Ringkasan

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

Diizinkan untuk menyalin, mendistribusikan dan/atau memodifikasi dokumen ini di bawah syarat-syarat Lisensi Dokumentasi Bebas GNU, Versi 1.2 atau lebih baru yang diterbitkan oleh Free Software Foundation; tanpa Bagian Invarian, tanpa Teks Sampul Depan, dan tanpa Teks Sampul Belakang. Salinan lisensi dimasukkan ke bagian yang berjudul Lisensi Dokumentasi Bebas GNU.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

	Berkas ini dilisensikan dengan lisensi Creative Commons Atribusi-BerbagiSerupa 3.0 Tanpa Adaptasi
	Anda diizinkan: untuk berbagi – untuk menyalin, mendistribusikan dan memindahkan karya ini untuk menggubah – untuk mengadaptasi karya ini Berdasarkan ketentuan berikut: atribusi – Anda harus mencantumkan atribusi yang sesuai, memberikan pranala ke lisensi, dan memberi tahu bila ada perubahan. Anda dapat melakukannya melalui cara yang Anda inginkan, namun tidak menyatakan bahwa pemberi lisensi mendukung Anda atau penggunaan Anda. berbagi serupa – Apabila Anda menggubah, mengubah, atau membuat turunan dari materi ini, Anda harus menyebarluaskan kontribusi Anda di bawah lisensi yang sama seperti lisensi pada materi asli.
	Label lisensi ini ditambahkan pada berkas sebagai bagian dari pemutakhiran lisensi 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

Lisensi

Diizinkan untuk menyalin, mendistribusikan dan/atau memodifikasi dokumen ini di bawah syarat-syarat Lisensi Dokumentasi Bebas GNU, Versi 1.2 atau lebih baru yang diterbitkan oleh Free Software Foundation; tanpa Bagian Invarian, tanpa Teks Sampul Depan, dan tanpa Teks Sampul Belakang. Salinan lisensi dimasukkan ke bagian yang berjudul Lisensi Dokumentasi Bebas GNU.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

	Berkas ini dilisensikan dengan lisensi Creative Commons Atribusi-BerbagiSerupa 3.0 Tanpa Adaptasi
	Anda diizinkan: untuk berbagi – untuk menyalin, mendistribusikan dan memindahkan karya ini untuk menggubah – untuk mengadaptasi karya ini Berdasarkan ketentuan berikut: atribusi – Anda harus mencantumkan atribusi yang sesuai, memberikan pranala ke lisensi, dan memberi tahu bila ada perubahan. Anda dapat melakukannya melalui cara yang Anda inginkan, namun tidak menyatakan bahwa pemberi lisensi mendukung Anda atau penggunaan Anda. berbagi serupa – Apabila Anda menggubah, mengubah, atau membuat turunan dari materi ini, Anda harus menyebarluaskan kontribusi Anda di bawah lisensi yang sama seperti lisensi pada materi asli.
	Label lisensi ini ditambahkan pada berkas sebagai bagian dari pemutakhiran lisensi GFDL.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue