mud map

[Peter Ward]

Given the popularity of the many great H-alpha regions that bless southern skies this time of year,I thought this road map (an old link that I posted some years ago) might be useful

H-alpha is here (http://www.atscope.com.au/BRO/gallery106.html)

[atalas]

Very cool Peter:thumbsup: some nice targets to go after.

[Placidus]

That's wonderful, Peter.

If one draws a line from Swan to Eagle and continues about the same distance in the same direction (generally 7 o'clock) one comes to a big bright lump of nebulosity that I'm entirely unfamiliar with, perhaps because it's well to the North, but looks like it should be famous. On your image the brightest patch is at pixel coordinates (637, 4932) referenced to top left. Any idea what it is?

Best,
Mike

[Peter Ward]

Ta M&T . I suspect the mystery object is NGC6604 :thumbsup:

[Ryderscope]

What a great mud map Peter. Thank you.

[multiweb]

I remember that one. An oldie but a goodie. :thumbsup::thumbsup::thumbsup:

[Peter Ward]

Thanks Mark...hard to believe I did this back in 2011. Might be time for a redo with the AP130 :question:

[pfitzgerald]

Hi Mike/Trish

The nebulosity that you're referring to is Gum 85 and was the last of 85 H-alpha regions mapped by Australian astronomer Colin Gum as part of his PHd thesis back in the mid 1950's.

An image of it taken by the Gemini South telescope can be found here:

https://www.aao.gov.au/itso/outreach/GeminiContest

If you're interested please contact me via a PM and I can provide you with the rest of the details!

Paul

[Andy01]

Hi Peter, nice image & a great field!

Regarding Mike’s mysterious object mentionsed above, I thought that was SH2-54? The bright nebula within is Gum-85. The ring around it is Gum-84.
Together, they are called the "nested egg" nebula.
The cluster below is NGC6604.
M16 is bottom of frame in this image I took two years ago.- https://www.astrobin.com/full/255908/0/

Lots of great targets up there for Ha fans :thumbsup:

[Peter Ward]

I am happy to stand corrected here, Mike's co-ordinates refer to the object pointed to, on the attached crop.

M16 can be seen top right

I thought this was emission nebula NGC6604....in any event, a rose by any other name works for me :)

[theodog]

Firstly,
Really nice wide-field Ha Peter. Can't wait to see the expanded version.:thumbsup:
(though please warn us of the size for looking):eyepop:

Secondly, Paul and Andy are right. The neb arrowed is Gum85 (identified by SIMBAD) and NGC6604 is the open cluster seen above in the image (identified in Guide 9).:thumbsup:

[Peter Ward]

Fair enough. Gum 85 it is then :thumbsup:

[Retrograde]

By gum that's amazing.
Thanks for reposting. I missed it the first time round.