TOI-1278 b is an exoplanet orbiting the star TOI-1278, located 246.1 light-years (parsecs) from the Solar System, and was announced in 2021.
The star TOI-1278 has an apparent magnitude of 13.5 and an absolute magnitude of 9.1.
This star has 0.6 times the mass of the Sun, a radius of 0.6 times that of the Sun, a surface temperature of 3,799 K, and a spectral type of MOV.
In this star’s planetary system, TOI-1278 b orbits the star TOI-1278 with an orbital period of 14.5 days and a semi-major axis of 0.10 astronomical units (14,211,797.7 km).
TOI-1278b was announced in 2021. It is a gas giant orbiting the M-type star TOI-1278, located in the constellation Cygnus, approximately 246.1 light-years (75.5 parsecs) from the Solar System. It has a mass 18.5 times that of Jupiter and a radius 1.09 times that of Jupiter. It takes 14.5 days to complete one orbit around its star and is located at a distance of 0.095 astronomical units from it. Such a close proximity to the star is characteristic among known M-dwarf systems.
The “TOI” in a star’s name stands for “Tess Objects of Interest” and refers to a catalog of celestial objects for which the TESS exoplanet-hunting satellite has indicated the potential presence of planets. Celestial objects listed in the TOI catalog undergo follow-up observations using methods other than the transit method, such as Doppler spectroscopy and direct imaging. (文責：小川)
References：
Artigau et al. 2021., TOI–1278 B: SPIRou Unveils a Rare Brown Dwarf Companion in Close-in Orbit around an M Dwarf, The Astronomical Journal 162 144
https://exoplanets.nasa.gov/exoplanet-catalog/
For more information about TOI-1278 b, please visit the Exokyoto database page below.
TOI-1278 b (exoplanetkyoto.org)
