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
Vous avez la permission de copier, distribuer et modifier ce document selon les termes de la GNU Free Documentation License version 1.2 ou toute version ultérieure publiée par la Free Software Foundation, sans sections inaltérables, sans texte de première page de couverture et sans texte de dernière page de couverture. Un exemplaire de la licence est inclus dans la section intitulée GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue
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d’adapter – de modifier cette œuvre
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paternité – Vous devez donner les informations appropriées concernant l'auteur, fournir un lien vers la licence et indiquer si des modifications ont été faites. Vous pouvez faire cela par tout moyen raisonnable, mais en aucune façon suggérant que l’auteur vous soutient ou approuve l’utilisation que vous en faites.
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Ce bandeau de licence a été ajouté à ce fichier dans le cadre de la procédure de mise à jour des licences des images sous GFDL.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
Conditions d’utilisation
Vous avez la permission de copier, distribuer et modifier ce document selon les termes de la GNU Free Documentation License version 1.2 ou toute version ultérieure publiée par la Free Software Foundation, sans sections inaltérables, sans texte de première page de couverture et sans texte de dernière page de couverture. Un exemplaire de la licence est inclus dans la section intitulée GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue
de partager – de copier, distribuer et transmettre cette œuvre
d’adapter – de modifier cette œuvre
Sous les conditions suivantes :
paternité – Vous devez donner les informations appropriées concernant l'auteur, fournir un lien vers la licence et indiquer si des modifications ont été faites. Vous pouvez faire cela par tout moyen raisonnable, mais en aucune façon suggérant que l’auteur vous soutient ou approuve l’utilisation que vous en faites.
partage à l’identique – Si vous modifiez, transformez ou vous basez sur cet élément, vous devez distribuer votre contribution sous une license identique ou compatible à celle de l’original.
Ce bandeau de licence a été ajouté à ce fichier dans le cadre de la procédure de mise à jour des licences des images sous GFDL.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue
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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/Ne