description Hipparcos Overview
Hipparcos was a European Space Agency observatory launched in 1989. It performed groundbreaking measurements of stellar positions and distances using parallax – tiny shifts in apparent position caused by Earth’s orbit. This data significantly improved our understanding of the Milky Way galaxy's structure and star populations, primarily benefiting astronomers studying galactic dynamics and stellar evolution. The satellite was decommissioned in 2003.
help Hipparcos FAQ
What was the main scientific purpose of the Hipparcos mission?
Hipparcos was an European Space Agency (ESA) satellite launched in 1989 designed to measure the precise positions, distances, and motions of stars. It used the parallax method—tracking tiny shifts in apparent positions caused by Earth’s orbit—to fundamentally improve our understanding of the Milky Way's structure.
How many stars did the Hipparcos telescope catalog?
The Hipparcos mission cataloged highly precise measurements for over 100,000 stars during its operational lifespan. Additionally, its Tycho experiment measured more than a million additional stars with slightly lower accuracy.
When did the Hipparcos satellite operate?
The Hipparcos satellite was launched by an Ariane 4 rocket in 1989 and operated until 1993. Its final star catalogs were officially published in 1997 and are still widely used by astronomers today.
What is the successor to the Hipparcos space observatory?
The direct successor to Hipparcos is the ESA's Gaia mission, which launched in 2013. Gaia builds upon Hipparcos's legacy by charting the positions of over a billion stars, creating the most precise 3D map of our galaxy ever attempted.
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