APOD: Pelican Nebula Close Up (2011 Nov 26)

Comments and questions about the APOD on the main view screen.
User avatar
APOD Robot
Otto Posterman
Posts: 5454
Joined: Fri Dec 04, 2009 3:27 am

APOD: Pelican Nebula Close Up (2011 Nov 26)

Post by APOD Robot » Sat Nov 26, 2011 5:06 am

Image Pelican Nebula Close Up

Explanation: The prominent ridge of emission featured in this vivid skyscape is designated IC 5067. Part of a larger emission nebula with a distinctive shape, popularly called The Pelican Nebula, the ridge spans about 10 light-years and follows the curve of the cosmic pelican's head and neck. The Pelican Nebula close-up was constructed from narrowband data mapping emission from sulfur, hydrogen, and oxygen atoms to red, green, and blue colors. Fantastic, dark shapes inhabiting the view are clouds of cool gas and dust sculpted by energetic radiation from young, hot, massive stars. But stars are also forming within the dark shapes. In fact, twin jets emerging from the tip of the long, dark tendril below center are the telltale signs of an embedded protostar cataloged as Herbig-Haro 555. The Pelican Nebula itself, also known as IC 5070, is about 2,000 light-years away. To find it, look northeast of bright star Deneb in the high flying constellation Cygnus.

<< Previous APODDiscuss Any APOD Next APOD >>
[/b]

User avatar
Beyond
500 Gigaderps
Posts: 6889
Joined: Tue Aug 04, 2009 11:09 am
Location: BEYONDER LAND

Re: APOD: Pelican Nebula Close Up (2011 Nov 26)

Post by Beyond » Sat Nov 26, 2011 5:25 am

I couldn't see a Pelican anywhere. Not even in the zooming link. I think it went fishing.
To find the Truth, you must go Beyond.

User avatar
alter-ego
Serendipitous Sleuthhound
Posts: 1121
Joined: Mon Apr 21, 2008 4:51 am
Location: Redmond, WA

Re: APOD: Pelican Nebula Close Up (2011 Nov 26)

Post by alter-ego » Sat Nov 26, 2011 6:28 am

Beyond wrote:I couldn't see a Pelican anywhere. Not even in the zooming link. I think it went fishing.
Image

The head reminds me of a pterodactyl too.
A pessimist is nothing more than an experienced optimist

Boomer12k
:---[===] *
Posts: 2691
Joined: Sun Apr 22, 2007 12:07 am

Re: APOD: Pelican Nebula Close Up (2011 Nov 26)

Post by Boomer12k » Sat Nov 26, 2011 8:28 am

Looks like a Minotaur. You can see a shoulder and head, and mouth and horns....the Minotaur Nebuala???


:---[===] *

nstahl
Science Officer
Posts: 233
Joined: Mon Nov 29, 2004 4:08 am

Re: APOD: Pelican Nebula Close Up (2011 Nov 26)

Post by nstahl » Sat Nov 26, 2011 12:21 pm

You're looking at a close-up; in fact a little piece of the pelican. To see the pelican follow the "Pelican Nebula" link. I think we're seeing the top of its head, but in a different kind of view.

Very nice APOD.

User avatar
Ann
4725 Å
Posts: 13597
Joined: Sat May 29, 2010 5:33 am

Re: APOD: Pelican Nebula Close Up (2011 Nov 26)

Post by Ann » Sat Nov 26, 2011 12:36 pm

I'd say we are seeing the "ionization front" in the Pelican's neck, though turned another way than in a "classic" image of the Pelican Nebula.

Ann
Color Commentator

User avatar
orin stepanek
Plutopian
Posts: 8200
Joined: Wed Jul 27, 2005 3:41 pm
Location: Nebraska

Re: APOD: Pelican Nebula Close Up (2011 Nov 26)

Post by orin stepanek » Sat Nov 26, 2011 2:14 pm

I couldn't use the zoom video unless I downloaded an addition to real! :cry:
Orin

Smile today; tomorrow's another day!

User avatar
neufer
Vacationer at Tralfamadore
Posts: 18805
Joined: Mon Jan 21, 2008 1:57 pm
Location: Alexandria, Virginia

Re: APOD: Pelican Nebula Close Up (2011 Nov 26)

Post by neufer » Sat Nov 26, 2011 2:36 pm

APOD Robot wrote:
<<Stars are also forming within the dark shapes. In fact, twin jets emerging from the tip of the long, dark tendril below center are the telltale signs of an embedded protostar cataloged as Herbig-Haro 555.>>
http://en.wikipedia.org/wiki/555_timer_IC wrote:
Image
<<The 555 timer IC is an integrated circuit (chip) used in a variety of timer, pulse generation and oscillator applications. The part is still in widespread use, thanks to its ease of use, low price and good stability. As of 2003, it was estimated that 1 billion units are manufactured every year. The IC design was proposed in 1970 by Hans R. Camenzind and Jim Ball. After prototyping, the design was ported to the Monochip analogue array, incorporating detailed design by Wayne Foletta and others from Qualidyne Semiconductors. Signetics (later acquired by Philips) took over the design and production,
and released the first 555s in 1971.>>
http://en.wikipedia.org/wiki/555_%28telephone_number%29 wrote: <<Telephone numbers with the prefix 555 are widely used for fictitious telephone numbers in North American television shows, films, computer games, and other media. Not all numbers that begin with 555 are fictional—for example, 555-1212 is one of the standard numbers for directory assistance throughout the United States and Canada. In fact, only 555-0100 through 555-0199 are now specifically reserved for fictional use - except for the 800 area code where only 800-555-0199 is reserved - and the other numbers have been released for actual assignment.

