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Giancarlo Melis

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Celestron RASA, ASI 183 MC Pro, IDAS NBZ


Sh2-132 is an faint emission nebula located in the constellation of Cepheus. It can be found on the southern edge of the constellation, near the border with Lizard, along the plane of the Milky Way. The best time for observing is between July and December, and it is particularly easy to observe for observers in the northern hemisphere. Sh2-132 is located at a distance of almost 3200 parsecs (about 10400 light-years), placing it within the Perseus Arm, in the region of Cepheus OB1, a large and bright OB association. The stars responsible for ionizing its gases are very hot and massive, in particular, two Wolf-Rayet stars with the codes HD 211564 and HD 211853 (the latter having also the code WR 153), in addition to a star of spectral class O8.5V and about ten B-class stars have been identified. Around the O-class star and one of the Wolf-Rayet stars, an easily visible bubble in the radio wave band extends and is identified as Shell B, probably originating from the stellar wind of the two massive stars. A similar structure, but smaller in size, Shell A, houses a K-class star near its center. It is believed that in the nebula, chain star formation processes have taken place in the past, but currently, there is no trace of recent activity. Nine sources of infrared radiation and a maser with H2O emissions have been identified in the direction of the nebula. This image was taken with my Celestron RASA 8 and the ASI 183-MC-Pro and is the result of the integration of 40 shots of 5 minutes each, taken with a narrow band double filter (Ha + OIII) IDAS NBZ and 30 shots of 10 seconds each, in wideband with Optolong L-Pro anti-pollution filter. I took the photos from my yard, from Barrali, a small town in southern Sardinia, Italy.