天文应用
我正在尝试构建一个天文学应用程序,在该应用程序中,我应该显示给定纬度、经度和时间的天顶及其附近的星星。
我了解位置天文学的基础知识,令我困惑的是如何用大量数据创建数据库!
我的疑问是:
- 更喜欢哪个目录?喜欢依帕谷目录或亨利·德雷珀?它的优点和缺点是什么?
- 需要哪些字段?我已经确定了一些,但是还应该添加哪些内容,为什么?我识别的字段:恒星名称、一些独特的恒星 ID、RA、Dec、Magnitude、恒星颜色。
- 我试图找出从依帕谷目录中获取普通恒星名称的表,但没有任何运气:http://vizier.u-strasbg.fr/cgi-bin/VizieR-2?-source=I/239。我在任何表中都找不到。
谢谢, 拉吉
I am trying to build an astronomy application where I should display the stars at and near zenith for a given latitude, longitude and time.
I am aware of the basics of Positional astronomy, what is puzzling me is to create database out of huge set of data!
My Queries are:
- Which catalogue to prerfer? Like Hipparcos catalogue or Henry Draper? What are its advantages and disadvantages?
- What fields are required? I have identified some, but what else should be added and why? Fields identified by me: Star name, Some Unique star ID, RA, Dec, Magnitude,Color of the star.
- I tried to figure out from which table to fetch the Common Star name from the Hipparcos catalogue without any luck: http://vizier.u-strasbg.fr/cgi-bin/VizieR-2?-source=I/239. I couldnt find in any of the tables.
Thanks,
Raj
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我更喜欢 BSC 和 Hipparcos 目录
BSC 适用于裸眼应用(Bright Star Catalog 最高
6.5 mag
)。它是免费的,而且不会太大而无法处理(9110
星星)...Hipparcos 适用于 astro 应用程序(最高
12.5 星等
),并且大小也易于管理(118322
星)。它还包含视差,这意味着您可以获得3D位置数据,这对于立体3D成像非常有用。 ASCII 格式的原始文件大小为12.3 MB
。我将其编译为这些二进制形式:它足够小/快,足以存储在内存中和直接渲染。
使用哪些字段
解码/使用的绝对最小值为:RA、DE、Vmag、BV。为了获得更高的精度,还可以添加运动pmRA、pmDE。如果您想要3D,请添加视差Plx,但还要检查其误差是否不太高e_Plx。有时您还需要目录 HIP 中恒星的 ID,例如星座网格
恒星名称表
他们通常通过明星 ID 引用BSC,但此处 例如,包含更多与Hipparcos交叉引用的目录。
I prefer BSC and Hipparcos catalogs
BSC is for naked eye apps (Bright Star Catalog up to
6.5 mag
). It is free and not too big to handle (9110
stars)...Hipparcos is for astro apps (up to
12.5 mag
) and is also with manageable size (118322
stars). It also contains paralaxes which means you can obtain 3D position data which is cool for stereo 3D imaging. The original file size in ASCII format is12.3 MB
. I compile it to these binary forms:Which is small/fast enough for storing in memory and direct rendering.
what fields to use
Absolute minimum to decode/use are: RA,DE,Vmag,B-V. For more precision add also motions pmRA,pmDE. If you want 3D add paralax Plx but also check if its error is not too high e_Plx. Also sometimes you need the ID of star in catalog HIP for example for star constellations mesh
star names tables
They usually refers to BSC by ID of star but here for example are more catalogs cross-reference with Hipparcos included.