1RXS1609 (also known as 1RXS J160929.1−210524) is a pre-main-sequence star about 470 light years away from Earth in the constellation of Scorpius.

the star was identified as a member of the Upper Scorpius subgroup of the Scorpius-Centaurus Association by Thomas Prebisch and coauthors in 1998, and originally was assigned an age of about 5 million years old based on its group membership, though more recent analysis of the ages of the stars in the Upper Scoripus indicate that the star is approximately 11 million years old.

Star informationEdit

Observation DataEdit

  • Constellation: Scorpius
  • Right ascension: 16h 09m 30.3s
  • Declination: −21° 04′ 58″


  • Spectral type: K7V
  • Variable type: T Tauri star


  • Distance: 470 light years (145 parasecs)


  • Mass: 0.85 Solar mass
  • Radius: 1.35 Solar radius
  • Temperature: 4060 K (6848 °F, 3786 °C)
  • Age: 5 million years

Other desginationsEdit

  • 1RXS J160929.1−210524
  • 2MASS J16093030-2104589
  • GSC 06213-01358

Planetary systemEdit

On September 8th, 2008, it was announced that astronomer David Lafreniere and collaborators used the Gemini OBservatory to take pictures of the star, which appeared to show a planet. The apparent planet is very large - about eight times the mass of Jupiter, orbiting the star at a distance of 330 AU (roughly 31 billion miles). The orbital status of the companion planet was confirmed in a paper submitted on June 15, 2010 to the Astrophysical Journal. This would make it the smallest known exoplanet orbiting its star at such a distance.


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