<p>You could try the <a href="http://leda.univ-lyon1.fr" rel="nofollow noreferrer">Hyperleda</a> database. You will have to learn to use the database, which possibly means learning a little bit of SQL. For starters you could select all items with redshift $cz &lt; H_0\times 150$ km/s, using redshift as a distance indicator. This should be roughly ok at 150 Mpc (though I don't see any viable alternative).</p>

<p>The returned catalogue should have (at least) RA, Dec, redshift, possibly a size and morphology and, for a small subset of the galaxies, a redshift-independent distance estimate. Given that very nearby galaxies (in the local group or a $d &lt; 50 $Mpc) are not fully part of the "Hubble flow" you might choose to use these in preference to a redshift-distance where available.</p>

<p>X,Y,Z coordinates (based in the equatorial system) can be calculated using <a href="http://www.astronexus.com/a-a/positions" rel="nofollow noreferrer">this prescription</a> or in Galactic coordinates (with respect to the centre and orientation of our Galaxy can then be found using the operations defined in <a href="http://adsabs.harvard.edu/full/1987AJ.....93..864J" rel="nofollow noreferrer">Johnson &amp; Soderblom (1987)</a>.</p>

<p>I have no idea how complete this database will be. Certainly there will be an issue with extinction near the Galactic plane.</p>

CC BY-SA 3.0
2017-03-28T16:48:02.953Z
For nearby galaxies, do you mean that redshift-independent distance is preferable to redshift?
Mike G
CC BY-SA 3.0
2017-03-28T17:36:41.010Z
@MikeG Yes I do. Edited.
ProfRob
CC BY-SA 3.0
2016-12-28T08:35:52.530Z
2017-03-28T17:36:03.063Z
2017-03-28T17:36:03.063Z
ProfRob
<p>For a data visualization project, I want to extract galaxy data (in x y z coordinates) from galaxy catalogue of within 150 mpc and project each of those galaxies as dots and visualize them in a 2D projection of a spherical volume. Need your help in getting this data set and how to achieve it?</p>

<p>Would be grateful for any help in any way!</p>

CC BY-SA 3.0
2016-12-27T14:37:39.510Z
The NED database https://ned.ipac.caltech.edu
ProfRob
CC BY-SA 3.0
2016-12-27T17:01:55.147Z
Every catalog of galaxies is going to be missing all those galaxies that lie behind the milkyway. There will be a big slice missing, whatever data you use.
James K
CC BY-SA 3.0
2016-12-27T17:48:46.387Z
@barrycarter As I'm sure I've mentioned before (?), Nomad is mostly a stellar catalogue.
ProfRob
CC BY-SA 3.0
2016-12-28T06:00:30.377Z
thanks for your answers. sorry to sound so dumb but on Nomad website, where do i go from there? What dataset do i download and what software do i use to project in xyz coordinates? I am trying to get something like this pic-- https://ned.ipac.caltech.edu/level5/March12/Coil/Coil1.html
Manny S
<galaxy><coordinate><space-geometry>
How to project galaxy data in x y z coordinates?
Manny S
# How to project galaxy data in x y z coordinates?

(Asked by: username_0 on 2016-12-27)

For a data visualization project, I want to extract galaxy data (in x y z coordinates) from galaxy catalogue of within 150 mpc and project each of those galaxies as dots and visualize them in a 2D projection of a spherical volume. Need your help in getting this data set and how to achieve it?

Would be grateful for any help in any way!

**Tags:** galaxy, coordinate, space-geometry

> **Comments:**
> **username_1**: The NED database https://ned.ipac.caltech.edu  
> **username_2**: Every catalog of galaxies is going to be missing all those galaxies that lie behind the milkyway. There will be a big slice missing, whatever data you use.  
> **username_1**: @barrycarter As I'm sure I've mentioned before (?), Nomad is mostly a stellar catalogue.  
> **username_0**: thanks for your answers. sorry to sound so dumb but on Nomad website, where do i go from there? What dataset do i download and what software do i use to project in xyz coordinates? I am trying to get something like this pic-- https://ned.ipac.caltech.edu/level5/March12/Coil/Coil1.html  

---

## 1 answers

### Answer by username_1 on 2016-12-28. Score: 3

You could try the [Hyperleda](http://leda.univ-lyon1.fr) database. You will have to learn to use the database, which possibly means learning a little bit of SQL. For starters you could select all items with redshift $cz < H\_0\times 150$ km/s, using redshift as a distance indicator. This should be roughly ok at 150 Mpc (though I don't see any viable alternative).

The returned catalogue should have (at least) RA, Dec, redshift, possibly a size and morphology and, for a small subset of the galaxies, a redshift-independent distance estimate. Given that very nearby galaxies (in the local group or a $d < 50 $Mpc) are not fully part of the "Hubble flow" you might choose to use these in preference to a redshift-distance where available.

X,Y,Z coordinates (based in the equatorial system) can be calculated using [this prescription](http://www.astronexus.com/a-a/positions) or in Galactic coordinates (with respect to the centre and orientation of our Galaxy can then be found using the operations defined in [Johnson & Soderblom (1987)](http://adsabs.harvard.edu/full/1987AJ.....93..864J).

I have no idea how complete this database will be. Certainly there will be an issue with extinction near the Galactic plane.

> **Comments:**
> **username_3**: For nearby galaxies, do you mean that redshift-independent distance is preferable to redshift?  
> **username_1**: @MikeG Yes I do. Edited.  

---

