Sh2-155, Cave Nebula, Hα, 12 Sep 2014 (David Dearden)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: Sh2-155

Sh2-155, Cave Nebula, Hα, 12 Sep 2014

Extremely good conditions. Lots of moonlight, but who cares when using the Hα filter! Chiller at 6.5 °C, 2.5 A. Found easily with the PicGoto from iota Cephei. Got about 70 min of data, did a meridian flip, and continued. Unfortunately, the imaging run hung up about half an hour after I went to bed, so I got a lot less data than I had planned for. This is two runs in a row with this problem so I need to get it sorted. The image turned out much better than I expected. Woo-hoo to the Hα filter!

Date: 12 Sep 2014

Subject: Sh2-155, Cave Nebula

Scope: AT8IN+0.5x Antares telereducer

Filter: Baader Planetarium 7 nm H-α

Mount: CG-5 (Synta motors, PicGoto Simplificado)

Guiding: 9x50 Finder/Guider + DSI Ic + PHD 2.3.0 (Win 7 ASCOM)

Camera: DSI IIc chiller at 2.50 A, 6.5 °C

Acquisition: Nebulosity 3.2.1, no dither

Exposure: 11x600 s

Stacking: Neb 3, bad pixel map, bias included, extract R, normalize, square, trans+rot align, 1.5 SD stack, resize 2x (Catmull-Rom).

Processing: StarTools 1.3.5.279 Crop; Develop 75.00%; HDR:Equalize; Deconvolute 3.7 pix; Life:Moderate; Track:RNC 0.01%; CC 2014 Photoshop AstronomyTools B&W to Hα; Healing brush to remove a hot spot trail; Astro Frame.

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Status	Advanced success
Started	...
Astrometry.net job	363345
PixInsight job	VDVDRZB6C3ZAE2E9OPNLI9G48B8ZLPNL
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	22h57m30s.83
RA (top/left)	23h00m40s.95
RA (top/right)	22h54m23s.20
RA (bottom/right)	22h54m21s.72
RA (bottom/left)	23h00m34s.26

Dec (center)	+62°31′42″.0
Dec (top/left)	+62°48′33″.9
Dec (top/right)	+62°48′36″.1
Dec (bottom/right)	+62°14′40″.2
Dec (bottom/left)	+62°14′24″.6

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Sh2-155, Cave Nebula, Hα, 12 Sep 2014

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