HD 154088
17h 04m 27.84s, −28° 34′ 57.64″| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 17h 04m 27.84s ± 5.62[1] |
| Declination | −28° 34′ 57.64″ ± 3.16[1] |
| Apparent magnitude (V) | 6.7258 ± 0.005[1] |
| Characteristics | |
| Spectral type | K0V |
| B−V color index | 0.814 ± 0.034[1] |
| Absolute magnitude (MV) | 5.47 ± 0.02 |
| Details | |
Gyr | |
HIP 83541, SAO 184990 | |
| Database references | |
| SIMBAD | data |
HD 154088 is a seventh magnitude metal-rich
Properties
HD 154088 is a modestly bright star that lies at the bottom of Ophiuchus, near to the border with Scorpius and near to the plane of the Milky Way. The star was recognised as a high proper motion star during the last century, and early Earth-based parallax measurements such as that of the Gliese Catalogue of Nearby Stars indicated a distance of about 50 light-years.
The star has a spectral type of K0V, indicating that it is a main sequence star that is about 350 degrees cooler than the Sun. On the
HD 154088 has a pronounced magnetic field.[3] It also has a magnetic cycle similar to the Sun,[6] though its length is not well constrained.
The survey in 2015 have ruled out the existence of any additional stellar companions at projected distances from 8 to 119 astronomical units.[7]
Planetary system
A planet orbiting HD 154088 discovered with the HARPS spectrograph was announced in September 2011. With a minimum mass of 6 Earth masses, the companion falls into the regime of Super-Earths.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥6.15 ± 0.86 M🜨 | 0.1316 ± 0.0021 | 18.596 ± 0.021 | 0.38 ± 0.15 | — | — |
HD 154088 is also being observed under the Keck Eta-Earth radial velocity survey.[8] HD 154088 b is a close match for planet candidate 1 (orbital period = 18.1 days, minimum mass = 6.5 M🜨), so they may be the same detection. The planet existence was finally confirmed in 2021.[9]
References
- ^ S2CID 18759600.
- ^ )
- ^ S2CID 53377473.
- S2CID 18775378.
- ^ doi:10.1086/430500.
- ^ )
- hdl:1887/49340. Retrieved 19 June 2020.
- S2CID 34792507.
