Gamma Cephei A

Gamma_Cephei_Planetary_System.html · captured from wingmakers.co.nz

This page makes checkable claims — observational astronomy, with names, magnitudes and distances that can be looked up.

g Cep is a double star system consisting of a K1 IV primary and a M1secondary.
Data on the secondary is:

Spectral Type: M1 V?
Mass: 0.4 Solar Masses
Radius: 0.5 Solar Radii
Surface Temperature: 3500 K
Orbital Period about Primary: 74 years
Distance from Primary: 12-32 AU
Orbital Eccentricity: 0.44
Angle of Periastron: 162.1 degrees

Star Statistics

Alternate Designations: Errai HD 222404
Distance from Sun: 11.8 Parsecs
Right Ascension: 23 39 20.8490
Declination: +77 37 56.193
Spectral Type: K1 IV
Apparent Magnitude: 3.225
Mass: 1.59 Solar Masses
Radius: 4.7 Solar Radii
Surface Temperature: 4900 Kelvins
Age: 3000 Million Years

System Components
(Mass in Multiples of Jupiter's Mass)

gamma Cephei b
Jovian Planet

Comments
gamma Cephei b is the first planet discovered in a close binary star system. At their closest, the two stars are only 12 AU from each other, proving that such close systems can support planets. This discovery also ups the likely number of planets in the galaxy as most stars are in double or triple star systems.

Statistics

Star System: gamma Cephei
Discovery Status: Confirmed
Mass: 1.76 Jupiters
Average Distance: 2.1 AUs
Minimum Distance: 1.7 AUs
Maximum Distance: 2.5 AUs
Period: 903 Days
Orbital Eccentricity: 0.2
Argument of Perihelion (omega): 76°
Tug on Star: 26.3 m/s
Detection Method: Doppler Spectroscopy
Discovered By: COCHRAN W., HATZES A., ENDL M., PAULSON D.
, WALKER G., CAMPBELL B. & YANG S.
Year Discovered: Sep 2002

Planetary Orbit

4.2 AUs
Position In Cepheus