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[keyfc天文部]2014.01.04_Sextans星座流星雨观测指南

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象限仪座流星雨(Quadrantid)是出现在一月初的大流星雨
虽然这个流星雨辐射点位于牧夫座的区域内,但名称却来自一个已经废弃的星座——象限仪座,有一部分是现在的牧夫座。

六分仪座 A
Sextans A (also known as UGCA 205), is a tiny dwarf
irregular
galaxy. It spans about 5000 light-years across, and is located within the Local Group of galaxies, which includes our Milky Way galaxy. At 4.3 million light-years away from Earth, Sextans A is one of most distant members of the Local Group, and is notable for its peculiar square shape. Massive short-lived stars exploded in supernovae that caused more star formation, triggering yet more supernovae, ultimately resulting in an expanding shell. Young blue stars now highlight areas and shell edges high in current star formation, which from the perspective of observers on Earth appears roughly square.[5]


六分仪座 B或称UGC 5373,、DDO 70是一个位在六分仪座不规则星系,距离地球有四百万光年,是位在本星系团边缘星系之一。
Sextans B (also known as UGC 5373 and DDO 70) is an irregular galaxy that may be part of the Local Group, or lie just beyond it. Sextans B is 4.44 million light-years away from Earth and thus is one of most distant members of the Local Group, if it is indeed a member. It forms a pair with its neighbouring galaxy Sextans A.[4] It is a type Ir IV-V galaxy according to the galaxy morphological classification scheme.[5] Sextans B may also be gravitationally associated with the galaxies NGC 3109 and the Antlia Dwarf.[6]
Sextans B has a uniform stellar population,[7] but the interstellar medium in it may be inhomogeneous.[8] Its mass is estimated to be about 2 × 108 times the mass of the Sun, of which 5.5 × 107 is in the form of atomic hydrogen.[7] Star formation in the galaxy seems to have proceeded in distinct periods of low intensity, separated by shorter periods of no activity.[7] The existence of Cepheid variables in the galaxy implies that Sextans B contains at least some young stars.[5] The metallicity of Sextans B is rather low, with a value of approximately Z = 0.001.[7] Sextans B is receding from the Milky Way with a speed of approximately 300 kilometres per second (190 mi/s),[8] and probably lies just outside the edge of the Local Group, so as its neighbour Sextans A.[9]
Five planetary nebulae have been identified in Sextans B. It is one of the smallest galaxies in which planetary nebulae have been observed. These appear point-like and can be identified by their spectral emission lines.[10] It also contains a massive globular cluster.[11]

六分仪座由AB两颗星组成wwwww于是有了以下图示


正东方22:00左右升出地面,以东南方向约45度向上升起,每小时仰角增大10°左右。 大体只需对大地东面星空发呆即可……


最后编辑思兼SRW 最后编辑于 2014-01-03 20:02:04
4

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    本主题由 版主 思兼SRW 于 2014/1/4 17:58:27 执行 移动主题 操作
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    45°角仰望星空么XD……据说帝都这边在高峰时辐射点还没升起来呢,而且象限座流星雨的高峰期又很短……最重要的是明天要考试啊啊……
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    中午ccav新闻台也播出了,貌似是个观星的好机会,今夜值得一看。
    小可”一般都用于男性对自己的谦称。(“小”字一族。谦称自己或与自己有关的人或事物。)现充中。
    奸笑社请你吃土
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    a.....发现得太晚了..................
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    看流星了看流星了!

    站在最低点,仰望最高处
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    冬季观星两个大敌,一个是气温,还有就是考试= =。
    各位小心别感冒了哦
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    .... 我突然发现一个很奇怪的情况........
    为什么上上上楼也就是我的上一贴( ̄▽ ̄")  显示的发帖时间是
    2013-01-04 10:35

    ???
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    这件事被忘记了
    该死的加班。
    現実へと繋がっていたくないんだが、不可能とすでに知ってた、どうしたらいいのか答えも出てくれない、それでも生活は続いていく。人はお腹が空いたら食い物を探しに行くので、実にその答えはあるのかどうか重要にならないんだ。
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    没有雾霾的地方 今年也是这个教程

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