The phone companies began encouraging the producers of television shows and movies to use the 555 prefix for fictional telephone numbers, roughly during the 1960s. One of the earliest uses of a 555 number can be seen in Panic in Year Zero! (1962), with 555-2106. In older television shows from the 1950s or 1960s, "KLondike 5" or "KLamath 5" was used, as at the time the telephone exchanges used letters and numbers in phone numbers. More recent works set in this period typically use this convention as well. For example, in Back to the Future Dr. Emmett Brown's 1955 phone number is "KLondike 5-4385" while the 1985 Jennifer Parker character writes the number 555-4823 on the clock tower flier telling Marty to call her at her grandmother's. In 2011, the fictional Netflix Relief Fund satirized the company's price increase of that year and used the fictional number 1-555-368-7147.

Before "555" or "KLondike-5" gained broad usage, and before touchtone phones became standard, scriptwriters would sometimes invent fake exchanges starting with words like "QUincy" or "ZEbra". The letters "Q" and "Z" were not used on the old dial phones.

In the Seinfeld episode The Pool Guy, Kramer gets a new phone number which is 555-FILK, which he keeps getting wrong numbers from with 555-FILM (movie phone). Many times in Rugrats, the number 555-5555 is used. It's used for many businesses and places in the show.

In addition, 555 use is only restricted in North America. Neglecting this fact resulted in a lawsuit in the late 1980s: in his daily The Far Side panel, cartoonist Gary Larson included a graffiti of a 555 number by which prank calls could be made to Satan. When the panel was printed in Australia (where 555 was at the time a standard exchange), the owner of the 555 number became the subject of much harassment, and sued Larson and his syndicate for defamation. The suit was unsuccessful.

555 numbers are mentioned in the 1993 action film The Last Action Hero, starring Arnold Schwarzenegger. The character of Danny Madigan (played by Austin O'Brien) tries to convince Schwarzenegger's character that he is inside a movie by pointing out that 555 numbers give at most 9,999 possible telephone numbers(although there are technically 10,000 possible phone numbers: 0000-9999), clearly not enough for all phone users in Los Angeles. Schwarzenegger's character replies that area codes would solve that problem and O'Brien's character drops the subject.>>
Art Neuendorffer

JuanAustin
Ensign
Posts: 62
Joined: Thu Jun 16, 2005 3:11 pm

Re: APOD: Pelican Nebula Close Up (2011 Nov 26)

Post by JuanAustin » Sat Nov 26, 2011 3:16 pm

Have dark absorption clouds ever been considered as making up a significant amount of the so-called missing mass of the universe? They seem to be so impossibly difficult to detect against the back of empty space when it could be filled with it!
JuanAustin

User avatar
Chris Peterson
Abominable Snowman
Posts: 18387
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Pelican Nebula Close Up (2011 Nov 26)

Post by Chris Peterson » Sat Nov 26, 2011 3:41 pm

JuanAustin wrote:Have dark absorption clouds ever been considered as making up a significant amount of the so-called missing mass of the universe? They seem to be so impossibly difficult to detect against the back of empty space when it could be filled with it!
Dust clouds are only dark in visible light. In fact, they absorb that energy and re-radiate it in the infrared- which makes these clouds bright to infrared cameras. So dust is not generally considered a serious candidate for much of the missing mass.

"Missing mass" can be a somewhat ambiguous term, as in older literature it was also used to describe the unseen mass observed to influence galactic rotation. With the development of a solid theory of dark matter, missing mass no longer includes that. In current usage, missing mass refers to ordinary matter that is observed in the early Universe, but does not seem to be present in our local Universe- we see only about half of the ordinary matter we expect to see. However, it was recently announced that most or all of this missing mass appears to be accounted for by a vast amount of hot, low density material seen by the light of x-rays in intergalactic filaments. If this observation holds up (which seems likely), then the missing mass problem will no longer exist.
Chris

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

anabolicapple

Re: APOD: Pelican Nebula Close Up (2011 Nov 26)

Post by anabolicapple » Mon Nov 28, 2011 5:01 pm

as this is a narrow band image, does anyone know what the trail is in the upper right corner of the image? I thought that normal aircraft/satellite trails wouldn't show in narrow band - plus normally processed out? If someone could clarify then at least I'd have learnt something today...!
Cheers

ddorn777
Ensign
Posts: 28
Joined: Fri Aug 26, 2011 4:06 pm

Re: APOD: Pelican Nebula Close Up (2011 Nov 26)

Post by ddorn777 » Mon Nov 28, 2011 8:04 pm

My guess would be that it's just a diffraction spike from a cropped-out star that didn't make the cut in this picture.

anabolicapple

Re: APOD: Pelican Nebula Close Up (2011 Nov 26)

Post by anabolicapple » Wed Nov 30, 2011 3:27 am

aaah - of course - got it. Star just off right of image. Thanks!