<p>If you are looking for professional data you can find them on <a href="https://vizier.u-strasbg.fr/viz-bin/VizieR-2" rel="nofollow noreferrer">VizieR</a>.
If you search for double star you will find 103 catalogues on double stars (some containing data only for a specific area in the sky).
I haven't looked at all 103 catalogues, but the <a href="https://cdsarc.unistra.fr/viz-bin/cat/J/PAZh/45/35" rel="nofollow noreferrer">Orbits of 451 wide visual double stars : J/PAZh/45/35</a> looks promising. (If you want to download it, go to the FTP tab.)</p>

CC BY-SA 4.0
2020-05-20T05:55:29.487Z
thank you very much very much. l have already tried VizieR, Simbad, USNO, and BDB. none of them provided masses of individual components i have to calculate it. in WDC, i could not download them.
Jiswin
CC BY-SA 4.0
2020-05-20T16:35:49.437Z
That might be more difficult. In the catalogue I mentioned there is a mass in the table but it seems to be the combined mass. i.e. the last two columns (see https://cdsarc.unistra.fr/ftp/J/PAZh/45/35/ReadMe).
Dieudonné
CC BY-SA 4.0
2020-05-26T05:21:47.220Z
thank you. at lat i got it... [http://vizier.u-strasbg.fr/viz-bin/VizieR-4]
Jiswin
CC BY-SA 4.0
2020-05-19T07:42:30.450Z
2020-05-19T07:42:30.450Z
Dieudonné
<p>I was doing a project on Binary stars. I wanted data of masses, eccentricity, semi-major axis, and radial velocity. I tried many sites but I couldn't find them. Where can I download such data from?</p>

CC BY-SA 4.0
2020-05-19T06:14:48.687Z
Try searching this site!
uhoh
CC BY-SA 4.0
2020-05-19T08:00:50.597Z
Many Google hits on "catalogue of binary stars"
ProfRob
<binary-star><contact-binaries>
Binary star data
Jiswin
# Binary star data

(Asked by: username_0 on 2020-05-19)

I was doing a project on Binary stars. I wanted data of masses, eccentricity, semi-major axis, and radial velocity. I tried many sites but I couldn't find them. Where can I download such data from?

**Tags:** binary-star, contact-binaries

> **Comments:**
> **username_1**: Try searching this site!  
> **username_2**: Many Google hits on "catalogue of binary stars"  

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## 1 answers

### Answer by username_3 on 2020-05-19. Score: 2

If you are looking for professional data you can find them on [VizieR](https://vizier.u-strasbg.fr/viz-bin/VizieR-2).
If you search for double star you will find 103 catalogues on double stars (some containing data only for a specific area in the sky).
I haven't looked at all 103 catalogues, but the [Orbits of 451 wide visual double stars : J/PAZh/45/35](https://cdsarc.unistra.fr/viz-bin/cat/J/PAZh/45/35) looks promising. (If you want to download it, go to the FTP tab.)

> **Comments:**
> **username_0**: thank you very much very much. l have already tried VizieR, Simbad, USNO, and BDB. none of them provided masses of individual components i have to calculate it. in WDC, i could not download them.  
> **username_3**: That might be more difficult. In the catalogue I mentioned there is a mass in the table but it seems to be the combined mass. i.e. the last two columns (see https://cdsarc.unistra.fr/ftp/J/PAZh/45/35/ReadMe).  
> **username_0**: thank you. at lat i got it... [http://vizier.u-strasbg.fr/viz-bin/VizieR-4]  

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