Sh 2-185
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Sh 2-185 is an H II region centered on the massive star system Gamma Cassiopeiae (γ Cas) in the northern constellation of Cassiopeia. It was included in the second Catalogue of H II Regions, published in 1959 by Stewart Sharpless.[3] Sh 2-185 is located at a distance of approximately 10,500 ly (3.23 kpc) from the Sun.[2] The region is surrounded by a dust shell,[4] and displays several infrared point sources that are a characteristics of young stellar objects.[5]
A request that this article title be changed to Sh2-185 is under discussion. Please do not move this article until the discussion is closed. |
Emission nebula | |
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H II region | |
Observation data: J2000 epoch | |
Right ascension | 01h 00m 00s[1] |
Declination | +60° 59′[1] |
Distance | 10,500 ± 2,100[2] ly |
Apparent dimensions (V) | 2°[3] |
Constellation | Cassiopeia |
See also: Lists of nebulae |
This H II region includes the reflection and emission nebulae IC 59 and IC 63.[4] Both nebulae have a cometary shape, with IC 63 being the brighter of the two.[6] The difference in appearance between the two nebulae is a consequence of their physical distance from γ Cas. IC 63 displays a well-defined ionization front, while this is lacking in IC 59.[5] The nebulae are the closest photodissociation regions to the Sun.[6]