17h28m39.9463s, −46° 53′ 42.685″| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ara |
| Right ascension | 17h28m 39.9455s[1] |
| Declination | –46° 53′ 42.6932″[1] |
| Apparent magnitude (V) | 9.38[2] |
| Characteristics | |
| Spectral type | M3V[3] |
| U−B color index | 1.20[4] |
| B−V color index | 1.553±0.017[2] |
| R−I color index | 1.33[4] |
| Astrometry | |
| Radial velocity (Rv) | −2.904±0.0004[5] km/s |
| Proper motion (μ) | RA: 572.582±0.102 mas/yr[1] Dec.: −880.251±0.068 mas/yr[1] |
| Parallax (π) | 219.6463 ± 0.0262 mas[6] |
| Distance | 14.849 ± 0.002 ly (4.5528 ± 0.0005 pc) |
| Absolute magnitude (MV) | 11.09[2] |
| Details | |
| Mass | 0.353±0.008[7] M☉ |
| Radius | 0.361+0.012 −0.011[7] R☉ |
| Luminosity | 0.01575±0.00037[7] L☉ |
| Temperature | 3,404+59 −57[7] K |
| Metallicity [Fe/H] | −0.30±0.08[7] dex |
| Rotation | 32.9±0.1 d[8] |
| Rotational velocity (v sin i) | 3.2±1.2[3] km/s |
| Age | 0.1–1.0[9] Gyr |
| Other designations | |
CD−46°11540, GJ 674, HIP 85523, LFT 1351, LHS 449, LPM 645, LTT 6942[10] | |
| Database references | |
| SIMBAD | The star |
| b | |
| Exoplanet Archive | data |
| ARICNS | data |
  Gliese 674 Location of Gliese 674 in the constellation Ara | |
Gliese 674 (GJ 674) is a small red dwarf star with an exoplanetary companion in the southern constellationofAra. It is too faint to be visible to the naked eye, having an apparent visual magnitude of 9.38[2] and an absolute magnitude of 11.09.[2] The system is located at a distance of 14.8 light-years from the Sun based on parallax measurements,[1] but is drifting closer with a radial velocity of −2.9 km/s.[5] It is a candidate member of the 200 million year old Castor stream of co-moving stars.[11]
This is a low-mass M-type main-sequence star with a stellar classification of M3V.[3] The star is weakly active and show star spots on a regular basis. Even low activity red dwarfs can flare, and in 2018 this star was observed emitting a hot ultraviolet flare with a total energy of 5.6×1023 Joules and a duration of a few hours. GJ 674 is at an intermediate stage of spin-down with a rotation period of 33.4 days, suggesting an age of up to a few billion years.[12] It is smaller and less massive than the Sun, and is radiating just 1.6%[9] of the Sun's luminosity from its photosphere at an effective temperature of 3,404 K.[7]
On January 7, 2007, Bonfils used the HARPS spectrograph in ESO and found an intermediate mass planet orbiting close to the red dwarf star in an eccentric orbit.[9] This system is a promising candidate for detecting radio emission caused by interaction between the planet and the stellar wind.[13]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥11.8 M🜨 | 0.039 | 4.6938 ± 0.007 | 0.2 ± 0.02 | — | — |
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