Questions tagged [gaia]

Gaia is a space observatory of the European Space Agency (ESA) designed for astrometry. The mission aims to construct a 3D space catalog of approximately 1 billion astronomical objects.

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What causes GAIA rotational axis to precess the way it does? How exactly is this accomplished?

The GAIA spacecraft rotates at 1 degree per minute about its axis, scanning two telescopes looking 106.5 degrees apart but imaging on the same focal plane around a circle every 6 hours. The rotation ...
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How is GAIA's phased array configured, mechanically and electrically?

GAIA is an amazing pair of space telescopes that share a single Gigapixel CCD array, with a complex optical system capable of repeated, extremely precise position, brightness, parallax, proper motion, ...
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Why does the Gaia space telescope have two main mirrors

The Gaia space telescope has two main mirrors that look in different directions, 106⁰ apart. The light of both is focused on a single CCD. Why does it have two main mirrors? Is it only to have more ...
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Why is Gaia so much dimmer than we thought?

The ESA is using ground-based telescopes to precisely gauge the position of the Gaia satellite. But the satellite appears at about the 21st magnitude, three magnitudes dimmer (~16 times) than expected!...
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What are reasons to put Gaia space telescope into L2 Lagrangian point of Sun-Earth system?

As I remember, Gaia (wiki, ESA) was planned to flight away from Earth, so it orbit is not LEO, and not GEO. It is located near 1.5 millions kilometers away from Earth, orbiting thousands kilometers ...
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What is the flight plan to get Gaia in orbit around the Sun–Earth $L_2$ Lagrangian point?

Gaia is a planned European Space Agency's (ESA) space observatory that will aim to chart a three-dimensional map of our Galaxy, the Milky Way. It is planned to operate around the Sun–Earth $L_2$ (SEL2)...
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