(8590) Pygargus
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Asteroid (8590) Pygargus |
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|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type | Main outer belt asteroid |
| Asteroid family | Themis family |
| Major semi-axis | 3.2249 AU |
| eccentricity | 0.1260 |
| Perihelion - aphelion | 2.8185 AU - 3.6313 AU |
| Inclination of the orbit plane | 1.8742 ° |
| Length of the ascending node | 121.8171 ° |
| Argument of the periapsis | 153.1582 ° |
| Sidereal period | 5.79 a |
| Mean orbital velocity | 16.60 km / s |
| Physical Properties | |
| Absolute brightness | 13.2 mag |
| history | |
| Explorer |
Cornelis Johannes van Houten , Ingrid van Houten-Groeneveld , Tom Gehrels |
| Date of discovery | September 24, 1960 |
| Another name | 6533 PL , 1954 QE 1 , 1989 TU 12 |
| 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. | |
(8590) Pygargus is an asteroid of the main outer belt that was discovered on September 24, 1960 by the Dutch astronomer couple Cornelis Johannes van Houten and Ingrid van Houten-Groeneveld . The discovery came about as part of the Palomar-Leiden survey , during which Tom Gehrels examined field plates recorded at the University of Leiden with the 120 cm Oschin Schmidt telescope of the Palomar observatory . There was an unconfirmed sighting (1954 QE 1 ) of the asteroid at the Palomar Observatory on August 27, 1954.
The asteroid belongs to the Themis family, a group of asteroids named after (24) Themis . According to the SMASS classification ( Small Main-Belt Asteroid Spectroscopic Survey ), a spectroscopic study by Gianluca Masi , Sergio Foglia and Richard P. Binzel in (8590) Pygargus assumed a dark surface, so it could, roughly speaking, be around trade a C asteroid .
The timeless (non- osculating ) orbital elements of (8590) Pygargus are almost identical to those of the smaller, assuming the absolute magnitude of 16.2 versus 13.2, asteroids (243371) 2008 WY 119 .
(8590) pygargus after the harrier named, whose scientific name Circus pygargus reads. At the time the asteroid was named on February 2, 1999, the Montagu's Harrier was on the Dutch Red List of Endangered Species . The first letters of the asteroids (8585) to (8600) form the phrase Per aspera ad astra .
Web links
- (8590) Pygargus in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
- (8590) pygargus in the Small-Body Database of the Jet Propulsion Laboratory of NASA at the California Institute of Technology (Caltech) in Pasadena , California (English)
- Discovery Circumstances of (8590) Pygargus according to the Minor Planet Center of the International Astronomical Union at the Harvard-Smithsonian Center for Astrophysics in Cambridge , Massachusetts (English)
Individual evidence
- ↑ Obersvationen from (8590) Pygargus on minorplanetcenter.net (English)
- ^ Gianluca Masi, Sergio Foglia, Richard P. Binzel: Search for Unusual Spectroscopic Candidates Among 40313 minor planets from the 3rd Release of the Sloan Digital Sky Survey Moving Object Catalog . (English)
- ↑ subdivision of asteroids to S-types, C-types and V-types (English)
- ↑ The family status of the asteroids in the AstDyS-2 database (English, HTML; 51.4 MB)