# HD 147379

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Visual binary in constellation Draco

HD 147379 Location of HD 147379 (circled) Observation data Epoch J2000 Equinox ICRS Constellation Draco[1][2] HD 147379A Right ascension 16h 16m 42.74635s[3] Declination +67° 14′ 19.8316″[3] Apparent magnitude (V) 8.9[4] HD 147379B Right ascension 16h 16m 45.31448s[5] Declination +67° 15′ 22.4811″[5] Apparent magnitude (V) 10.69-10.74[6] Characteristics HD 147379A Evolutionary stage main sequence[3] Spectral type M0.0V[4] B−V color index 1.11[4] J−H color index 0.643[7] J−K color index 0.826[7] HD 147379B Spectral type M3V[8] J−H color index 0.608[7] J−K color index 0.842[7] Variable type BY Draconis variable[6] Astrometry HD 147379A Radial velocity (Rv) −18.962±0.0011[9] km/s Proper motion (μ) RA: −497.915[3] mas/yr Dec.: 84.047[3] mas/yr Parallax (π) 92.8766±0.0146 mas[3] Distance 35.117 ± 0.006 ly (10.767 ± 0.002 pc) Absolute magnitude (MV) +8.47[1] HD 147379B Radial velocity (Rv) −18.36±0.0008[10] km/s Proper motion (μ) RA: −483.006[5] mas/yr Dec.: 89.049[5] mas/yr Parallax (π) 92.8985±0.0160 mas[5] Distance 35.109 ± 0.006 ly (10.764 ± 0.002 pc) Absolute magnitude (MV) +10.54[2] Orbit[4] Primary HD 147379A Name HD 147379B Semi-major axis (a) 64.4" (693.4 AU) Details[11] HD 147379A Mass 0.58±0.08 M☉ Radius 0.57±0.06 R☉ Luminosity 0.1069±0.0153[12] L☉ Surface gravity (log g) 4.609±0.012[4] cgs Temperature 4090±50 K Metallicity [Fe/H] 0.16±0.16 dex Rotation 22 d[13] Age 5.1+3.2 −2.4[14] Gyr HD 147379B Mass 0.45±0.02[8] M☉ Radius 0.460±0.008[8] R☉ Luminosity 0.02645±0.00645[15] L☉ Surface gravity (log g) 4.84±0.06[8] cgs Temperature 3525±31[8] K Metallicity [Fe/H] 0.20±0.10[8] dex Rotation 40.4±3.0 d[8] Rotational velocity (v sin i) 0.50[8] km/s Other designations GJ 617, HD 147379, WDS J16167+6714 HD 147379A: AG+67°695, BD+67°935, GC 21949, HIP 79755, G 257-32, G 225-57, G 240-14, LHS 3175, LSPM J1616+6714, LTT 14863, NLTT 42488, TIC 230073581, TYC 4195-721-1, 2MASS J16164280+6714196, WISEA J161641.85+671420.6, Gaia DR3 1642641410934267008[16] HD 147379B: EW Draconis, HIP 79762, SAO 17026, PPM 19804, G 240-15, G 225-58, G 257-33, LHS 3176, LSPM J1616+6715, LTT 14864, NLTT 42489, TIC 230073588, TYC 4195-1167-1, GSC 04195-01167, 2MASS J16164537+6715224, WISEA J161644.44+671523.3, Gaia DR3 1642642957122493824[17] Database references SIMBAD A B

**HD 147379** (**Gliese 617**) is a wide [visual binary](/source/Visual_binary) between two [red dwarfs](/source/Red_dwarf) in the deep northern [constellation](/source/Constellation) of [Draco](/source/Draco_(constellation)). The two stars are located approximately 35.1 light-years (10.8 pc) distant based on [Gaia DR3](/source/Gaia_DR3) [parallax](/source/Stellar_parallax) measurements, and approaching the [Solar System](/source/Solar_System) at heliocentric [radial velocities](/source/Radial_velocity) of −18.962 km/s and −18.36 km/s, respectively. The brighter primary star, HD 147379A, has an [apparent magnitude](/source/Apparent_magnitude) of 8.9,[4] too faint to be seen by the [naked eye](/source/Naked_eye) from [Earth](/source/Earth) but visible using [binoculars](/source/Binoculars).[18] The dimmer secondary, B, fluctuates in apparent magnitude between 10.69 and 10.74,[6] making it observable via a [telescope](/source/Telescope) with an [aperture](/source/Aperture) of 35 mm or larger.[19]

