Location/ Date: |
Eggersdorf, 21.+22. August.2019 |
Telescope/ Lens: |
TS ONTC Newton f/4 |
Mount: |
ASA 60 DDM Pro |
Camera: |
Atik 383L+ |
Exposure time/ Filter: |
30x 1200" Astronomik Ha 6nm |
Total exposure: |
10 hours |
Description: |
Sh2-135 is a visible emission nebula in the constellation Cepheus.
It is located in the southern part of the constellation, north of the line connecting the stars ζ Cephei and δ Cephei. It is an H II region connected to a dark nebula of interstellar dust, which has a distinct and expanding ionization front. A model that can explain the situation well is the so-called blister model: according to this scheme, the ionized gas is swept away from the ionization front by the interaction between the H II region and the adjacent molecular cloud. The star responsible for the ionization of the gas has the spectral class O9.5V; the distance estimates give a value of about 1900 parsecs (about 6200 light years). Around this nebula, IRAS has identified numerous sources of infrared radiation, indicating the presence of more recent star formation processes |
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