(7758) Poulanderson
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Asteroid (7758) Poulanderson |
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| Properties of the orbit ( animation ) | |
| Orbit type | Inner main belt asteroid |
| Major semi-axis | 2.3820 AU |
| eccentricity | 0.1856 |
| Perihelion - aphelion | 1.9398 AU - 2.8241 AU |
| Inclination of the orbit plane | 21.6359 ° |
| Length of the ascending node | 203.5498 ° |
| Argument of the periapsis | 56.0496 ° |
| Sidereal period | 3.68 a |
| Mean orbital velocity | 19.30 km / s |
| Physical Properties | |
| Rotation period | 2.64752 (± 0.00007) h |
| Absolute brightness | 14.4 mag |
| history | |
| Explorer | Eleanor Helin |
| Date of discovery | May 21, 1990 |
| Another name | 1990 KT |
| 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. | |
(7758) Poulanderson is a main inner belt asteroid discovered on May 21, 1990 by the American astronomer Eleanor Helin at the Palomar Observatory ( IAU code 675) in California .
The asteroid belongs to the Phocaea family, a group of asteroids named after (25) Phocaea . The 4: 1 orbital resonance with the planet Jupiter is characteristic of this group . The solar orbit of (7758) Poulanderson is steeply inclined at more than 21 ° to the ecliptic of the solar system , which is characteristic of Phocaea asteroids.
The asteroid's period of rotation was first examined on May 5, 2012 by Brian D. Warner at the Palmer Divide Observatory in Colorado . However, the first values were inconsistent. An occlusion of the asteroid was observed, so the first assumption was that (7758) Poulanderson was a double asteroid . The first measurements indicated a rotation period of more than 24 hours, so that other observatories were included. From May 5 to June 1, 2012, the asteroid was observed more than 900 times, including by the Center of Solar System Studies in California, the Sugarloaf Mountain Observatory in Massachusetts , the Skalnaté Pleso observatory in Slovakia , at the Appalachian State University in North Carolina and from the Ondřejov observatory in the Czech Republic . The occultation or eclipse was not observed again. With the evaluation of the joint data it was calculated that the asteroid rotates around itself in 2.64752 (± 0.00007) hours.
Naming
(7758) was Poulanderson American US after the September 2, 2001 science fiction - writer Poul Anderson named four weeks after Anderson's death. The suggestion for a name came from the science fiction writer and astrophysicist David Brin , after whom an asteroid is also named: (5748) Davebrin .
See also
Web links
- (7758) Poulanderson in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
- (7758) Poulanderson 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 by (7758) Poulanderson according to the Minor Planet Center of the International Astronomical Union at the Harvard-Smithsonian Center for Astrophysics in Cambridge , Massachusetts (English)
Individual evidence
- ^ Brian D. Warner, Alan W. Harris, Petr Pravec , Peter Kušnirák , Kamil Hornoch , Robert D. Stevens, Donald P. Pray , Marek Husárik, Joseph Pollock , Daniel E. Reichart, Kevin M. Ivarsen, Melissa C. Nysewander , Aaron P. LaCluyze: Lightcurve For 7758: A Possible Binary? . The Minor Planet Bulletin, Vol. 39, No. 4, July 5, 2012, page 232f, bibcode : 2012MPBu ... 39..232W (English)