## HD 147379A

HD 147379A (HIP 79755) is a red dwarf with a [spectral type](/source/Stellar_classification) of M0.0V, about 58% the [mass of the Sun](/source/Solar_mass), 57% the [radius](/source/Solar_radius), and an age of 5.1+3.2 −2.4 [billion years](/source/Billion_years). It emits just over a tenth of the [luminosity of the Sun](/source/Solar_luminosity) from its [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 4,090 K (3,820 °C; 6,900 °F). It has a high [metallicity](/source/Metallicity) of [Fe/H]=0.16±0.16 [dex](/source/Metallicity#Chemical_abundance_ratios), meaning it has an [iron](/source/Iron) content somewhere around 45% higher than the Sun.[11] It is also enriched in [cobalt](/source/Cobalt), but is depleted in [calcium](/source/Calcium) and [titanium](/source/Titanium). The star shows slight variations in the [TiO](/source/Titanium(II)_oxide) [spectral lines](/source/Spectral_line).[20]

### Planetary system

In 2018, two teams independently reported the discovery of an [exoplanet](/source/Exoplanet) orbiting HD 147379A, both via the [radial-velocity method](/source/Radial-velocity_method).[11][12] This was the first exoplanet found by the [CARMENES survey](/source/CARMENES_survey).[11] The planet, commonly referred to as HD 147379 b, has a [minimum mass](/source/Minimum_mass) of 21.6 ± 1.1 [M🜨](/source/Earth_mass), slightly more massive than [Neptune](/source/Neptune) (17.147 M🜨[21]). It orbits its host star once every 86.58 days at about a third of the distance from Earth to the Sun, placing it within the conservative [habitable zone](/source/Habitable_zone) of the star, where [liquid water](/source/Extraterrestrial_liquid_water#Extrasolar_habitable_zone_candidates_for_water) could exist.[4]

One of the teams that discovered HD 147379 b proposed another candidate planet, this one with a minimum mass of 27 M🜨 and a 500-day period, orbiting at a distance of about 1 AU.[12] However, a 2023 follow-up study did not detect such a signal. Instead, they detected a signal with a 12.3-day period, but discarded it due to the high chance of it being a false positive. Nevertheless, it is highly likely that a second planet exists interior to b's orbit.[4]

The HD 147379A planetary system[4] Companion (in order from star) Mass Semimajor axis (AU) Orbital period (days) Eccentricity Inclination (°) Radius b ≥21.6 ± 1.1 M🜨 0.3315 ± 0.0024[22] 86.58 ± 0.14 0.0630+0.0470 −0.0380 — —

## HD 147379B

A [red-light](/source/Photometric_system#Photometric_letters) [light curve](/source/Light_curve) plotted from [ZTF](/source/Zwicky_Transient_Facility) data[23]

HD 147379B (HIP 79762) is a [gravitationally bound](/source/Gravitational_binding_energy) companion to HD 147379A at a separation of 64.4 [arcseconds](/source/Arcsecond), which corresponds to a distance of 693.4 AU.[4]

This is a red dwarf with a spectral type of M3V, about 45% the mass of the Sun and 46% the radius. It has a "partially convective" structure, meaning that the outer [convection zone](/source/Convection_zone) does not reach down to the [core](/source/Stellar_core),[8] as opposed to "fully convective" stars weighing less than 0.35 M☉ that are convective throughout.[24] It too has a high metallicity of [M/H]=0.20±0.10 dex, translating to a roughly 60% excess in elements heavier than hydrogen and helium compared to the [Sun](/source/Sun). At an effective temperature of 3,525 K (3,252 °C; 5,885 °F),[8] it radiates just 2.6% the luminosity of the Sun from its photosphere.[15] It [rotates](/source/Stellar_rotation) on its axis once every 40.4 days at a relatively slow projected equatorial velocity of 0.50 km/s.[8]

