Gliese 674

Gliese 674 (Gliese–Jahreiß 674) is a pre-main-sequence red dwarf approximately 15 light years away in the southern constellation of Ara. Gliese 674, as is typical for young red dwarfs, is strongly active, with regular ultraviolet flares. As of 2019, the strongest ultraviolet flare detected had a total energy of 5.6*1023 joules and a duration of a few hours.[3]

Gliese 674
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension  17h 28m 39.9455s[1]
Declination –46° 53′ 42.6932″[1]
Apparent magnitude (V) 9.38
Characteristics
Spectral type M3V
U−B color index 1.22
B−V color index 1.55
R−I color index 1.03
Astrometry
Radial velocity (Rv)−10.5 ± 1.3 km/s
Proper motion (μ) RA: 572.582±0.102[1] mas/yr
Dec.: −880.251±0.068[1] mas/yr
Parallax (π)219.8012 ± 0.0487[1] mas
Distance14.839 ± 0.003 ly
(4.550 ± 0.001 pc)
Absolute magnitude (MV)11.06
Details
Mass0.35 M☉
Radius0.41-0.43 R☉
Luminosity0.016 L☉
Surface gravity (log g)570 m/s2 (58.1 g) cgs
Temperature3600 ± 100 K
Metallicity−0.28
Rotation32.9±0.1 d[2]
Age0.55 ± 0.45 Gyr
Other designations
GJ 674, CD -46°11540, GCTP 3958.00, LHS 449, LFT 1351, LTT 6942, LPM 645, HIP 85523.
Database references
SIMBADThe star
b
Exoplanet Archivedata
ARICNSdata
Extrasolar Planets
Encyclopaedia		data

Planetary system

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 unusually eccentric orbit.[4]

The Gliese 674 planetary system
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 — —

See also
  • List of nearest stars
  • List of extrasolar planets

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Suárez Mascareño, A.; et al. (September 2015), "Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators", Monthly Notices of the Royal Astronomical Society, 452 (3): 2745–2756, arXiv:1506.08039, Bibcode:2015MNRAS.452.2745S, doi:10.1093/mnras/stv1441.
  3. Froning, C. S.; Kowalski, A.; France, K.; Parke Loyd, R. O.; Christian Schneider, P.; Youngblood, A.; Wilson, D.; Brown, A.; Berta-Thompson, Z.; Sebastian Pineda, J.; Linsky, J.; Rugheimer, S.; Miguel, Y. (2019). "A Hot Ultraviolet Flare on the M Dwarf Star GJ 674". arXiv:1901.08647 [astro-ph.SR].
  4. Bonfils, X.; et al. (2007). "The HARPS search for southern extra-solar planets. X. A m sin i = 11 M_⊕ planet around the nearby spotted M dwarf GJ 674". Astronomy and Astrophysics. 474 (1): 293–299. arXiv:0704.0270. Bibcode:2007A&A...474..293B. doi:10.1051/0004-6361:20077068.

Notes


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