CD−44 170

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.^[6]

CD−44°170

Observation data Epoch J2000      Equinox J2000
Constellation	Phoenix
Right ascension	00h 39m 58.8243s[1]
Declination	−44° 15′ 11.5824″[1]
Apparent magnitude (V)	11.401
Characteristics
Evolutionary stage	main-sequence star
Spectral type	M0.5V[2]
Astrometry
Radial velocity (Rv)	11.85±0.19[3] km/s
Proper motion (μ)	RA: 483.002[3] mas/yr Dec.: −221.111[3] mas/yr
Parallax (π)	42.3320±0.0248 mas[3]
Distance	77.05 ± 0.05 ly (23.62 ± 0.01 pc)
Details
Mass	0.53[2] M☉
Radius	0.52[4] R☉
Luminosity	0.04597±0.00087[5] L☉
Temperature	3604±72[6] K
Metallicity [Fe/H]	−0.09±0.09[6] dex
Rotation	31.8 d[2]
Other designations
Gaia DR2 4980466929964496128, GJ 27.1, HIP 3143, TYC 7531-1014-1, 2MASS J00395880-4415117[1]
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.^[7] The planetary equilibrium temperature is 406 K (271 °F; 133 °C).^[5] The planet's existence was doubted until 2020 because the putative orbital period is equal to half of the star's rotational period.^[2]

The Gliese 27.1 planetary system^[5]

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🜨