Epsilon Eridana b

Epsilon Eridanus b or Egir ^[1] is an exoplanet discovered in the sun-like star Epsilon Eridanus , located about 10.5 light-years from the solar system in the constellation Eridanus .

Epsilon Eridana b
Exoplanet
Epsilon Eridana b. Submission of the artist.
Parent star
Star	Epsilon Eridan
Constellation	Eridan
Right Ascension ( α )
Declination ( δ )
Visible magnitude ( m V )	3.73
Distance	10.5 ± 0.03 St. of the year (3.218 ± 0.009 pc )
Spectral class	K2V
Elements of the orbit
Semimajor axis ( a )	~ 3.4 a. e.
Orbital Period ( P )	~ 2500 d.
physical characteristics
Weight ( m )	~ 1,56 M J
Radius ( r )	? R j
Discovery Information
opening date	August 7, 2000
Discoverer (s)	Arti Hatzes
Detection method	Doppler Method
Opening place	USA
Opening status	Not confirmed
Other designations
18 Eridani b, Gliese 144 b, HD 22049 b, HIP 16537 b, HR 1084 b

In 2000, the team of Arti Hatzes announced the discovery of a Jupiter-like planet Epsilon Eridanus with a mass of 1.2 ± 0.33 of the mass of Jupiter, orbiting a star at an average distance of 3.3 a. e. in a very elongated orbit. However, other observers, including Jeffrey Marcy believed that this conclusion requires more information about the behavior of the Doppler noise of a star created by its strong alternating magnetic field, and the existence of the planet for a long time remained only an assumption. However, such an assumption was made in the early nineties by Bruce Campbell and Gordon Walker, but their observations did not allow us to draw firm conclusions about the orbit and properties of the planet.

Observations made using the Hubble Space Telescope confirmed the existence of an exoplanet. Its estimated mass is 1.55 ± 0.24 masses of Jupiter, the inclination of the orbit is 30.1 ± 3.8 °, the eccentricity is 0.702 ± 0.039, the semi-major axis is 3.39 ± 0.36 a according to the updated data. e., the circulation period of about 2500 earth days . The plane of the planet’s orbit is parallel to the plane of the star’s dust disk. It was expected that it would reach the periastron in 2007 , which would create the best conditions for observation using the space telescope.