Another Antares Rho Ophiuchus

[rcheshire]

Auto-guiding is a nice recent addition and I had hoped to get more data this month. But we need the rain.

A little more work and this is as good as it's going to get. Originally posted in the beginners section.

2.1 hours, 240 second subs at ISO 200, under a bluish LED sky.

Read noise was a problem, mostly filtered out in StarTools Heal module using the Mono dead pixel mask option.

I find the inverted L* channel makes a good saturation mask for this region.

And I am quite happy with the preprocessing using my own scripts.

[RickS]

You've brought out a huge amount of nebulosity, Rowland!

[rcheshire]

Thanks Rick. Given complaints about LED street lighting, I'm surprised by the result. Lower ISO and longer exposures (another discussion) seem to improve the result in this case. I wasn't aiming for a pretty constrasty picture, more the success or otherwise failure of the technique to reveal detail vs read noise.

[multiweb]

Lots of colors and depth in that shot. Cool. :thumbsup:

[gregbradley]

A very vibrant image.

Greg.

[rcheshire]

Greg and Marc. Thank you for your comments...