Errai (Gamma Cephei) (stars.astro.illinois.edu)

author

Jim Kaler

excerpt

Errai (Gamma Cephei) is the among the visually brightest stars to host a planet, and also has a low mass companion with a relatively small orbit.

path on GitHub

https://github.com/davepinch/pinchy.cc/blob/master/content/sites/stars.astro.illinois.edu/sow/errai/errai.md

random

Crux

retrieved

2024-06-25

snippets

The planet, with a mass of at least 1.85 times that of Jupiter, is one of the few known to lie within a double-star system, and orbits the main star Gamma Cephei A with a period of 2.47 years at an average distance of 2.05 Astronomical Units (307 million kilometers, 191 million miles)
“Errai” comes from Arabic and means “the Shepherd.”
With a mass estimated to be 1.6 times that of the Sun, the star’s core is quietly fusing helium into carbon and oxygen.
Gamma Cephei is accompanied by a low mass companion (a red dwarf with a mass around 0.3 or 0.4 solar masses) that orbits with a period between 57 and 66 years at a distance of about 19 AU.
From the planet, the secondary star would shine with the light of a couple dozen full Moons.

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Gamma Cephei

tags

STARS by Jim Kaler
website

website

http://stars.astro.illinois.edu/sow//errai.html