379 Huenna

379 Huenna is a large asteroid orbiting in the asteroid belt. It is part of the Themis family, and thus a C-type asteroid and consequently composed mainly of carbonaceous material.

379 Huenna

Orbital diagram
Discovery[1]
Discovered by	Auguste Charlois
Discovery date	8 January 1894
Designations
MPC designation	(379) Huenna
Pronunciation	/hjuːˈɛnə/
Named after	Ven
Alternative designations	1894 AQ; A895 DB; A911 BA; 1948 XM
Minor planet category	Main belt (Themis)
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	122.26 yr (44656 d)
Aphelion	3.7186 AU (556.29 Gm)
Perihelion	2.5540 AU (382.07 Gm)
Semi-major axis	3.1363 AU (469.18 Gm)
Eccentricity	0.18567
Orbital period (sidereal)	5.55 yr (2028.7 d)
Mean anomaly	126.109°
Mean motion	0° 10m 38.82s / day
Inclination	1.6699°
Longitude of ascending node	172.036°
Argument of perihelion	179.961°
Known satellites	1 (5.8±1.2 km)[2]
Physical characteristics
Mean diameter	92.33±1.7 km (IRAS)[1] 98±3 km[2]
Mass	(3.83±0.19)×1017 kg[2][3]
Mean density	0.9±0.1 g/cm3[2][3] 1.2 g/cm3[4][5]
Synodic rotation period	14.141 h (0.5892 d)[1]
Geometric albedo	0.0587±0.002[1]
Spectral type	C[3]
Absolute magnitude (H)	8.87[1]

It was discovered by Auguste Charlois on 8 January 1894 in Nice. It is the Latin name for the Swedish island of Ven, the site of two observatories. This island is where Tycho Brahe built his observatory.^[6]

Satellite

A satellite, 7 km across and designated S/2003 (379) 1, was discovered on 14 August 2003 by Jean-Luc Margot using the Keck II adaptive optics telescope at Mauna Kea.^[7] The moon orbits 3400±11 km away in 80.8±0.36 d with an eccentricity of 0.334±0.075.^[5] The system is loosely bound^[4] as Huenna has a Hill sphere with a radius of about 20,000 km.^[2]

The orbit of Huenna's satellite