Theta Cygni is a white main sequence star, spectral class F3 V, forming a wide binary system

Binary system

Binary system may refer to:* Binary numeral system, the base-2 internal "machine language" of computers* Binary opposition, a bipolar distinction in philosophy, structuralism and critical theory...

 with a dim red dwarf star, of spectral type M3. The primary component of binary is suspected to host an extrasolar 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...

.

Planetary companion?

Weird radial velocity variations have been detected by ELODIE team for search of extrasolar planets. Desort et al. (2009) infer these variations are not due to perturbing dim stellar companion roughly 80 Astronomical Units away from the star, but suggesting the presence of a perturbing planetary

Planetary

Planetary means relating to a planet or planets. It can also refer to:* Planetary , a comic book series by Warren Ellis and John Cassaday* Planetary habitability, the measure of an astronomical body's potential to develop and sustain life...

 object, twice more massive than Jupiter

Jupiter

Jupiter is the fifth planet from the Sun and the largest planet within the Solar System. It is a gas giant with mass one-thousandth that of the Sun but is two and a half times the mass of all the other planets in our Solar System combined. Jupiter is classified as a gas giant along with Saturn,...

 and revolving around the stars in less than half a year. The extrasolar 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...

 is still to be confirmed.