中文名称：RealSky 数字巡天 北天球部分 9CD 100倍压缩比率版
英文名称：RealSky CD-ROM North
别名：RealSky Digitized Sky Survey Northern Hemisphere
语言：英语
简介：
我的说明：
这套资料是我用了两个月从eMule上拖下来的，可说是比较难得的。国内好多天文同好想要却无处可巡，主要是因为源大都是在国外，面对5GB的巨大文件和5KB/s的速度，大多数人都退却了。
不管怎么说，现在我下完了，配合SkyMap Pro 10使用，我觉得非常好，所以准备长期共享给需要的天文同好。不过由于我的带宽实在有限（电信上传限制512kbps，我还准备发动同学和我一起共享），今天我在这里发布，算是我起个头，下载了的同好别急着删除，至少共享一到两张CD，希望国内的天文爱好者都能用到这套东西。
我最新的说明（来自论坛里我的回帖，方便不能登陆论坛的朋友们）：
XP下能使用，用第一张CD里的RealSkyView就能看图，不过那样只是按号索图，如果能用SkyMap Pro，或者The Sky配合这套数据光盘使用，在电子星图上加叠RealSky背景图是最好了。
SkyMap Pro已经是第10版（skymap.com），各方面都很完善了，之前有人已经在这里发过，我就不发了。The Sky 5我也有，看情况吧。
东西是比较专业，不可能像Starry Night Pro那样花哨。但本着“国外爱好者能用上的资料，我们也要有”的精神，我会尽量为大家做贡献。希望国内的业余天文事业能蓬勃发展，赶上国际先进水平。
谢谢大家支持！
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如果大家没有SkyMap Pro、The Sky等电子星图软件，那就需要是直接在RealSkyView里看图（不过，我强烈建议大家去下SkyMap Pro，xbox同好已经发布，地址为http://bbs.VeryCD.com/topics/153449.asp，下载SkyMap Pro 10 CD1安装即可）。
CD0是RealSkyView安装程序，CD1到CD8都是数据盘，大家可以先下CD0，确保有了数据盘后可以直接使用。
在RealSkyView里我推荐大家用目标列表（Target List）寻找需要的天体。
具体方法是：在DSS菜单里按Target List，按Open List，利用RealSkyView自带的一些目标列表找天体。其中demo是一些著名天体的列表，Disk1，2，3……是按资料盘分的天体列表，NGC是所有的NGC编号的天体列表，NGC1000指NGC编号小于等于1000的NGC天体列表，NGC1500指NGC编号在1001到1500之间的NGC天体列表等等等等。
当然全天的天体中NGC天体只是一小部分，在DSS菜单里的View New Target窗口中可以自己输入赤经（Right Ascension）赤纬（Declination），天区面积（Size，角分作单位）和历元（Epoch），输入后按查看（View）就能生成所要的图像，不过前提是你的光驱或虚拟光驱里放着正确的资料盘。
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关于Disk0错误的说明：
由于我的疏忽，原来发布的Disk0的文件名有错误。新下载的网友请用最下面的那个Disk0链接，已下载的网友请把文件名改为
[RealSky.数字巡天.北天球部分.9CD.100倍压缩比率版].Astronomy_RealSky_Digitized_Sky_Survey_Northern_Hemisphere_dss_Disk_0_Setup_Sergaent.nrg
给大家带来麻烦，敬请见谅！
RealSky的来由：
National Geographic Society-Palomar Observatory Sky Survey(Poss)是第一个近代建构天空摄影星图的计划，以Palomar山的48吋Oschin Schmidt望远镜进行。于1958年完成，九年的努力制作数千个14吋平方的玻璃干板，每个包含6.4度平方的区域，重叠的区域大于0.4度平方。
在红蓝两个波长范围摄影，20等暗的星云和星星都被记录下来。复制的组合录印在纸上（较少在干板上）变成各地天文学家研究的基本工具，提供大量的信息给广泛的研究领域如星系记数、超新星和变星研究、确认X-射线和无线电波源的光学复本，多天体光谱及索引星图的准备等。
数字化巡天
STScI将摄影巡天计划以八年时间数字化，提供支持哈勃太空望远镜运作的影像和星表数据。（在此计划里北半球的数字巡天The Circa 1983 epoch Palomar Quick由NASA总部经费支持，STScI工程师于1992年6月开始，成为GS的基础） 。
压缩数字影像
STScI工程师和天文学家修改一对微密度仪microdensitometers，以产制高准确度的扫描，总共花五年扫描并转换成数据库。数字化的扫描描述大量数据。每一干版扫描量测14,000*14,000 15-bit像素。为了使研究者更能接取数字巡天计划，天文研究学家确认和广泛测试以10:1比率压缩数据的算法而不大量降低星球资料和亮度的准确度。压缩技术是以H-转换（适应性波包转换Adaptive wavelet transform）为基础，以使压缩极大化而数据损失极小化。于1994年，10倍数数字巡天(10x Digitized Sky Survey DSS)以102片光盘上市，提供全天深空影像。此中要的工具提供作广泛研究的工具，并能以现代研究用软件快速操作的格式迅速提供天文学家处理影像。
RealSky CD
此八片RealSky CD包含1949-58元期Palomar Sky Survey E band (红板)以100倍压缩比率制成。是大众第一次能够接触到天文学家使用的真实巡天干版，尤其像星系、星云、星团的广延影像，史无前例，是其它天文软件所没有的。未压缩的巨额数据库以目前的储存技术需要超过八百片的光盘存放。100倍压缩数据使此基本资源可取得，基本上属于忠实的重制。但对严肃的使用者，必须提出以下警告：1.在极对比增强(extreme contrast enhancement)，天空背景以补绽或倾斜的出现代替，这是由于需要以此高度压缩离散化天空噪声。2.光电测光时，通量极限flux limit大约比原始干板极限亮一星等，而光电测光准确度可能比较亮天体退化至多15%。
英文信息：
RealSky: Providing Access for Everyone
--------------------------------------
In cooperation with both the Space Telescope Science Institute
and the Astronomical Society of the Pacific,a compressed version
of the Digitized Sky Survey data, appropriately named RealSky.
