Astronomy:Hercules Cluster
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Short description: Star cluster in the constellation Hercules
| Hercules Cluster | |
|---|---|
 | |
| Observation data (Epoch J2000) | |
| Constellation(s) | Hercules |
| Right ascension | 16h 05m 15.0s[1] |
| Declination | +17° 44′ 55″[1] |
| Brightest member | NGC 6041 |
| Number of galaxies | 300[2] |
| Richness class | 2[3] |
| Bautz–Morgan classification | III[3] |
| Redshift | 0.03660 (10 972 km/s)[1] |
| Distance (co-moving) | 156 Mpc (509 Mly) h−10.705 [1] |
| X-ray flux | (15.00 ± 12.5%)×10−12 erg s−1 cm−2 (0.1—2.4 keV) [1] |
| Other designations | |
| Abell 2151 | |
The Hercules Cluster (Messier 13) is a star cluster of about 100,000 visible stars [4] it is 25,000 light-years away it lies in the distant constellation of Hercules It is one of the brightest and best known globular clusters in the northern sky. The cluster has an apparent magnitude of 5.8 . It was discovered by Edmund Halley in 1714. Charles Messier added the cluster to his catalog in 1764.
See also
- Abell catalogue
- List of Abell clusters
- X-ray Astronomy
External links
- NASA Astronomy Picture of the Day: The Hercules Cluster of Galaxies (July 19, 2007)
- NASA Astronomy Picture of the Day: The Hercules Cluster of Galaxies (July 16, 2009)
- Hercules Cluster — University of Alabama
- The Hercules Cluster on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
References
- ↑ 1.0 1.1 1.2 1.3 1.4 "NASA/IPAC Extragalactic Database". Results for Abell 2151. http://nedwww.ipac.caltech.edu/.
- ↑ "National Optical Astronomy Observatory". Galaxies. http://www.noao.edu/image_gallery/html/im0658.html.
- ↑ 3.0 3.1 Abell, George O.; Corwin, Harold G., Jr.; Olowin, Ronald P. (May 1989). "A catalog of rich clusters of galaxies" (PDF). Astrophysical Journal Supplement Series 70 (May 1989): 1–138. doi:10.1086/191333. ISSN 0067-0049. Bibcode: 1989ApJS...70....1A. http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1989ApJS...70....1A&page_ind=0&epage_ind=137&type=PRINTER&data_type=PDF_HIGH&email=&emailsize=500&emailsplit=YES&send=GET&verified=YES. Retrieved March 13, 2012.
- ↑ "Two Micron All Sky Survey". 2MASS Galaxy Science & Analysis. http://spider.ipac.caltech.edu/staff/jarrett/2mass/3chan/redshift/gz_cat.html.
Coordinates: 
16h 05m 15s, +17° 44′ 55″
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