Gaia making a 3D-map of a Billion stars, new space observatory |
Gaia making a 3D-map of a Billion stars, new space observatory |
Apr 1 2006, 07:38 PM
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Member Group: Members Posts: 124 Joined: 23-March 06 Member No.: 723 |
Have you guys heard about this one ?
Gaia observatory link link QUOTE "The satellite will determine the position, colour and true motion of one thousand million stars and over 100,000 objects in our Solar System. Gaia will also identify as many as 10,000 planets around other stars. " QUOTE "Gaia will measure distance (from parallax) out to ~100,000 parsecs; for stars ~10,000 pc away, with a Vmag of ~<15, Gaia will measure their distances accurate to ~10-20%." You can also read about it here http://www.spaceflightnow.com/news/n0407/06mapping/ http://en.wikipedia.org/wiki/Gaia_probe or check the European space site |
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Dec 19 2013, 01:36 PM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Without reading the documents, just as a hint how to look at the claims:
They won't be talking of resolution in the usual optical sense, meaning distinguishing two objects, but of the determination of the position of a star. If you take a Gauss bell curve, you can determine the maximum/average with a much higher precision than separating two superposed bell curves, where you need about one sigma. The other trick is using two telescopes to increase the effective aperture along one line; they originally intended to use interferometry, but seem to have found an even better solution. Edit: You'll find much more detail in the DPAC Newsletters. To add some more basis (Newsletter 17): QUOTE Since Friedrich Bessel announced in 1844 that Sirius and Procyon had an unseen companion, it is well known that they can be detected through the wobble in the star proper motion. In fact, when the luminosities of the components are not very different, we do not observe the motion of the brightest star around the barycentre, but the motion of the photocentre, which is the luminosity centroid. AGIS on the Powerpoint level. Some math. AGIS in a nutshell. Details behind the paywall. |
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