NGC 2841 Galaxy in Ursa Major

[schmeah]

This is a prototypical flocculent unbarred spiral galaxy in Ursa Major. Forty six million light years distant, apparent magnitude of 10. Shot over two nights with a QSI 540 wsg on 9.25 Edge and Avalon M Uno. Thanks for looking.

http://www.pbase.com/dsantiago/image/162030077

Derek

[Astroscot2]

A wonderful detailed image. I do like it,

[robmichael81]

Great image Derek, I'm still learning and am wondering what is meant by the term 'binned'? I noticed you took a certain amount of sub's and afterwards put binned' x2.

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[laudropb]

Cracking image. Lots of detail.

[schmeah]

Great image Derek, I'm still learning and am wondering what is meant by the term 'binned'? I noticed you took a certain amount of sub's and afterwards put binned' x2.

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Thanks guys! Rob, binning refers to a CCDs ability to combine adjacent pixels on the chip to make a "superpixel", in this instance effectively combining 4 pixels into 1. This increases the signal to noise ratio and thereby reduces the total imaging time needed. However, this also reduces the resolution which is related to pixel size. Many imagers bin their RGB subs because the detail in the image is not provided by the color subs, and can keep the detail by combining unbinned luminance subs. Binning luminance subs can make sense if your image scale resolution would be wasted if your atmospheric seeing conditions are not good, and therefore less resolution is acceptable.

Derek 

[wavydavy]

Very nice..........!