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Astronomy Science data


  1. Overview

Gaia Observatory:

Information about Gaia:

The Gaia observatory is a further development from the earlier Hipparcos mission (1989 - 1993). One of the people behind Gaia is the Swedish astronomer, Lennart Lindegren at Lund University. Gaia will get astrometry data for more than one billion stars compare with Hipparcos 1 million stars. The precision of the positions is in milli arcseconds. It's so precise that it can be used to detect exoplanets, they are talking about 70'000 exoplanets !

Video about Gaia:

Video about how Gaia do the astrometry:

Info about the L2 Lagrangian point where Gaia is placed:

Gaia Observatory data archives:

The data is not in the form of pretty photos, it's table of data with astrometry, position, velocities, spectra etc over one billion stars.


You found the data here:

Ideas what I can do with this Gaia data:

Here is one example of what can be done with this data:

But there are so much more you can use these data for: orbits of comets, exoplanets, galaxies, quasars ...

Have a look on this video:

I have just started this project, it will take long time before I could do something advanced. I only collecting information now.

Work I have done on Gaia archive data:

My idea is to make this like a tutorial, you can follow me when I learning this and learn from my mistakes.

I use some basic to start with. I want to list all objects with a parallax bigger then 1 arcsec (if I chose a smaller number there will be too many objects). That are objects at a maximum distance of 1 parsec (3.26 light years) from our Sun's barycenter. The closets star I know about is 4 ly away so there should not be any.

Now with that experience I add more filters to get all objects from 0.1 parallax and brighter than magnitude 10 and radial speed above 1 km/sec year. I want the objects to be stars.

Now it's time to draw the first graph from the data. I want to make a Hertzsprung-Russell diagram from star data, I also want the objects to be stars. They are all close to the Sun, radius 32 and 64 Parsec.

Next attempt how to use the data is to make a histogram over the velocities. I use the same data as above.

Map the directions of the positions of nearby stars.

Some useful general information:

Variable amateur astronomers normally use the JD (Julian date) as timestamp of the data, professional astronomer use the MJD (Modified Julian Date). If you want to compare the data it's wise to use the same standard.

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