(7209) Cyrus
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Asteroid (7209) Cyrus |
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|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type | Middle main belt asteroid |
| Major semi-axis | 2.5927 AU |
| eccentricity | 0.0464 |
| Perihelion - aphelion | 2.4723 AU - 2.7130 AU |
| Inclination of the orbit plane | 8.8589 ° |
| Length of the ascending node | 329.9750 ° |
| Argument of the periapsis | 51.5663 ° |
| Time of passage of the perihelion | April 20, 2019 |
| Sidereal period | 4.17 a |
| Mean orbital velocity | 18.50 km / s |
| Physical Properties | |
| Medium diameter | 6.415 (± 0.163) km |
| Albedo | 0.297 (± 0.040) |
| Absolute brightness | 13.0 likes |
| history | |
| Explorer |
Cornelis Johannes van Houten , Ingrid van Houten-Groeneveld , Tom Gehrels |
| Date of discovery | October 17, 1960 |
| Another name | 3523 PL , 1958 DJ 1 , 1989 QB |
| 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. | |
(7209) Cyrus is an asteroid of the central main belt that was discovered on October 27, 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 . Unconfirmed sightings of the asteroid had already been made on February 24, 1958 under the provisional designation 1958 DJ 1 at the Goethe Link Observatory in Indiana .
The mean diameter of the asteroid was calculated to be 6.415 (± 0.163) km .
The rotation period of (7209) Cyrus was determined by Brian D. Warner in 2009 and by Adam Waszczak, Chan-Kao Chang, Eran Ofek et al. examined. However, the light curves were not sufficient for a determination.
(7209) Cyrus is named after Cyrus II , also called Cyrus the Great, a king of the ancient Persian Achaemenid dynasty from the 6th century BC. BC Cyrus is the Latin form of Cyrus .
Web links
- (7209) Cyrus in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
- (7209) Cyrus 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 (7209) Cyrus according to the Minor Planet Center of the International Astronomical Union at the Harvard-Smithsonian Center for Astrophysics in Cambridge , Massachusetts (English)
Individual evidence
- ↑ Observations by (7209) Cyrus on minorplanetcenter.net (English)