CD−44 170
Star in the constellation Phoenix
From Wikipedia, the free encyclopedia
CD−44 170, also known as Gliese 27.1, Gliese 9018 and HIP 3143, is an M-type main-sequence star. Its surface temperature is 3,604 K (6,028 °F; 3,331 °C)±72 K. The star's concentration of heavy elements is similar to that of the Sun.[8]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Phoenix[1] |
| Right ascension | 00h 39m 58.8236s[2] |
| Declination | −44° 15′ 11.577″[2] |
| Apparent magnitude (V) | 11.401[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | M0.5V[4] |
| Astrometry | |
| Radial velocity (Rv) | 11.85±0.19[2] km/s |
| Proper motion (μ) | RA: 483.002[2] mas/yr Dec.: −221.111[2] mas/yr |
| Parallax (π) | 42.3320±0.0248 mas[2] |
| Distance | 77.05 ± 0.05 ly (23.62 ± 0.01 pc) |
| Absolute magnitude (MV) | +9.51[1] |
| Details | |
| Mass | 0.53[4] M☉ |
| Radius | 0.52[5] R☉ |
| Luminosity | 0.04597±0.00087[6] L☉ |
| Surface gravity (log g) | 4.73[7] cgs |
| Temperature | 3604±72[8] K |
| Metallicity [Fe/H] | −0.09±0.09[8] dex |
| Rotation | 31.8 d[4] |
| Rotational velocity (v sin i) | 2.00[9] km/s |
| Age | 8.27±4.08[7] Gyr |
| Other designations | |
| GJ 27.1, HIP 3143, TYC 7531-1014-1, 2MASS J00395880-4415117, Gaia DR2 4980466929964496128[10] | |
| Database references | |
| SIMBAD | data |
Planetary system
In 2014, a planet named Gliese 27.1 b with an orbital period of 16 days was announced. It was discovered using the radial velocity method.[11] The planetary equilibrium temperature is 406 K (271 °F; 133 °C).[6] The planet's existence was doubted until 2020 because the putative orbital period is equal to half of the star's rotational period.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (disputed) | > 13+4.1 −6.6 M🜨 |
0.101+0.009 −0.013 |
15.8190+0.0049 −0.0026 |
— | — | >3.63 R🜨 |
