Sammanfattning

This image shows Alnilam lighting up NGC 1990. The photo was taken by Glen Youman of the website astrophotos.net. As of March 2004, the image is also available at http://astrophotos.net/images/nebula/ngc1990.jpg .

The page http://astrophotos.net/pages/Nebula/NGC%201990.htm lists the following information about the image:

NGC 1990 Orion Foresthill, California December 1998 FS-128G (ag, ST-4) hPJ400, stack of two 45 minute exposures

NGC 1990 surrounds the belt star Epsilon Orionis. This reflection nebula is of such low magnitude as to be invisible in all but the larger scopes. There are two very faint detached reflection nebulae in the lower left of the photo, my star charts do not identify these nebulae.

Copyright information

Tillstånd ges att kopiera, distribuera och/eller modifiera detta dokument under villkoren i GNU Free Documentation License, Version 1.2 eller senare version publicerad av Free Software Foundation, utan oföränderliga avsnitt, framsidestexter eller baksidestexter. En kopia av licensen ingår i avsnittet GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

	Denna fil har gjorts tillgänglig under licensen Creative Commons Erkännande-Dela Lika 3.0 Generisk
	Du är fri: att dela – att kopiera, distribuera och sända verket att remixa – att skapa bearbetningar På följande villkor: erkännande – Du måste ge lämpligt erkännande, ange en länk till licensen och indikera om ändringar har gjorts. Du får göra det på ett lämpligt sätt, men inte på ett sätt som antyder att licensgivaren stödjer dig eller din användning. dela lika – Om du remixar, transformerar eller bygger vidare på materialet måste du distribuera dina bidrag under samma eller en kompatibel licens som originalet.
	Detta licenstillägg lades till till denna fil som en del av GFDL:s licensuppdatering.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue

The following email confirms that the image is under the GFDL. Email addresses have been modified to prevent spam.

 Date: Wed, 24 Mar 2004 07:17:51 -0800 (PST)
 From: Glen Youman <gyouman at sbcglobal.net>
 To: William T. Mahan <wtm2 at duke.edu>
 Subject: Re: Request to redistribute one of your photos

 Mr. Mahan-
  
 You have my permission to use and redistribute any and all of my web-site
 images under the conditions you have listed in your subject e-mail.
  
 NGC 1990 was a film based image.  I no longer have access to a negative scanner
 but if you need to rescan the image, I will gladly mail the original negative.
 
 "William T. Mahan" <wtm2 at duke.edu> wrote:
 Dear Mr. Youman,
 
 I wanted to let you know that I enjoyed your astronomy photos at
 astrophotos.net. I found it by searching Google for a star I wanted
 images of, while doing research for the free online encyclopedia
 "Wikipedia". I thought that your images (and one in particular) might
 be worthy of inclusion in our growing document.
 
 Wikipedia (http://www.wikipedia.org) is a free encyclopedia that is
 collaboratively edited by volunteers from around the world. Our goal is
 to create a comprehensive knowledge base that is not only available at
 no charge, but is also freely distributed.

 I am specifically seeking your permission to use your photo of NGC 1990
 for an article I am writing about Epsilon Orionis:
 http://www.astrophotos.net/images/nebula/ngc1990.jpg

 I'd like to include your image in this article:
 http://www.wikipedia.org/wiki/Alnilam . (To get a sense of the freedom
 of Wikipedia, you yourself can edit this page without registration,
 right now!)

 We can only use your materials if you are willing to grant permission
 for it to be used under terms of the GNU Free Documentation License.
 This means that although you retain the copyright and authorship of your
 own work, you are granting permission for all others (not just
 Wikipedia) to use, copy, and share your materials freely -- and even
 potentially use them commercially -- so long as they do not try to claim
 the copyright themselves, or try to prevent others from using or copying
 them freely.

 You can read this license in full at:
 http://www.wikipedia.org/wiki/Wikipedia:Text_of_the_GFDL
 (note: To keep things simple, we don't use Invariant Sections,
 Front-Cover Texts, or Back-Cover Texts)

 This license also expressly protects creators "from being considered
 responsible for modifications made by others" while ensuring that
 creators get credit for their work. There is more information on our
 copyright policy at:
 http://www.wikipedia.org/wiki/Wikipedia:Copyrights

 We chose the GNU FDL license because it is the best available tool for
 ensuring that our encyclopedia is and can remain free for all to use,
 and for providing credit to everyone that donates text and images. It
 may or may not be compatible with your goals in creating the materials
 available on your website -- that's for you to choose. Please be assured
 that if permission is not granted, your original materials will *not* be
 used at Wikipedia -- we have a very strict policy against copyright
 violations.

 If you agree, we will credit you for your work in the image's permanent
 Description Page, noting that it is your work and is used with your
 permission, and we will provide a link back to your website.

 Thank you for your time.

 Kindly,
 Wil Mahan

 ---------------------
 Glen Youman
 Penryn, California
 http://www.astrophotos.net/ - Home page
 http://www.penryn-esd.k12.ca.us/ -Penryn School
 http://astro.sci.uop.edu/~sas/ -Stockton Astronomical Society
 http://www.darksky.org - International Darksky Association

Licensiering

Tillstånd ges att kopiera, distribuera och/eller modifiera detta dokument under villkoren i GNU Free Documentation License, Version 1.2 eller senare version publicerad av Free Software Foundation, utan oföränderliga avsnitt, framsidestexter eller baksidestexter. En kopia av licensen ingår i avsnittet GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

	Denna fil har gjorts tillgänglig under licensen Creative Commons Erkännande-Dela Lika 3.0 Generisk
	Du är fri: att dela – att kopiera, distribuera och sända verket att remixa – att skapa bearbetningar På följande villkor: erkännande – Du måste ge lämpligt erkännande, ange en länk till licensen och indikera om ändringar har gjorts. Du får göra det på ett lämpligt sätt, men inte på ett sätt som antyder att licensgivaren stödjer dig eller din användning. dela lika – Om du remixar, transformerar eller bygger vidare på materialet måste du distribuera dina bidrag under samma eller en kompatibel licens som originalet.
	Detta licenstillägg lades till till denna fil som en del av GFDL:s licensuppdatering.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue