Surprise Swan (Brian Boyle)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: Checkmark Nebula · IC 4706 · IC 4707 · LBN 60 · Lobster Nebula · M 17 · NGC 6618 · Sh2-45 · Swan Nebula · omega Nebula

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Surprise Swan

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Surprise Swan

I was not intending to post last night's efforts. It was mainly intended as a test of using my new ASI6200MM with my 0.67x reducer on the RC8 - to see how far off-axis I could go without distortion. As it turns out the answer is - not very. A 16mm diameter image circle at best; poorly matched to the full frame ASI6200MM.

I now know that a flattener is the priority if I am to match my 6200MM to the RC8. Since it turns that there are not too many flattener/reducers out there, I am going to go back to the native f/8 of my RC8 and binx2 on the 6200MM to get a better match of image scale (1arcsec/bin) to my seeing here. So I also experimented with binning up.

With all this playing around, I wasn't too upset when clouds rolled in with only three [OIII] subs taken (15mins). I processed the [OIII] more out of completeness than anything else - not interring to make an image out of it. But I was very surprised when I saw the result. About the only way I could tell that the [OIII] day was not up to scratch was the blue halo around the bright star, courtesy of the high cloud that rolled in. The QE of this camera is certainly impressive, helped of course by the amount of H and S data I had already collected - the H acting as a pseudo-luminance. Binning up also helped, the RC8 with 0.67x reducer effectively running at f/2.7 and I do have to good fortune to observe under Bortle 3 skies

Its far from the best Swan out there, but it not an ugly duckling either. I will upload a revision when I manage to get more [OIII], but I thought people might be interested what you can get away with.

HA: 30 x 300s

[SII]: 30 x 300s

[OIII]: 3 x 300s

New Zealand Astrophotography
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Status	Advanced success
Started	...
Astrometry.net job	8999909
PixInsight job	4QZJ34YNGMF7TQ2J62D6QYYPGK0IOETV
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	18h20m36s.97
RA (top/left)	18h22m05s.33
RA (top/right)	18h18m09s.72
RA (bottom/right)	18h19m08s.18
RA (bottom/left)	18h23m04s.64

Dec (center)	-16°08′57″.6
Dec (top/left)	-15°37′34″.10
Dec (top/right)	-15°55′26″.9
Dec (bottom/right)	-16°40′17″.8
Dec (bottom/left)	-16°22′23″.7

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