APOD: Central Cygnus Skyscape (2015 Aug 19)

Comments and questions about the APOD on the main view screen.
User avatar
APOD Robot
Otto Posterman
Posts: 3543
Joined: Fri Dec 04, 2009 3:27 am

APOD: Central Cygnus Skyscape (2015 Aug 19)

Post by APOD Robot » Wed Aug 19, 2015 4:09 am

Image Central Cygnus Skyscape

Explanation: In cosmic brush strokes of glowing hydrogen gas, this beautiful skyscape unfolds across the plane of our Milky Way Galaxy and the center of the northern constellation Cygnus the Swan. The featured image spans about six degrees. Bright supergiant star Gamma Cygni (Sadr) to the upper left of the image center lies in the foreground of the complex gas and dust clouds and crowded star fields. Left of Gamma Cygni, shaped like two luminous wings divided by a long dark dust lane is IC 1318, whose popular name is understandably the Butterfly Nebula. The more compact, bright nebula at the lower right is NGC 6888, the Crescent Nebula. Some distance estimates for Gamma Cygni place it at around 1,800 light-years while estimates for IC 1318 and NGC 6888 range from 2,000 to 5,000 light-years.

<< Previous APOD This Day in APOD Next APOD >>
[/b]

User avatar
Ann
4725 Å
Posts: 9506
Joined: Sat May 29, 2010 5:33 am

Re: APOD: Central Cygnus Skyscape (2015 Aug 19)

Post by Ann » Wed Aug 19, 2015 4:18 am

APOD Robot wrote:
Some distance estimates for Gamma Cygni place it at around 750 light-years while estimates for IC 1318 and NGC 6888 range from 2,000 to 5,000 light-years.
We wait for Gaia. :yes:

Ann
Color Commentator

henrystar
Ensign
Posts: 97
Joined: Sun Feb 28, 2010 11:40 am

Re: APOD: Central Cygnus Skyscape (2015 Aug 19)

Post by henrystar » Wed Aug 19, 2015 12:16 pm

So much better than waiting for Godot!

johnemac

Re: APOD: Central Cygnus Skyscape (2015 Aug 19)

Post by johnemac » Wed Aug 19, 2015 1:04 pm

Dr Kaler's "stars" website gives a Sadr distance of 1830 (+ or - 280) ly - is he wrong??

whatsupdoc
Asternaut
Posts: 2
Joined: Wed Aug 19, 2015 1:12 pm

Re: APOD: Central Cygnus Skyscape (2015 Aug 19)

Post by whatsupdoc » Wed Aug 19, 2015 1:15 pm

What is the perfectly circular bubble to the lower left of NGC 6888, the Crescent Nebula :?:

starsurfer
Stellar Cartographer
Posts: 3522
Joined: Thu Mar 15, 2012 7:25 pm

Re: APOD: Central Cygnus Skyscape (2015 Aug 19)

Post by starsurfer » Wed Aug 19, 2015 2:07 pm

whatsupdoc wrote:What is the perfectly circular bubble to the lower left of NGC 6888, the Crescent Nebula :?:
This is a planetary nebula with the lovely name of the Soap Bubble Nebula. Interestingly it was discovered in 2008 by the amateur astronomer Dave Jurasevich.

User avatar
Ann
4725 Å
Posts: 9506
Joined: Sat May 29, 2010 5:33 am

Re: APOD: Central Cygnus Skyscape (2015 Aug 19)

Post by Ann » Wed Aug 19, 2015 2:08 pm

whatsupdoc wrote:What is the perfectly circular bubble to the lower left of NGC 6888, the Crescent Nebula :?:
Maybe a small faint planetary nebula?

Ann
Color Commentator

starsurfer
Stellar Cartographer
Posts: 3522
Joined: Thu Mar 15, 2012 7:25 pm

Re: APOD: Central Cygnus Skyscape (2015 Aug 19)

Post by starsurfer » Wed Aug 19, 2015 2:20 pm

APOD Robot wrote:In cosmic brush strokes of glowing hydrogen gas
There is also a bit of oxygen in this region, most notably associated with the Crescent Nebula.

