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Gliese 674 (GJ 674) is a small red dwarf star with an exoplanetary companion in the southern constellation of Ara. 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 14.85 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.[10]
  Gliese 674 Location of Gliese 674 in the constellation Ara | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ara |
| Right ascension | 17h 28m 39.94558s[1] |
| Declination | –46° 53′ 42.6881″[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: 572.568(40) mas/yr[1] Dec.: −880.583(27) mas/yr[1] |
| Parallax (π) | 219.6463 ± 0.0262 mas[1] |
| Distance | 14.849 ± 0.002 ly (4.5528 ± 0.0005 pc) |
| Absolute magnitude (MV) | 11.09[2] |
| Details | |
| Mass | 0.353±0.008[6] M☉ |
| Radius | 0.361+0.012 −0.011[6] R☉ |
| Luminosity | 0.01575±0.00037[6] L☉ |
| Temperature | 3,404+59 −57[6] K |
| Metallicity [Fe/H] | −0.30±0.08[6] dex |
| Rotation | 32.9±0.1 d[7] |
| Rotational velocity (v sin i) | 3.2±1.2[3] km/s |
| Age | 0.1–1.0[8] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | The star |
| b | |
| Exoplanet Archive | data |
| ARICNS | data |
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.[11] It is smaller and less massive than the Sun, and is radiating just 1.6%[8] of the Sun's luminosity from its photosphere at an effective temperature of 3,404 K.[6]
On January 7, 2007, Bonfils et al. used the HARPS spectrograph in ESO and found an intermediate mass planet orbiting close to the red dwarf star in an eccentric orbit.[8] This system is a promising candidate for detecting radio emission caused by interaction between the planet and the stellar wind.[12] No additional planets were found as of 2024.[13]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥10.95±0.14 M🜨 | 0.03867087(15) | 4.69502±0.00003 | 0.242+0.012 −0.013 |
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