Hati (moon)

Hati

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
Alternative names	S/2004 S 14
Orbital characteristics
Semi-major axis	19856000 km
Eccentricity	0.372
Orbital period (sidereal)	−1038.7 days
Inclination	165.8°
Satellite of	Saturn
Group	Norse group
Physical characteristics
Mean diameter	5+50% −30% km
Synodic rotation period	5.45±0.04 h
Apparent magnitude	24.4

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 6 kilometers in diameter, and orbits Saturn at an average distance of 20,303 Mm in 1080 days, at an inclination of 163° to the ecliptic (165° to Saturn's equator), in a retrograde direction and with an eccentricity of 0.291. 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.

It was named in April 2007 after Hati, a giant wolf from Norse mythology, son of Fenrisúlfr and twin brother of Sköll.

References

• Scott Sheppard's Giant Planet Satellites Page (Saturn Satellite Data)
• Dave Jewitt: 12 new Satellites of Saturn May 3, 2005
• IAUC 8523: New Satellites of Saturn May 4, 2005 (discovery)
• MPEC 2005-J13: Twelve New Satellites of Saturn May 3, 2005 (discovery and ephemeris)
• IAUC 8826: Satellites of Jupiter and Saturn April 5, 2007 (naming the moon)
• Denk, T., Mottola, S. (2013): Irregular Saturnian Moon Lightcurves from Cassini-ISS Observations: Update. Abstract 406.08, DPS conference 2013, Denver (Colorado), October 10, 2013 (synodic rotation period)