天文每日一图-4.6&4.7

天蝎座疏散星团M7
M7是天空中最著名的疏散星团（open clusters）之一。这个星团以明亮的蓝星为主，位于天蝎座（Scorpius），你可以凭肉眼在蝎子的尾巴处找到它。M7包含大约100颗恒星，年龄约2亿岁，横跨25光年（light-years），离我们大约1000光年远。这张彩色图像是美国亚利桑那州基特峰国家天文台（Kitt Peak National Observatory）于最近拍摄的，它是高级观测计划（Advanced Observers Program）的一部分。M7星团在古代就已很出名，托勒密（Ptolemy）在公元130就曾提到过它。我们还可以看到，靠近图像底部的有黑暗的尘埃云（dark dust cloud），以及银河系中心方向的数以百万计的毫不相关的恒星。（小海译，小兔校）

The M7 Open Star Cluster in Scorpius
Credit & Copyright: Allan Cook & Adam Block, NOAO, AURA, NSF
Explanation: M7 is one of the most prominent open clusters of stars on the sky. The cluster, dominated by bright blue stars, can be seen with the naked eye in a dark sky in the tail of the constellation of Scorpius. M7 contains about 100 stars in total, is about 200 million years old, spans 25 light-years across, and lies about 1000 light-years away. This color picture was taken recently at the Kitt Peak National Observatory in Arizona, USA as part of the Advanced Observers Program. The M7 star cluster has been known since ancient times, being noted by Ptolemy in the year 130 AD. Also visible is a dark dust cloud near the bottom of the frame, and literally millions of unrelated stars towards the Galactic center.

今天的图又很大,点这里看大图http://antwrp.gsfc.nasa.gov/apod/image/0504/m7_cook_big.jpg

做链接真麻烦啊

这些链接本来是原文里的，但我觉得放在这里更合适
关于本图(设备参数等)http://www.noao.edu/outreach/aop/observers/m7.html

更多M7的资料http://www.seds.org/messier/m/m007.html

The Annotated Galactic Center(带注释的银河中心图像)
http://antwrp.gsfc.nasa.gov/apod/ap011229.html

亚利桑那州简介http://az.gov/webapp/portal/

CIA网站上的美国概况http://www.cia.gov/cia/publications/factbook/geos/us.html

什么是星座？http://www.astro.wisc.edu/~dolan ... constellations.html

M7的位置，赤道坐标，横线为银河

日食一景
本周五的日食将会是少见的混合——沿着月影（Moon's shadow）轨迹的窄带会出现短暂的日环食或日全食。不幸的是这条日食带只有三十公里宽，从新西兰南部开始刚好截止于委内瑞拉，大部分落在太平洋里。位于月影轨迹起点和终点附近的观测者将看到日环食——即在很短的时间里，月亮的轮廓被一个明亮的光环（Ring of Fire）所包围；位于日食带中部的观测者才可以看到全食（total eclipse）。但也有一个好消息，在地球上很广阔的区域内，包括新西兰和美洲的大部，可以看到日偏食（partial eclipse）——就像月亮把太阳咬掉了一部分。如果你打算观看日食，请务必注意安全（Observing Eclipses Safely），并核对好你所在地点发生日食的时间。那么，这张日食照片是在哪里拍的呢？毫无疑问，它拍摄于2003年11月月影穿越南极洲时。(小海译，小兔校)
Solar Eclipse in View
Credit & Copyright: Fred Bruenjes (moonglow.net)
Explanation: Friday's solar eclipse will be a rare hybrid - briefly appearing as either an annular eclipse or a total eclipse when viewed from along the narrow track of the Moon's shadow. Unfortunately that track, never more than about 30 kilometers wide, lies mostly across the Pacific Ocean, beginning south of New Zealand and just ending in Venezuela. Skywatchers along the beginning and end of the shadow track will see an annular eclipse of the Sun, with the Moon's silhouette briefly surrounded by a bright ring of fire, while observers along the middle of the track will witness a total eclipse phase. But the good news is that over a much broader region of the globe, including New Zealand and much of South and North America, a partial eclipse can be seen as the Moon appears to take a bite out of the Sun. If you want to view the eclipse, take care to do it safely, and check the times for your specific location. So, what location is this solar eclipse view from? The picture above was recorded in November of 2003 from within the track of the Moon's shadow across Antarctica, of course.

关于周五日食的更多信息http://sunearth.gsfc.nasa.gov/eclipse/SEmono/HSE2005/HSE2005.html
详细参数及月影区图示http://sunearth.gsfc.nasa.gov/ec ... ig/HSE2005map1b.GIF

各地日食时间http://sunearth.gsfc.nasa.gov/ec ... 5-2.html#2005Apr08H
http://sunearth.gsfc.nasa.gov/eclipse/SEmono/HSE2005/PSE2005.html

关于本图更多信息http://antwrp.gsfc.nasa.gov/apod/ap031208.html

第一个在北京天文馆看过的
第三个蛮有意思的~~呵呵

强！严重支持！顶！
楼主辛苦了！！！！！！！！

漂亮!!!!!!!