User avatar
Chris Peterson
Abominable Snowman
Posts: 14338
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Central Cygnus Skyscape (2015 Aug 19)

Post by Chris Peterson » Wed Aug 19, 2015 3:17 pm

johnemac wrote:Dr Kaler's "stars" website gives a Sadr distance of 1830 (+ or - 280) ly - is he wrong??
That's the Hipparcos parallax distance, which is probably a lot more accurate than the value given in today's caption (which is closer to the distance in parsecs, not light years, though a bit on the high side). Most Hipparcos distances are pretty accurate, although there are significant errors with some measurements. As Ann suggests, the Gaia data will confirm or correct many current distance values.
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

whatsupdoc
Asternaut
Posts: 2
Joined: Wed Aug 19, 2015 1:12 pm

Re: APOD: Central Cygnus Skyscape (2015 Aug 19)

Post by whatsupdoc » Wed Aug 19, 2015 4:27 pm

starsurfer wrote:
whatsupdoc wrote:What is the perfectly circular bubble to the lower left of NGC 6888, the Crescent Nebula :?:
This is a planetary nebula with the lovely name of the Soap Bubble Nebula. Interestingly it was discovered in 2008 by the amateur astronomer Dave Jurasevich.
Thanks, starsurfer.

Visual_Astronomer

Re: APOD: Central Cygnus Skyscape (2015 Aug 19)

Post by Visual_Astronomer » Wed Aug 19, 2015 4:36 pm

I was observing this very region Monday night. Unfortunately, most of the gas and dust is too faint to see, but the Crescent Nebula is readily visible through a narrow-band filter and is quite interesting.

User avatar
RJN
Baffled Boffin
Posts: 1491
Joined: Sat Jul 24, 2004 1:58 pm
Location: Michigan Tech

Re: APOD: Central Cygnus Skyscape (2015 Aug 19)

Post by RJN » Wed Aug 19, 2015 7:00 pm

Chris Peterson wrote:
johnemac wrote:Dr Kaler's "stars" website gives a Sadr distance of 1830 (+ or - 280) ly - is he wrong??
That's the Hipparcos parallax distance, which is probably a lot more accurate than the value given in today's caption.
Thanks! Fixed it. - RJN

User avatar
Ron-Astro Pharmacist
Resistored Fizzacist
Posts: 889
Joined: Thu Jan 03, 2013 10:34 pm
AKA: Fred
Location: Idaho USA

Re: APOD: Central Cygnus Skyscape (2015 Aug 19)

Post by Ron-Astro Pharmacist » Wed Aug 19, 2015 7:01 pm

What a great image made even more spectacular when you double-click on it. Sometimes I forget to look at it this way which would have resulted in missing a lot of detail including the Soap Bubble Nebula. The links are a key part too in viewing the Astronomy Picture of the Day.

Being a photography neophyte – why are some APOD's "clickable" to reveal higher detail while others aren't? The file sizes submitted by the photographer or are there other factors involved?
Make Mars not Wars

User avatar
MarkBour
Subtle Signal
Posts: 890
Joined: Mon Aug 26, 2013 2:44 pm
Location: Illinois, USA

Re: APOD: Central Cygnus Skyscape (2015 Aug 19)

Post by MarkBour » Wed Aug 19, 2015 7:47 pm

This is a gorgeous image!

I'm wondering about the appearance of halos around Gamma Cygni in this image. There is an inner one that appears perfectly spherical, a little larger in visual size than the soap bubble nebula. Outside of that is an incomplete arc, looking somewhat like a capital letter "G". Even beyond that are other wisps that may be more of the same, whatever it is.
Mark Goldfain

User avatar
RJN
Baffled Boffin
Posts: 1491
Joined: Sat Jul 24, 2004 1:58 pm
Location: Michigan Tech

Re: APOD: Central Cygnus Skyscape (2015 Aug 19)

Post by RJN » Wed Aug 19, 2015 7:55 pm

Ron-Astro Pharmacist wrote: why are some APOD's "clickable" to reveal higher detail while others aren't? The file sizes submitted by the photographer or are there other factors involved?
Yes, it is mostly submitted file sizes. - RJN

Boomer12k
:---[===] *
Posts: 2481
Joined: Sun Apr 22, 2007 12:07 am

Re: APOD: Central Cygnus Skyscape (2015 Aug 19)

Post by Boomer12k » Wed Aug 19, 2015 8:35 pm

A giant Gila-Scorpion thingy, and a Giant Moustachioed Genie.... a nasty fish face, and I am sure others, if your pareidolia is up for it...:-)

Really awesome image...

:---[===] *

Hans Vonk

Re: APOD: Central Cygnus Skyscape (2015 Aug 19)

Post by Hans Vonk » Thu Aug 20, 2015 11:25 am

I was pleased to see that the explaining text indicated the span of degrees of the image. It would be nice if this could happen more often.