark, Roger N.; Howett, Carly J. A.; Verbiscer, Anne J.; Waite, J. Hunter (eds.). Enceladus and the Icy Moons of Saturn. Space Science Series. Vol. 322. Tucson, AZ: The University of Arizona Press. pp. 409–434. Bibcode:2018eims.book..409D. doi:10.2458/azu_uapress_9780816537075-ch020. ISBN 9780816537075.
- ^ Denk, Tilmann; Mottola, S. (2013-10-01). "Irregular Saturnian Moon Lightcurves from Cassini-ISS Observations: Update". Aas/Division for Planetary Sciences Meeting Abstracts #45. 45: 406.08. Bibcode:2013DPS....4540608D.
- ^ Abstract Book Correlating to the Online Bulletin of the American Astronomical Society (PDF). 45th Annual Meeting Division for Planetary Sciences. Vol. 45. American Astronomical Society. October 2013. p. 170.