NGC7635, NGC 7538 & Sh2-157 – The Bubble, Northern Lagoon & Lobster Claw Nebula

NGC7635 / 7538 & Sh2-157

The Bubble, Northern Lagoon & Lobster Claw Nebula

About 3 degrees on the sky

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Adrift in a cosmic sea of stars and glowing gas the delicate, floating apparition left of center in this widefield view is cataloged as NGC 7635, the Bubble Nebula. A mere 10 light-years wide, the tiny Bubble Nebula was blown by the winds of a massive star. It lies within a larger complex of interstellar gas and dust clouds found about 11,000 light-years distant, straddling the boundary between the parental constellations Cepheus and Cassiopeia. Above and right of the Bubble Nebula is an emission region identified as Sh2-157, also known as the Claw Nebula. Constructed from 20 hours of narrow-band, this image spans about 3 degrees on the sky. That corresponds to a width of 500 light-years at the estimated distance of the Bubble Nebula.

Bubble, Northern Lagoon & Claw in Cassiopeia

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Technical card

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ObjectNGC 7635 / NGC 7538 / Sh2-157
Imaging telescopeCelestron Rowe-Ackermann Schmidt Astrograph 8″
Imaging cameraZWO ASI 1600MM PRO
Mount iOptron CEM60
GuidingGuidescope 240mm, ZWO ASI 120MM
FilterBaader f/2 Highspeed H-Alpha, Baader f/2 Highspeed OIII, Baader f/2 Highspeed SII (each 2″)
AccessoriesStarizona Filter Slider,  Celestron Focus Motor for SCT
Integration20.8 hours, H-Alpha: 258×100″, OIII: 250×100″, SII: 241×100″
Dates of recordingOct. 15, 2019,  Oct. 25, 2019,  Oct. 26, 2019
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