NGC 6553
| NGC 6553 | |
|---|---|
 The globular cluster NGC 6553 Credit: HST | |
| Observation data (J2000 epoch) | |
| Class | V |
| Constellation | Sagittarius |
| Right ascension | 18h 09m 15.68s[1] |
| Declination | −25° 54′ 27.9″[1] |
| Distance | 7.2 kly (2.2 kpc)[1] |
| Apparent magnitude (V) | 8.06[2] |
| Physical characteristics | |
| Radius | 4.1' x 4.1'[2] |
| Metallicity | = -0.18[3] dex |
| Other designations | GCl 88, C 1806-259[1] |
![{\displaystyle {\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/4c0821bd80891e071c08e7c7ee8e022baedf522c)
NGC 6553 is a globular cluster in the constellation Sagittarius. NGC 6553 has an apparent magnitude of about 8 magnitudes with an apparent diameter of 8.2 arcminutes.[2] Its Shapley–Sawyer Concentration Class is XI,[2] meaning the star concentration is very loose even at the center; it has stars of magnitude 20 and dimmer. It is located just over a degree southeast of Messier 8, the Lagoon Nebula.
References
- ^ a b c d "NGC 6553". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 January 2017.
- ^ a b c d "NGC 6553". Retrieved 8 January 2016.
- ^ "A Galactic Globular Clusters Database: NGC 6553". Retrieved 8 January 2017.
External links
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