This set of nine CD-ROM's (eight for data and one for software)
contains the E band (red) plates from the Palomar Observatory Sky Survey,
compressed by a factor of 100, and it also contains RealSkyView
a software package that you can use to display and process the images.
For the first time, everyone has access to the actual deep-sky
survey plates used by research astronomers!
RealSkyView Software
---------------------
RealSkyView gives you the power to view and manipulate the RealSky
images on both Windows and Macintosh platforms.
With RealSkyView, you can display the RealSky images on your computer screen,
smooth or sharpen the images, rotate the images, alter the brightness and contrast
of the images, quickly set up browse lists for examining the images, and more.
当年的发行信息如下：
FOR RELEASE: April 30, 1996
CONTACT: Ray Villard
Space Telescope Science Institute, Baltimore, MD
(Phone: 410-338-4514)
Wendy Eck
Astronomical Society of the Pacific, San Francisco, CA
(Phone: 415-337-1100)
PRESS RELEASE NO.: STScI-PR96-20
THE ORIGINAL NATIONAL GEOGRAPHIC SOCIETY- PALOMAR OBSERVATORY SKY SURVEY TO BE AVAILABLE ON 8 CD-ROMS
The Space Telescope Science Institute (STScI) and the Astronomical Society of the Pacific (ASP) are pleased to announce the availability of RealSky CD, the digitized Palomar Observatory Sky Survey compressed by a factor of 100x, available on 8 CD-ROMs.
For the first time, amateur astronomers, educators, and the public will have access to the actual sky survey plates used for more than thirty years by research astronomers. The unprecedented level of telescopic detail, especially of extended images like galaxies, clusters, and nebulae, is not available in any other astronomical software package.
The images are digitizations of the E plates from the first NGS-POSS, conducted with the Oschin Telescope (48" Schmidt) on Palomar Mountain during the 1950s. The NGS-POSS was funded by a grant from the National Geographic Society to the California Institute of Technology.
With funding from NASA, the more than 750 plate images were first digitized during an intensive eight-year effort by STScI astronomers to prepare the Guide Star Catalog which provides the coordinates of target stars that are used by the Hubble Space Telescope for acquiring and locking onto celestial targets.
RealSky CD is a more compressed version of the original Digitized Sky Survey (DSS) which was made available on 102 CD-ROMs two years ago. The DSS was compressed by a factor of 10 and offered images that were nearly indistinguishable from the original data. The 100x compression factor of RealSky is not suitable for professional research activity but provides an invaluable tool for the educational and amateur communities.
RealSky CD offers single-color (one passband) images of the entire northern sky, down to -15! declination--the approximate location of Sirius--and angular resolution of 1.7 seconds, revealing stars as faint as 19th magnitude.
The included RealSkyView software allows users to view and manipulate the images under Windows (3.1, '95, NT) or Macintosh operating systems. UNIX and VMS software is also included with both versions. Both RealSky CD and the original 10x Digitized Sky Survey can be accessed directly from TheSky (v.4) astronomy software by simply clicking on the desired sky area and specifying the image size. CDS are packaged with instruction manual and accompanying software.
RealSky CD will be available July 1, 1996. The cost of the 8 CD-ROM set will be $225.00 if ordered prior to the release date. After July 1, the price will be $250.00. Within the U.S., add $16 for shipping and handling charges; Canada and Mexico residents please add $20; all other countries add $50 for delivery by airmail. California residents please add applicable sales tax. Use your Visa or Mastercard to order at 1-800-335-2624 or send orders by check, credit card, or institutional purchase orders to:
The Astronomical Society of the Pacific RealSky CD Orders 390 Ashton Avenue San Francisco, USA tel: 415/337-1100 fax: 415/337-5205 e-mail: asp@stars.sfsu.edu
* * * *
The Space Telescope Science Institute is operated by the Association of Universities for Research in Astronomy, Inc. (AURA), for NASA, under contract with the Goddard Space Flight Center, Greenbelt, MD. The Hubble Space Telescope is a project of international cooperation between NASA and the European Space Agency (ESA).
Space Telescope Science Institute press release text and other information are available automatically by sending e-mail to listserv@stsci.edu. In the body of the message (not the subject line) type the words "subscribe pio Your Name." Don't use quotes or user/account names; i.e., someone named Jane Doe would type subscribe pio Jane Doe. The system will reply with a confirmation of your subscription via e-mail, and new press releases will be received by e-mail.
一些帖图：
