NGC 7635, Bubble Nebula, Hα, 9 Aug 2014 (David Dearden)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: Bubble nebula · NGC 7635 · Sh2-162

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NGC 7635, Bubble Nebula, Hα, 9 Aug 2014

Full Moon (in fact Super Duper Moon if you believe the media!). You really can do this Hα stuff under a full Moon. There's still lots of haze in the air, but when I went out to check, things looked good enough to try so I did (besides, I left my gear out from last night so I didn't have to set up!). There's also quite a bit of gusty wind again. Anyway, the Bubble was easy to find from α Cas with the PicGoto and easy to recognize even with short exposures of a couple of seconds even with the filter. 2.5 A on the chiller has the CCD at 16 °C. I'm having a terrible time trying to do HαRGB and HαRRGB combinations. Maybe it's because I'm trying to use old RGB data that isn't very good. In any event, I don't have any that are suitable for the Bubble, so that will have to wait until the skies darken again.

Date: 9 Aug 2014

Subject: NGC 7635, Bubble 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, 16 °C

Acquisition: Nebulosity 3.2.0, no dither

Exposure: 24x600 s

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

Processing: StarTools 1.3.5.279 Crop; Wipe:Color & brightness 75%; Develop 70.97%; HDR:Equalize; Deconvolute 2.7 pix; Life:Moderate; Track RNC 79.41%; Magic:Shrink 1 pix. CS6 AstronomyTools deep space noise reduction; B&W to Hα; Astro Frame.

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Status	Advanced success
Started	...
Astrometry.net job	339562
PixInsight job	30J97QKONCK3AAY1M3ZYBUGSWPWW35MS
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	23h20m45s.93
RA (top/left)	23h23m55s.15
RA (top/right)	23h17m41s.35
RA (bottom/right)	23h17m40s.91
RA (bottom/left)	23h23m51s.52

Dec (center)	+61°10′00″.9
Dec (top/left)	+61°27′18″.8
Dec (top/right)	+61°28′03″.6
Dec (bottom/right)	+60°52′25″.5
Dec (bottom/left)	+60°51′34″.2

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NGC 7635, Bubble Nebula, Hα, 9 Aug 2014

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NGC 7635, Bubble Nebula, Hα, 9 Aug 2014

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