Upsilon Andromedae

3.6 L ☉ [NB 2]

Upsilon Andromedae ( υ And, Gliese 61) is a fixed star of spectral type 4,09 likes bright F8 V in the constellation Andromeda. It is 44 light years away from our sun.

Properties

In 2002 it was discovered that Upsilon Andromedae is actually a binary star system. At a distance of about 750 AU from the luminous stronger component, Upsilon Andromedae A, is the red dwarf of spectral type M4, 5 Upsilon Andromedae B.

Planetary system

In April 1999, discovered the professor Debra Fisher of the University of San Francisco that Upsilon Andromedae is circled by three giant planets. All are believed to be massive gas planet similar to Jupiter in the solar system. Upsilon Andromedae is regarded as the first star in which from a real planetary system so far three planets was found.

The first planet Upsilon Andromedae b, orbits its parent star every 4.6 days at a distance of about 0.059 AU (about 9106 km ), it has about 75 percent the mass of Jupiter. It is followed by Upsilon Andromedae c with at least twice the mass of Jupiter in an orbit with a semimajor axis of 0.8 AU and an orbital period of 242 days. The outermost known planet Upsilon Andromedae d is about 2.5 AU from at least four times the mass of Jupiter and an orbit of 3.5 to 4 years.

Swell

• Individual fourth star size
• Andromeda ( constellation )
• Star with exoplanet
• Binary star