| NGC 7006 | |
|---|---|
) Hubble image of NGC 7006 | |
| Observation data (J2000 epoch) | |
| Class | I[1] |
| Constellation | Delphinus |
| Right ascension | 21h 1m 29.4s[2] |
| Declination | +16° 11′ 14.4″[2] |
| Distance | 137×103 ly (42 kpc)[3] |
| Apparent magnitude (V) | 10.6[4] |
| Apparent dimensions (V) | 2.8′[4] |
| Physical characteristics | |
| Mass | 3.03×105[5] M☉ |
| Metallicity | = –1.52[5] dex |
| Other designations | Caldwell 42 |
![{\displaystyle {\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}}](http://img.tfd.com/wiki/math/90/4c0821bd80891e071c08e7c7ee8e022baedf522c.svg)
NGC 7006 (also known as Caldwell 42) is a globular cluster[2] in the constellation Delphinus. NGC 7006 resides in the outskirts of the Milky Way. It is about 135,000[6] light-years away, five times the distance between the Sun and the centre of the galaxy, and it is part of the galactic halo. This roughly spherical region of the Milky Way is made up of dark matter, gas and sparsely distributed stellar clusters.
NGC 7006 appears in the science fiction novel Beyond the Farthest Star by Edgar Rice Burroughs, where it is used as a point of reference by the inhabitants of the planet Poloda to determine the approximate location of Earth.[7]
Gallery
NGC 7006 imaged by Hubble's Advanced Camera for Surveys.
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References
- ^ Shapley, Harlow; Sawyer, Helen B. (August 1927), "A Classification of Globular Clusters", Harvard College Observatory Bulletin, 849 (849): 11–14, Bibcode:1927BHarO.849...11S
- ^ a b c "NGC 7006". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2007-04-21.
- ^ Hessels, J. W. T.; et al. (November 2007), "A 1.4 GHz Arecibo Survey for Pulsars in Globular Clusters", The Astrophysical Journal, 670 (1): 363–378, arXiv:0707.1602, Bibcode:2007ApJ...670..363H, doi:10.1086/521780.
- ^ a b "Results for NGC 7006". SEDS NGC Catalog Online. Retrieved 2010-11-27.
- ^ a b Boyles, J.; et al. (November 2011), "Young Radio Pulsars in Galactic Globular Clusters", The Astrophysical Journal, 742 (1): 51, arXiv:1108.4402, Bibcode:2011ApJ...742...51B, doi:10.1088/0004-637X/742/1/51.
- ^ "A Remote Outpost of the Milky Way". ESA/Hubble Picture of the Week. 12 September 2011. Retrieved 13 September 2011.
- ^ Burroughs, Edgar Rice (2012). Beyond the Farthest Star. eStar Books. p. 47. ISBN 978-1-61210-538-3.
External links
Media related to NGC 7006 at Wikimedia Commons- NGC 7006 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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