Hati (moon)

Hati

Hati imaged by the Cassini spacecraft in November 2015
Discovery
Discovery date	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)