<p>How can someone obtain such vector, for stars in the Milky Way?</p>

<p>Input should be star data (from a catalog, eg: Hipparcos) and Julian Date.</p>

<p>Output should be a Vector Position (in pc) in relation to the galactic center.</p>

CC BY-SA 3.0
2016-01-14T00:02:33.917Z
A vector position requires a reference axis set as well as a central point.  What do you propose to use as to define the reference with.
StephenG - Help Ukraine
CC BY-SA 3.0
2016-01-14T00:38:26.633Z
As stated, the axis center should be set on the Galactic Center (center of the Milky Way). Galactic Coordinates alone aren't enough to answer this question. I need to know how to transform the input data (star data and date) into the required position vector.
hawaii
CC BY-SA 3.0
2016-01-14T09:19:47.707Z
I'm not sure if this is helpful or not, but [this paper (pdf)](http://www.rssd.esa.int/SA-general/Projects/Hipparcos/CATALOGUE_VOL1/sect1_05.pdf) details how to transform between different coordinate systems.
StephenG - Help Ukraine
CC BY-SA 3.0
2016-01-14T13:36:27.113Z
It could be possible, but from the data available on sites like [Sinbad](http://simbad.u-strasbg.fr/simbad/) it appears that distant stars have more data to the used on the calculation, than a simple horizontal coordinate system (where you would include the required date) to galactic coordinate system transformation.
hawaii
<star><galaxy><coordinate><positional-astronomy>
Obtaining stars vector position in relation to the center of the galaxy at a given date
hawaii
# Obtaining stars vector position in relation to the center of the galaxy at a given date

(Asked by: username_0 on 2016-01-13)

How can someone obtain such vector, for stars in the Milky Way?

Input should be star data (from a catalog, eg: Hipparcos) and Julian Date.

Output should be a Vector Position (in pc) in relation to the galactic center.

**Tags:** star, galaxy, coordinate, positional-astronomy

> **Comments:**
> **username_1**: A vector position requires a reference axis set as well as a central point.  What do you propose to use as to define the reference with.  
> **username_0**: As stated, the axis center should be set on the Galactic Center (center of the Milky Way). Galactic Coordinates alone aren't enough to answer this question. I need to know how to transform the input data (star data and date) into the required position vector.  
> **username_1**: I'm not sure if this is helpful or not, but [this paper (pdf)](http://www.rssd.esa.int/SA-general/Projects/Hipparcos/CATALOGUE_VOL1/sect1_05.pdf) details how to transform between different coordinate systems.  
> **username_0**: It could be possible, but from the data available on sites like [Sinbad](http://simbad.u-strasbg.fr/simbad/) it appears that distant stars have more data to the used on the calculation, than a simple horizontal coordinate system (where you would include the required date) to galactic coordinate system transformation.  

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## 0 answers

