NGC 6251
Sign in to saveAlso known as New General Catalogue 6251
Seyfert galaxy in the constellation Ursa Minor
Key facts
- Constellation
- Ursa Minor
- Right ascension
- 16 32 31.9700
- Declination
- +82 ° 32 ′ 16.400 ″
- Distance
- 340 million light-years
- Type
- E
- Apparent size v
- 1.82´X1.55´
via Wikipedia infobox
Wikidata facts
- Instance of
- blazar
- Constellation
- Ursa Minor
- Image
- NGC 6251HST.jpg
Show 11 more facts
- catalog code
- Gaia DR2 1722820478889987840
- galaxy morphological type
- E
- redshift
- 0.023940
- Commons category
- NGC 6251
- discoverer or inventor
- William Herschel
- time of discovery or invention
- 1802-01-01
- apparent magnitude
- 9.026
- right ascension
- 248.133207917667
- declination
- 82.537888876111
- radial velocity
- 7091
- epoch
- J2000.0
via Wikidata · CC0
~1 min read
Encyclopedic overview
NGC 6251 is an active supergiant elliptical radio galaxy in the constellation Ursa Minor, and is more than 340 million light-years away from Earth. The galaxy has a Seyfert 2 active galactic nucleus, and is one of the most extreme examples of a Seyfert galaxy. This galaxy may be associated with gamma-ray source 3EG J1621+8203, which has high-energy gamma-ray emission. It is also noted for its one-sided radio jet—one of the brightest known—discovered in 1977. The supermassive black hole at the core has a mass of (5.9±2.0)×10 M☉.
References
Excerpted from Wikipedia’s “NGC 6251” article, available under the CC BY-SA 4.0 licence.