Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Telescopium |
Right ascension | 19h 20m 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 | |
Database references | |
SIMBAD | data |
Location of Gliese 754 in the constellation
Telescopium |
Gliese 754 is a dim star in the southern constellation of Telescopium. 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 AU to 0.14 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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Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Telescopium |
Right ascension | 19h 20m 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 | |
Database references | |
SIMBAD | data |
Location of Gliese 754 in the constellation
Telescopium |
Gliese 754 is a dim star in the southern constellation of Telescopium. 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 AU to 0.14 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 |
— | — |
{{
cite journal}}
: Cite journal requires |journal=
(
help)