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Gliese 328, also known as BD+02 2098, is a M-type main-sequence star located 66.9 light-years (20.5 parsecs) away in the constellation Hydra. Its surface temperature is 3989 K. Gliese 328 is depleted in heavy elements compared to the Sun, with a metallicity Fe/H index of −0.13.[5] The age of the star is unknown. Gliese 328 exhibits an activity cycle similar to that of the Sun, with a period around 2000 d.[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 08h 55m 07.62173s[1] |
| Declination | +01° 32′ 47.4151″[1] |
| Apparent magnitude (V) | 9.997[2] |
| Characteristics | |
| Evolutionary stage | main-sequence star |
| Spectral type | M0V[2] |
| B−V color index | 1.30[2] |
| Astrometry | |
| Radial velocity (Rv) | −3.731±0.0015[3] km/s |
| Proper motion (μ) | RA: 44.944 mas/yr[1] Dec.: −1045.876 mas/yr[1] |
| Parallax (π) | 48.7404 ± 0.0184 mas[1] |
| Distance | 66.92 ± 0.03 ly (20.517 ± 0.008 pc) |
| Details[2] | |
| Mass | 0.65±0.08 M☉ |
| Radius | 0.63±0.07 R☉ |
| Luminosity | 0.08 L☉ |
| Surface gravity (log g) | 4.64±0.07 cgs |
| Temperature | 3897±71 K |
| Metallicity [Fe/H] | −0.06±0.09 dex |
| Rotation | 33.6 days[4] |
| Other designations | |
| Database references | |
| SIMBAD | data |
Multiplicity surveys did not detect any stellar companions as of 2016.[6]
In 2013, one superjovian planet, named Gliese 328 b, was discovered on a wide, eccentric orbit by the radial velocity method.[7] The known planetary orbit is wide enough to not disrupt orbits of other bodies in the habitable zone of the star.[8] In 2023, a second, Neptune-mass planet was discovered orbiting closer to the star.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| c | ≥21.4+3.4 −3.2 M🜨 |
0.657+0.026 −0.028 |
241.8+1.3 −1.7 |
— | — | — |
| b | ≥2.51±0.23 MJ | 4.11+0.16 −0.18 |
3771±17 | 0.227±0.015 | — | — |
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