19h20m47.98349s, −45° 33′ 29.6292″| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 19h20m 47.98349s[1] |
| Declination | −45° 33′ 29.6292″[1] |
| Apparent magnitude (V) | 12.25[2] |
| Characteristics | |
| Spectral type | M4V[2] |
| Astrometry | |
| Radial velocity (Rv) | +6.8[3] km/s |
| Proper motion (μ) | RA: +659.330[1] mas/yr Dec.: −2,897.035[1] mas/yr |
| Parallax (π) | 169.2351 ± 0.0588 mas[4] |
| Distance | 19.272 ± 0.007 ly (5.909 ± 0.002 pc) |
| Details[3] | |
| Mass | 0.173 M☉ |
| Radius | 0.205 R☉ |
| Luminosity | 0.005[5] L☉ |
| Temperature | 3,202±100[6] K |
| Metallicity [Fe/H] | −0.169[6] dex |
| Rotation | 132.651 days |
| Other designations | |
GJ 754, L 347-14, LHS 60, LTT 7652, 2MASS J19204795-4533283[7] | |
| Database references | |
| SIMBAD | data |
  Gliese 754 Location of Gliese 754 in the constellation Telescopium | |
Gliese 754 is a dim star in the southern constellationofTelescopium. It has an apparent visual magnitude of 12.25,[2] which requires a telescope to view. The star is located at a distance of 19.3 light-years from the Sun based on parallax,[1] and it is drifting further away with a radial velocity of +7 km/s.[3] It is one of the hundred closest stars to the Solar System. Calculations of its orbit around the Milky Way showed that it is eccentric, and indicate that it might be a thick disk object.[8]
The stellar classification of Gliese 754 is M4V,[2] indicating that this is a small red dwarf star on the core hydrogen fusing main sequence. It has 17% of the mass of the Sun and 21% of the Sun's radius.[3] The star is fully convective and is a source of X-ray emission.[9] It is rotating slowly with a period of about 133 days.[3] The metallicity is sub-solar,[6] indicating it has a lower abundance of heavy elements compared to the Sun. It is radiating just 0.5%[5] of the luminosity of the Sun from its photosphere at an effective temperature of around 3,202 K.[6]
In June 2019, a candidate exoplanet was reported in orbit around Gliese 754. It was detected using the Doppler method and is orbiting at a distance of 0.28 AU with a period of 78 days. The orbit is essentially circular, to within the margin of error.[10] The habitable zone for this star ranges from 0.05 AUto0.14 AU;[5] inside the orbit of this proposed companion.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (unconfirmed) | ≥9.8+4.6 −5.2 M🜨 |
0.277+0.025 −0.028 |
78.37+0.55 −0.47 |
0.03+0.20 −0.03 |
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