|Observation data (J2000 epoch)|
|Right ascension||21h 1m 29.4s|
|Declination||+16° 11′ 14.4″|
|Distance||137 kly (42 kpc)|
|Apparent magnitude (V)||10.6|
|Apparent dimensions (V)||2.8′|
|Other designations||Caldwell 42|
NGC 7006 (also known as Caldwell 42) is a globular cluster in the constellation Delphinus. NGC 7006 resides in the outskirts of the Milky Way. It is about 135,000 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.
NGC 7006 imaged by Hubble's Advanced Camera for Surveys.
- Shapley, Harlow; Sawyer, Helen B. (August 1927), "A Classification of Globular Clusters", Harvard College Observatory Bulletin (849): 11–14,
- "SIMBAD Astronomical Database". Results for NGC 7006. 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,
- "SEDS NGC Catalog Online". Results for NGC 7006. Retrieved 2010-11-27.
- Boyles, J. et al. (November 2011), "Young Radio Pulsars in Galactic Globular Clusters", The Astrophysical Journal 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. Retrieved 2014-11-19.
- NGC 7006 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images