8 August

Hipparcos, pinpointing the stars
27 FEB. 2004 publication date 924 Views

1989:On 8 August 1989, ESA launched its Hipparcos mission. Hipparcos pinpointed the positions of one hundred thousand stars. It turned slowly on its axis and repeatedly scanned right around the sky on different slants.

Hipparcos measured angles between widely separated stars, and recorded their brightness, which were often variable from one visit to the next. Each star selected for study was visited about 100 times over four years.


Related links

Artist's impression of exoplanet around a star
Johann von Lamont
C/1999 Comet Linear fragments
Mars Express

stay updated

Subscribe to our newsletter to receive the latest news, mission updates, and exclusive insights directly in your inbox. Be the first to know about our upcoming projects and breakthroughs.