NGC 2174 Monkey Head Nebula in Orion, John Leimgruber

NGC 2174 Monkey Head Nebula in Orion

NGC 2174 Monkey Head Nebula in Orion, John Leimgruber

NGC 2174 Monkey Head Nebula in Orion

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Description

An unusually transparent and still night at Green Lane Park, PA. Best PHD2 auto-guiding I've seen with my wind sail 8" Newt (0.5 to 0.8 arcsec RMS)... I used HCG but did *not* use the "High Fullwell Mode" as I wanted the lowest possible read noise ~1.4e-/pixel. The math to "swamp the read noise" suggested 2 minute subs would be long enough given a sky brightness of SQM-L 19.5~19.8, but I went for 3 minutes anyway hoping to reduce the noise in the darkest regions. Saturated a few hundred pixels or so, more with Oiii than Ha, but not too bad given no super bright stars in the area.

I used the same star treatment as my Rosette Nebula.

Cheers and Clear Skies!
-John "ubergarm"

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NGC 2174 Monkey Head Nebula in Orion, John Leimgruber