(317) Roxane
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Asteroid (317) Roxane |
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|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type | Inner main belt |
| Major semi-axis | 2.2861 AU |
| eccentricity | 0.0860 |
| Perihelion - aphelion | 2.0896 AU - 2.4827 AU |
| Inclination of the orbit plane | 1.766 ° |
| Length of the ascending node | 151.382 ° |
| Argument of the periapsis | 186.774 ° |
| Time of passage of the perihelion | March 14, 2016 |
| Sidereal period | 3 a 167.6 d |
| Mean orbital velocity | 19.7 km / s |
| Physical Properties | |
| Medium diameter | 18.6 ± 0.2 km |
| Albedo | 0.926 ± 0.044 |
| Medium density | (1.6) g / cm³ |
| Rotation period | 8 h 10 min 8 s |
| Absolute brightness | 10.03 mag |
| Spectral class | E. |
| history | |
| Explorer | Auguste H. P. Charlois |
| Date of discovery | September 11, 1891 |
| 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. | |
(317) Roxane is an asteroid of the main inner asteroid belt . It has a moon named S / 2009 (317) 1 .
Discovery and naming
Roxane was discovered on September 11, 1891 by the French astronomer Auguste Honoré Pierre Charlois at the Observatoire de Nice in Nice ( France ).
The celestial body was named after Roxane , the first wife of Alexander the Great , king of ancient Macedonia . The name was suggested by the assistant Friedrich Bidschof of the Vienna University Observatory at the request of the discoverer Charlois. Bidschof originally decided to use the Roxana spelling . The name was finally given in 1893.
Overall, the asteroid has been observed through several earth-based telescopes, a total of 2164 times within 125 years. (As of Sept. 2017)
Track properties
Orbit
Roxane orbits the Sun in a prograde , elliptical orbit between 312,600,000 km (2.09 AU ) and 371,400,000 km (2.48 AU) from its center. The orbital eccentricity is 0.086, the web is about 1.77 ° relative to the ecliptic inclined . Its orbit is therefore in the inner asteroid belt .
The orbital period of Roxane is 3.46 years.
rotation
Roxane rotates once around its axis in 8 hours, 10 minutes 8 seconds. From this it follows that the asteroid performs 3,709.4 self- rotations ("days") in a Roxane year .
Physical Properties
size
The observations made so far indicate an irregularly shaped body; the most precise determination of the diameter ( geometric mean ) is 18.65 km. The exact dimensions are currently unclear.
Assuming an average diameter of 18.65 km, this results in a surface area of around 1,239 km 2 , which is roughly between the areas of the Swiss cantons of Uri and Aargau .
Provisions of the diameter for Roxane
| year | Dimensions km | source |
|---|---|---|
| 2001 | 18.67 ± 1.4 | Tedesco ( IRAS ) et al. |
| 2011 | 19.86 ± 0.12 | Masiero et al. |
| 2014 | 18.648 ± 0.162 | Masiero et al. |
The most precise / most recent determination is marked in bold .
internal structure
Roxane belongs to the E – type asteroids (according to another classification: Xe) and therefore has a very bright surface with an albedo of 0.926. The density is an estimated 1.6 g / cm 3 , which could be an indication that it is not a compact body, but rather a rubble pile , a collection of dust and rocks that is riddled with voids.
2008, a team of astronomers identified Roxane as the most obvious match for the spectroscopic Peña Blanca Spring - meteorites formed in a swimming pool near the August 2, 1946 Marathon ended, Texas. There is therefore the possibility that Roxane is the original body of the meteorite.
The mean surface temperature is 157 K (−116 ° C).
moon
On November 24, 2009, a team of astronomers from the Mauna Kea Observatory discovered a moon Roxanes with the help of the Gemini-North telescope , which was given the provisional designation S / 2009 (317) 1 . The moon has a diameter of 5.3 kilometers and orbits Roxane in 14 days within Roxane's Hill radius (3,200 km) at a distance of 257 km.
The Roxane 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 Roxane's equator |
Date of discovery Date of publication |
|
(317) Roxane |
18.6 | 100.00 | ? | - | - | - | - | September 11, 1891 1891 |
|
S / 2009 (317) 1 (Roxane I) |
5.3 | 28.4 | ? | 257 | 14.0 | ? | ? | November 24, 2009 November 26, 2009 |
See also
Web links
- Wm. Robert Johnston: (317) Roxane and S / 2009 (317) 1 (English)
- Brian G. Marsden: S / 2009 (317) 1 With photo by Roxane and S / 2009 (317) 1 (English)
- Hanuš et al .: Asteroid (317) Roxane Rotatable 3D model from Roxane (English)
Individual evidence
- ↑ Auguste Charlois: Designation of small planets. Retrieved September 12, 2017 .
- ↑ (317) Roxane in the Small-Body Database of the Jet Propulsion Laboratory (English).
- ↑ IRAS (2001): The Supplemental IRAS Minor Planet Survey. Retrieved September 12, 2017 .
- ^ 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 .
- ^ John T. Lonsdale: The Peña Blanca Spring Meteorite, Brewster County, Texas. (PDF) Retrieved September 12, 2017 .
- ^ S. Fornasier: Visible and near infrared spectroscopic investigation of E-type asteroids, including 2867 Steins, a target of the Rosetta mission. Retrieved September 12, 2017 .
- ↑ Daniel WE Green: IAUC No. 9099: S / 2009 (317) 1 discovery publication . December 2009, bibcode : 2009IAUC.9099 .... 2M .