Phi² Pavonis also known as HD 196378, is a yellow-white dwarf

Yellow-white dwarf

An F-type main-sequence star is a main-sequence, hydrogen-fusing star of spectral type F and luminosity class V. These stars have from 1.0 to 1.4 times the mass of the Sun and surface temperatures between 6,000 and 7,600 K., Tables VII and VIII. This temperature range gives the F-type stars a...

 star

Star

A star is a massive, luminous sphere of plasma held together by gravity. At the end of its lifetime, a star can also contain a proportion of degenerate matter. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth...

 approximately 82 light-year

Light-year

A light-year, also light year or lightyear is a unit of length, equal to just under 10 trillion kilometres...

s away in the constellation

Constellation

In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....

 of Pavo

Pavo (constellation)

Pavo is a constellation in the southern sky. Its name is Latin for peacock. It is one of twelve constellations created by Petrus Plancius from the observations of Pieter Dirkszoon Keyser and Frederick de Houtman and it first appeared on a 35-cm diameter celestial globe published in 1597 in...

 (the Peacock). It is evolving into a subgiant.

This system was in 1991 a test case for the Zeta Herculis moving group

Zeta Herculis Moving Group

Zeta Herculis Moving Group is a set of stars that share a common motion through space.The existence of this moving group was first published in 1958 by Olin J. Eggen. Based upon the high velocity motion of the star Zeta Herculis through space, he searched for stars that were following a similar...

, of low metallicity stars with 5 billion years of age. This group includes besides Zeta Herculis: δ Trianguli

Delta Trianguli

Delta Trianguli is a spectroscopic binary star system approximately away in the constellation of Triangulum. The primary star is a yellow dwarf, while the secondary star is thought to be an orange dwarf...

, ζ Reticuli

Zeta Reticuli

Zeta Reticuli is a binary star system located about away from Earth. It is located in the constellation Reticulum, and is visible to the unaided eye in very dark skies...

, 1 Hydrae, Gl 456, Gl 678

Gliese 678

Gliese 678 is a spectroscopic binary star system approximately 60 light-years away in the constellation of Ophiuchus.This system is in the Zeta Herculis moving group, which is of low metallicity stars, 5 billion years old...

, and Gl 9079.

In 1998, using the European Southern Telescope in Chile, a planet

Extrasolar planet

An extrasolar planet, or exoplanet, is a planet outside the Solar System. A total of such planets have been identified as of . It is now known that a substantial fraction of stars have planets, including perhaps half of all Sun-like stars...

was announced to be orbiting the star. This team retracted this claim in 2002, but found a different periodicity of 7 days possibly due to stellar rotation.

External links

• Phi2 Pavonis at Extrasolar Visions (listed as "controversial" here and not updated before 2005)