Mu Arae c, also known as HD 160691 c, is a planet orbiting a sun-like star in the constellation Ara, roughly fifty light-years away. It was announced in 2004 by a team led by Nuno Santos using the HARPS spectrograph at the European Southern Observatory in Chile. With a mass of about fourteen times that of the Earth and an orbit of around ten days, it was one of the first known planets of the intermediate size between rocky worlds and giants, similar to Neptune. Its discovery showed that such planets existed close to their stars. The system has since been found to have at least four planets.
Before and after
- 29 July 2004Founding of Meta Platforms
- 3 August 2004Launch of MESSENGER
- 5 August 2004Construction of Guangzhou Baiyun International Airport
- 9 August 2004Release of OpenStreetMap
- 25 August 2004Discovery of Mu Arae c
- 31 August 2004Beersheba bus bombings
- from 31 August 2004 to 27 May 2005Premiere of Father of the Pride
- September 2004Beslan school siege
- 7 September 2004Founding of Wikimedia Commons
More in Universe & space
- 16 February 1948Discovery of Miranda
- 5 September 1977Launch of Voyager 1
- 4 March 1979Discovery of Metis
- 24 April 1990Launch of Hubble Space Telescope
- 10 April 2019The first image of a black hole
- 25 December 2021Launch of James Webb Space Telescope
The era
This moment belongs to the Contemporary world (1945 CE to today), the world since 1945. You can also browse everything in the 21st century.