Gliese 328
Gliese 328, also known as BD+02 2098, is a M-type main-sequence star. 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.[4] 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.[5]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 08h 55m 07.6219s[1] |
| Declination | 01° 32′ 47.4165″[1] |
| Apparent magnitude (V) | 9.997 |
| Characteristics | |
| Evolutionary stage | main-sequence star |
| Spectral type | M0V |
| Astrometry | |
| Radial velocity (Rv) | −3.731±0.0015[1] km/s |
| Proper motion (μ) | RA: 44.944[2] mas/yr Dec.: −1045.876[2] mas/yr |
| Parallax (π) | 48.7404 ± 0.0184[2] mas |
| Distance | 66.92 ± 0.03 ly (20.517 ± 0.008 pc) |
| Details[3] | |
| Mass | 0.69 M☉ |
| Luminosity | 0.10 L☉ |
| Surface gravity (log g) | 4.59[4] cgs |
| Temperature | 3989 K |
| Metallicity [Fe/H] | −0.13[4] dex |
| Rotation | 33.6[5] |
| Other designations | |
| Database references | |
| SIMBAD | data |
Multiplicity surveys did not detect any stellar companions as of 2016.[6]
Planetary system
In 2013, one superjovian planet, named Gliese 328b, was discovered on a wide, highly 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.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >2.3 MJ | 4.43 | 4100 | 0.29±0.04 | — | — |
References
- "BD+02 2098". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-02-03.
- Brown, A. G. A.; et al. (Gaia collaboration). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics (in press). arXiv:2012.01533. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
- Kokaia, Giorgi; Davies, Melvyn B.; Mustill, Alexander J. (2020), "Resilient habitability of nearby exoplanet systems", Monthly Notices of the Royal Astronomical Society, 492 (1): 352–368, arXiv:1910.07573, Bibcode:2020MNRAS.492..352K, doi:10.1093/mnras/stz3408, S2CID 204743669
- Wallerstein, George; Woolf, Vincent M. (2020), "The M dwarf problem: Fe and Ti abundances in a volume-limited sample of M dwarf stars", Monthly Notices of the Royal Astronomical Society, 494 (2): 2718–2726, arXiv:2003.11447, Bibcode:2020MNRAS.494.2718W, doi:10.1093/mnras/staa878, S2CID 214641078
- Küker, M.; Rüdiger, G.; Olah, K.; Strassmeier, K. G. (2019), "Cycle period, differential rotation and meridional flow for early M dwarf stars", Astronomy & Astrophysics, 622: A40, arXiv:1804.02925, Bibcode:2019A&A...622A..40K, doi:10.1051/0004-6361/201833173, S2CID 118842388
- Ginski, C.; Mugrauer, M.; Seeliger, M.; Buder, S.; Errmann, R.; Avenhaus, H.; Mouillet, D.; Maire, A.-L.; Raetz, S. (2016), "A lucky imaging multiplicity study of exoplanet host stars II", Monthly Notices of the Royal Astronomical Society, 457 (2): 2173–2191, arXiv:1601.01524, Bibcode:2016MNRAS.457.2173G, doi:10.1093/mnras/stw049, S2CID 53626523
- Robertson, Paul; Endl, Michael; Cochran, William D.; MacQueen, Phillip J.; Boss, Alan P. (2013), "Secretly Eccentric: The Giant Planet and Activity Cycle of GJ 328", The Astrophysical Journal, 774 (2): 147, arXiv:1307.7640, Bibcode:2013ApJ...774..147R, doi:10.1088/0004-637X/774/2/147, S2CID 118514735
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