Stephan's quintet
Stephan's Quintet is a group of five galaxies in the constellation Pegasus , which was discovered on September 22, 1877 by the French astronomer Édouard Jean-Marie Stephan .
The galaxy group consists of the galaxies NGC 7317 , NGC 7318A , NGC 7318B , NGC 7319 and NGC 7320C .
The galaxies NGC 7317 to NGC 7319 form a spatially narrow, interacting system about 300 million light years away. Due to the mutual gravitational effect , the spiral arms of the galaxies are irregularly deformed.
NGC 7320 was originally counted as part of Stephan's quintet by the eponym, but this galaxy is a foreground galaxy in only 35 due to a significantly lower heliocentric radial relative speed (~ 800 km / s compared to ~ 6500–7000 km / s for the other galaxies) Millions of light years away, which only coincides with the projection of Stephan's quintet. Instead, NGC 7320C is now added to the quintet, so that there are still five galaxies.
The galaxies of Stephan's quintet have a brightness of about 13 mag . To observe them, you need a telescope with an opening of at least 20 cm.
Amateur recording by Stephans Quintet and NGC7331. The image section shown is marked on the location map .
See also
literature
- C. Kevin Xu: Stephan's Quintet: A Multi-galaxy Collision. ( PDF ) - Summary of the state of knowledge about Stephans Quintett, as of December 2005.
Web links
- Intergalactic shock wave in Stephan's quintet (uni-bonn.de ua)
- astronews: A detailed look at Stephen's quintet
- Direct spectrum: Too close to the red lantern
- extrasolarplanets: Galactic contortionists captured by the Gemini Observatory
- NOAO
- A Shocking Surprise in Stephan's Quintet. ( Memento from June 25, 2010 in the web archive archive.today ) In: Spitzer Space Telescope.
- Hubble Space Telescope
- NASA / IPAC EXTRAGALACTIC DATABASE
Individual evidence
- ↑ Tammy Plotner, Jeff Barbour: What's Up 2006 - 365 Days of Skywatching. P. 274, ISBN 978-1-4116-8287-0 . (English), accessed on June 29, 2011.