Sh2-27 – The Zeta Ophiuchi Nebula (Western Region)
April 1, 2023
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Sh2-27 is an emission region in the Ophiuchus constellation. It lies approximately 440 light years from Earth. It’s ionized, and therefore visible to us, by the star Zeta Ophiuchi (ζ Oph). From our point of view, Sh2-27 is one of the largest nebulas in the sky because of its relatively close proximity to us. Even this two-panel mosaic fails to capture all of it.
One notable thing about the ionizing star ζ Oph (also known as Khan) is that it is a runaway star ploughing through Sh2-27. This has created a large bow shock visible in blue on the left side of the frame.
Image Capture
Location:
Back yard in North Dallas
Camera:
Total integration: 47h 48m 30s
Integration per filter:
- R: 1h 12m (144 × 30")
- G: 1h 13m (146 × 30")
- B: 1h 49m 30s (149 × 30")
- Hα: 14h 57m (299 × 180")
- S2: 14h 30m (290 × 180")
- O3: 14h 42m (294 × 180")
Coordinates: 16h 31m 20s · -9° 46′ 48″
ZWO ASI6200MM-Pro
Finding Chart
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Telescope
William Optics ZenithStar 61
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