(379) Huenna
Asteroid (379) Huenna |
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Properties of the orbit ( animation ) | |
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
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 | |||||
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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 1894 |
S / 2003 (379) 1 (Huenna I) |
5.8 | 6.8 | ? | 3336 | 87.6 | ? | ? | August 14, 2003 August 15, 2003 |
See also
Web links
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 .