Parallax data from Gaia

[Michael-H]

Ooo, shiny new data from Gaia: https://twitter.com/joaoalves/status/629856956530843648

It's not publicly available yet, but already 480k stars that were not measured in the Hipparcos catalogue, which only contained 118k stars. You can see that there is still some relatively large-error data from the spread in absolute magnitude.

I pulled these HR-diagrams out of the Hipparcos data for comparison. First, all stars showing a similar spread in absolute magnitude.

And second, a selection of low-error stars showing a more theoretically pleasing HR-diagram.

Which is how they originally presented the Hipparcos data too: https://www.rssd.esa.int/index.php?project=HIPPARCOS&page=HR_dia

I don't know that they didn't show filtered data at the IAU conference, there's only this tweet. Although, I am pumping them a little. Data release slated for next summer, once they have done and published all the obvious analyses.

Michael

[jabeoo1]

I have been wondering when we will see data from this amazing mission.  I can't wait to read the write ups and analysis.  Gaia is just fantastic. 

[Michael-H]

Here is the predicted coverage. I haven't found anything on the coverage of the actual HR-diagram.

http://www.aanda.org/articles/aa/abs/2014/06/aa23636-14/aa23636-14.html

Interestingly, don't see much of a white-dwarf signature. Even though Gaia is predicted to be the best white dwarf detector out there (http://arxiv.org/pdf/1506.02653v1.pdf). They may have been filtered out for this HR.

/M