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trevboyd

M71? August 24

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I think this is M71 in Sagitta, but having checked it against the photo on SEDS, I'm not 100% sure...

http://www.seds.org/messier/m/m071.html

This is the first time I've seen this object - not one of the more famous Messiers!

Canon 350D, C8-N

9x30s @ ISO-1600

7927_normal.jpeg

(click to enlarge)

Trev

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Compared the star field on SN pro 4 and it definitely fits. North is towards the right of the image. The bright star at the bottom is 9-sagittae

I saw this one last night also for the first time - I like it. I resolved it fully with averted vision. It looks like an open cluster at low magnification because it's so loose for a glob.

Nice shot, by the way!

Andrew

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Nice image Trev. Nicely focused and good tracking.

I too looked at this a few nights (or was it weeks) ago and resolved it with averted vision. A nice little cluster.

I also had a play with the image, hope you don't mind? I'm not skilled at this, haven't done it for a few years. Just wanted to try and darken the background sky.

Russ

post-12650-133877345551_thumb.jpg

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Yes it is definitely M71. Your image has North at the right, the SEDS page has North at the bottom, so rotate yours 90° clockwise to match up. I had a go at this last year and also felt it looked more like an open cluster than a glob.: in fact it reminds me most of a fainter version of M11.

This is a very nice clear image, excellent focus and tracking, but I'd like to see it with more colour, especially considering its location in the thick of the MW. I picked up quite a lot of colour in attempt with the 350D: try increasing the saturation before clipping the black point, perhaps?

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M71 is a bit like M56 in Lyra. Both appear like small, tight open clusters rather than a globular.

I think Trev has a lot more information in his original image. I pushed the Jpg downloaded from here and the image was loaded with hundreds more stars.

Russ

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Thanks for the comments, everyone.

I've had another play with it to try and darken the background a little more like Russ', but keep some colours:

7928_normal.jpeg

(click to enlarge)

The raw stacked TIFF is at http://www.trevboyd.com/images/content/AstroPhotos/M71-2008-08-24-stack-9-4m30s.TIF if anyone is interested - it has more colour, but has a really bad gradient. I think its from the streetlight outside my garden wall :)

Trev

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Sorry for spamming the thread, but I've had another go. This time, I discovered that my "GradientXTerminator" filter hasn't expired in PhotoShop, so I used that to remove the red gradient rather than PixInsight. It seems to have done a much better job, producing much less of a purple cast to the image, allowing me to darken the sky and keep the "proper" star colours.

7930_normal.jpeg

(click to enlarge)

Last one, I promise! :)

Trev

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Ooo! It's let darken the background time! :)

Heres my take on the image.

Sorry Trev.

CW

Click as usual.

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