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Sh2-170 in Cassiopeia |
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| © Velimir Popov & Emil Ivanov 2020 | |||||||||||||||||||||||
| Size: 1800 px | |||||||||||||||||||||||
| Located close to the much more prominent NGC 7822, Sh2-170 is not a common imaging target out there these days. Тhis small Sharpless object is an H II region located on the Perseus Arm at about 2300 parsecs (about 7500 light years) away, near the edge of a large superbubble originating from the combined action of the stellar wind of the stellar association Cassiopeia OB5. The star responsible for ionizing its gases is known by the abbreviation BD + 63 2093; it is a main sequence star with spectral class O9V, belonging to the small and young open cluster Stock 18. The edges of the ionized region are mostly blurred, indicating a lower density on the periphery, except for the south-eastern side; the ionizing star is located near the center, on the front edge of a small isolated molecular cloud. It is believed that 40% of the mass of the complex is made up of monoatomic neutral hydrogen (HI), located beyond the ionization front. The infrared radiation source IRAS 00001 + 6417, observable in the direction of the nebula, corresponds to a molecular cloud with CO emissions probably located at a greater distance, around 4600 parsecs, although the Avedisova Catalog indicates it as related to Sh2-170. | |||||||||||||||||||||||
Image details:
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| Charts and image details obtained from Astrometry.net | |||||||||||||||||||||||
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| Copyright: Velimir Popov and Emil Ivanov 2020. All Rights Reserved | |||||||||||||||||||||||
| e-mail: info@irida-observatory.org | |||||||||||||||||||||||
