(379) Huenna

Asteroid (379) Huenna
Properties of the orbit ( animation ) Epoch: 4th September 2017 ( JD 2,458,000.5)
Orbit type	Outer main belt
Asteroid family	Themis family
Major semi-axis	3.1407 AU
eccentricity	0.1840
Perihelion - aphelion	2.5628 AU - 3.7187 AU
Inclination of the orbit plane	1.671 °
Length of the ascending node	172.028 °
Argument of the periapsis	180.056 °
Time of passage of the perihelion	March 12, 2020
Sidereal period	5 a 208 d
Mean orbital velocity	16.83 km / s
Physical Properties
Medium diameter	84.8 ± 1.6 km
Dimensions	3.83 ± 0.19 x 10 ¹⁷ kg
Albedo	0.0587 ± 0.002
Medium density	0.85 ± 0.15 g / cm³
Rotation period	7 h 1 min
Absolute brightness	8.87 likes
Spectral class	B.
history
Explorer	Auguste H. P. Charlois
Date of discovery	January 8, 1894
Another name	1894 AQ, 1948 XM, A895 DB, A911 BA
Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items.

(379) Huenna is an asteroid located in the main outer belt . It has a moon named S / 2003 (379) 1 .

Discovery and naming

Huenna was discovered on January 8, 1894 by the French astronomer Auguste Honoré Pierre Charlois at the Observatoire de Nice in Nice ( France ).

The celestial body was named after the Swedish island of Ven (Danish Hven ) in the Oresund , where the Danish astronomer Tycho Brahe maintained his castle and his observatory Uranienburg .

In total, the asteroid has been observed through several earth-based telescopes, a total of 3084 times within 123 years. (As of Sept. 2017)

Track properties

The orbit of Huenna (blue) between the orbits of Mars and Jupiter.

Orbit

Huenna orbits the Sun in a prograde , elliptical orbit between 383,380,000 km (2.56 AU ) and 556,310,000 km (3.72 AU) from its center. The orbital eccentricity is 0.184, the web is about 1.67 ° relative to the ecliptic inclined . Its orbit is therefore in the outer asteroid belt .

The orbit period of Huenna is 5.57 years.

rotation

Huenna rotates once around its axis in 7 hours, 1 minute. From this it follows that the asteroid performs 6,948.6 self- rotations ("days") in a Huenna year .

Physical Properties

size

The observations made so far indicate an irregularly shaped body; the most precise determination of the diameter ( geometric mean ) is 84.787 km. The exact dimensions are currently unclear.

Assuming a mean diameter of 84.8 km, the surface area is about 22,600 km ² , which is just over the area of Israel .

Provisions of the diameter for Huenna

year	Dimensions km	source
2001	92.33 ± 1.7	Tedesco ( IRAS ) u. a.
2008	98 ± 3	Marchis et al. a.
2011	87.47 ± 2.36	Masiero et al. a.
2014	84.787 ± 1.558	Masiero et al. a.

The most precise / current determination is marked in bold .

internal structure

Huenna belongs to the B-type asteroids (according to another classification: C) and therefore has a dark, carbon-rich surface with an albedo of 0.065. The surface color is therefore darker than coal. The unusually low mean density of 0.85 g / cm ³ - which is below the density of water - is an indication that it is not a compact body, but that the asteroid is likely to be a rubble pile , a collection of Dust and rocks that are riddled with cavities.

The mean surface temperature is 159 K (−114 ° C).

moon

On August 14, 2003, Jean-Luc Margot discovered a moon Huennas at the Mauna Kea observatory with the help of the Keck II telescope , which was given the provisional designation S / 2003 (379) 1 . The moon is 5.8 kilometers in diameter and orbits Huenna in 87.6 days within Huenna's Hill radius (15,000 km) at a distance of about 3,300 km.

The Huenna system at a glance:

Components	Physical parameters			Path parameters				discovery
Surname	Throughput diameter (km)	Relative size %	Mass (kg)	Major semi-axis (km)	Orbital time (d)	eccentricity	Inclination to Huenna's equator	Date of discovery Date of publication
(379) Huenna	84.8	100.00	?	-	-	-	-	January 8, 1894 48940000 ♠1894
S / 2003 (379) 1 (Huenna I)	5.8	6.8	?	3336	87.6	?	?	August 14, 2003 50030815 ♠August 15, 2003

Web links

Wm. Robert Johnston: (379) Huenna and S / 2003 (379) 1 (English)

Individual evidence

↑ (379) Huenna in the Small-Body Database of the Jet Propulsion Laboratory (English).
↑ IRAS (2001): The Supplemental IRAS Minor Planet Survey. Retrieved September 13, 2017 .
^ Franck Marchis et al .: Main belt binary asteroidal systems with eccentric mutual orbits . May 2008, arxiv : 0804.1385 .
^ Joseph R. Masiero et al: Main Belt Asteroids with WISE / NEOWISE I: Preliminary Albedos and Diameters . September 2011, arxiv : 1109.4096 .
^ Joseph R. Masiero et al.: Main-belt Asteroids with WISE / NEOWISE: Near-infrared Albedos . August 2014, bibcode : 2014ApJ ... 791..121M .
^ Daniel WE Green: IAUC No. 8182: S / 2003 (379) 1 Discovery Publication (August 2003). Retrieved September 13, 2017 .

[JPL-1] (379) Huenna in the Small-Body Database of the Jet Propulsion Laboratory (English).

[iras-2] IRAS (2001): The Supplemental IRAS Minor Planet Survey. Retrieved September 13, 2017 .

[marchis-3] Franck Marchis et al .: Main belt binary asteroidal systems with eccentric mutual orbits . May 2008, arxiv : 0804.1385 .

[masiero-4] Joseph R. Masiero et al: Main Belt Asteroids with WISE / NEOWISE I: Preliminary Albedos and Diameters . September 2011, arxiv : 1109.4096 .

[masiero2-5] Joseph R. Masiero et al.: Main-belt Asteroids with WISE / NEOWISE: Near-infrared Albedos . August 2014, bibcode : 2014ApJ ... 791..121M .

[iauc8182-6] Daniel WE Green: IAUC No. 8182: S / 2003 (379) 1 Discovery Publication (August 2003). Retrieved September 13, 2017 .