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Old 15-05-2018, 01:51 PM
Placidus (Mike and Trish)
Narrowing the band

Placidus is offline
 
Join Date: Mar 2011
Location: Euchareena, NSW
Posts: 3,719
NGC 5247 Virgo 4-armed spiral (gentler version)

This unassuming little Grand Design unbarred spiral is very rarely imaged.

Big version here.

Although ours isn't much, perhaps even awful, we believe it to be the fourth best in the world, mostly because it is small, faint, and no-one else has done it. There is your image, of course, which will be better. Then there is the ESO VLT image from Paranal in infrared, and a truly superb image from Capella observatory in the high desert in Namibia.

What ours does have: it is far deeper than the other three. Notice the broad, faint extension of the spiral toward six o'clock, which does not appear elsewhere.

Aspen CG16M on 20 inch PlaneWave. Lum 13.5 hrs, RGB 2 hrs each in 30 min subs. Image scale 0.55 sec arc / pixel.

Edit: First version was over-sharpened. Attached is a more natural-looking thumbnail. We've edited the full version in situ.

Best,
Mike and Trish
Attached Thumbnails
Click for full-size image (NGC 5247 Lum 13h30  RGB 2h each Thumb.jpg)
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Click for full-size image (NGC 5247 L 13h30 RGB 2hrs each more natural Thumb.jpg)
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Last edited by Placidus; 15-05-2018 at 03:26 PM.
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