# Star Catalogs

1. Sep 14, 2009

### Insanity

I am looking for star catalogs of stars within 200 lys of Earth for a project I am working on. I would like to have them as .csv, but any table format should do. I'll need such info as name, dist, mass, luminosity, spectral type, galactic coords or RA and Dec., radius. So far my attempts at google is a search overload and what I have found are not in table and cannot be copied easily.

Any help is appreciated.

2. Sep 15, 2009

### ideasrule

What you're asking for is pretty much impossible. See this list for the nearest 50:

http://en.wikipedia.org/wiki/List_of_nearest_stars

A lot of those stars are magnitude 17, and one of them is magnitude 22. To give you an idea of how many stars are that dim, take a look at this photo:

http://www.distantsuns.com/screen_shot6.html [Broken]

The faintest star there is only magnitude 16, two times brighter than magnitude 17 and 200 times brighter than magnitude 22. The entire chart covers a region roughly equal to the area covered by your thumb at arm's length. To find all stars within 200 light years, astronomers would have to look at every single one of those stars and determine whether its distance: an impossible task. Even photographing all those stars takes years of work, and to determine distance you'd need to take photos separated by six months to look for parallax. I don't know if any of the sky survey equipment can determine a star's position to within 20 milliarcseconds (the parallax at 200 ly), but I'll be really impressed if they can.

So, I don't think what you're asking for exists, or will exist any time soon.

Last edited by a moderator: May 4, 2017
3. Sep 15, 2009

### Chronos

4. Sep 15, 2009

Staff Emeritus
There are 39 stars within 15 light years of earth. That means one would expect 39 x (200/15)3 within 200 ly. That's about 100,000 stars - which is a lot. Worse, most of these stars are, as ideasrule mentions, practically invisible.

5. Sep 15, 2009

### Janus

Staff Emeritus
You can find some of the info here:

http://vizier.u-strasbg.fr/viz-bin/VizieR-3

You can add constraints to the search parameters and limit the results to just those parameters you need.

6. Sep 15, 2009

### mgb_phys

7. Sep 23, 2009

### Insanity

Thanks, over a billion objects might be overkill, but it surely helps.