HD 115404
Binary star in the constellation Coma Berenices
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HD 115404 is a binary star system located in the constellation Coma Berenices. Parallax measurements made by Hipparcos put the system at 36 light-years, or 11 parsecs, away.[18] The combined apparent magnitude of the system is 6.52,[17] with the magnitudes of the components being 6.66 and 9.50.[3]
The primary component, designated A, is a K-type main sequence star.[5] It is about 70% as massive as the Sun, and is 0.76 times as wide.[12] Its companion is a red dwarf (M0.5 V).[7] It has 54.2% the mass of the Sun, and is 0.55 times as wide.[14] The two stars orbit each other every 770 years, and are separated by about 8″.[11] The system is thought to be fairly old, at 5.4 to 13.5 billion years old.[12]
In 2022, two exoplanets, Neptunian and super-Jovian in mass, were reported in orbit around the primary star using a combination of radial velocity and astrometry.[19] However, a 2025 study using radial velocity observations failed to detect these planets.[20]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (disputed[20]) | ≥0.097+0.020 −0.022 MJ |
0.088+0.003 −0.004 |
10.5+0.001 −0.002 |
0.232+0.197 −0.138 |
— | — |
| c (disputed[20]) | 10.319+1.473 −1.209 MJ |
11.364+3.301 −1.905 |
15319.2+7240.3 −3526.2 |
0.211+0.173 −0.102 |
25.791+1.842 −2.157° |
— |