It has a [magnetic field](/source/Stellar_magnetic_field) that fluctuated in strength between 36-75 [G](/source/Gauss_(unit)) between 2020-2022, approximately 100 times stronger than [Earth's magnetic field](/source/Earth's_magnetic_field) (0.22-0.67 G[25]) and similar to those of faster-rotating red dwarfs. The variations in strength are smaller than those seen in fully convective red dwarfs such as [Gliese 1151](/source/Gliese_1151).[8]

In 1994, the star was reported to have a high likelihood (99%) of exhibiting long-term [variability](/source/Variable_star), albeit the author noted that this may be suspect.[26] It was formally classified as a [BY Draconis variable](/source/BY_Draconis_variable) in 1997, receiving the [variable-star designation](/source/Variable-star_designation) EW Draconis.[6]

## References

1. ^ [***a***](#cite_ref-xhip_1-0) [***b***](#cite_ref-xhip_1-1) Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". *[Astronomy Letters](/source/Astronomy_Letters)*. **38** (5): 331. [arXiv](/source/ArXiv_(identifier)):[1108.4971](https://arxiv.org/abs/1108.4971). [Bibcode](/source/Bibcode_(identifier)):[2012AstL...38..331A](https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A). [doi](/source/Doi_(identifier)):[10.1134/S1063773712050015](https://doi.org/10.1134%2FS1063773712050015). [XHIP record for this object](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-ref=VIZ681510a8389ecb&-out.src=V%2F137D%2FXHIP&-nav=cat%3AV%2F137D%26tab%3A{V%2F137D%2FXHIP}%26key%3Asource%3DV%2F137D%2FXHIP%26HTTPPRM%3A&-source=V%2F137D%2FXHIP&-out=HIP&HIP=79755&-out=Comp&-out=Gr&-out=RAJ2000&-out=DEJ2000&-out=Dist&-out=X&-out=Y&-out=Z&-out=SpType&-out=Simbad&-out=Hpmag&-out=Lum&-out=Cst) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-xhipb_2-0) [***b***](#cite_ref-xhipb_2-1) Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". *[Astronomy Letters](/source/Astronomy_Letters)*. **38** (5): 331. [arXiv](/source/ArXiv_(identifier)):[1108.4971](https://arxiv.org/abs/1108.4971). [Bibcode](/source/Bibcode_(identifier)):[2012AstL...38..331A](https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A). [doi](/source/Doi_(identifier)):[10.1134/S1063773712050015](https://doi.org/10.1134%2FS1063773712050015). [XHIP record for this object](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-ref=VIZ681510a8389ecb&-out.src=V%2F137D%2FXHIP&-nav=cat%3AV%2F137D%26tab%3A{V%2F137D%2FXHIP}%26key%3Asource%3DV%2F137D%2FXHIP%26HTTPPRM%3A&-source=V%2F137D%2FXHIP&-out=HIP&HIP=79762&-out=Comp&-out=Gr&-out=RAJ2000&-out=DEJ2000&-out=Dist&-out=X&-out=Y&-out=Z&-out=SpType&-out=Simbad&-out=Hpmag&-out=Lum&-out=Cst) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-DR3_3-0) [***b***](#cite_ref-DR3_3-1) [***c***](#cite_ref-DR3_3-2) [***d***](#cite_ref-DR3_3-3) [***e***](#cite_ref-DR3_3-4) [***f***](#cite_ref-DR3_3-5) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D1642641410934267008%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

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1. ^ [***a***](#cite_ref-DR3_B_5-0) [***b***](#cite_ref-DR3_B_5-1) [***c***](#cite_ref-DR3_B_5-2) [***d***](#cite_ref-DR3_B_5-3) [***e***](#cite_ref-DR3_B_5-4) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D1642642957122493824%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

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v t e Constellation of Draco List of stars in Draco Draco in Chinese astronomy Stars Bayer α (Thuban) β (Rastaban) γ (Eltanin) δ (Altais) ε (Tyl) ζ (Aldhibah) η (Athebyne) θ ι (Edasich) κ λ (Giausar) μ (Alrakis) ν (Kuma) ξ (Grumium) ο π ρ σ (Alsafi) τ υ φ χ ψ1 (Dziban) ψ2 ω Flamsteed 4 6 7 (Tianyi) 8 (Taiyi) 10 (i) 15 (A) 18 (g) 19 (h) 26 36 39 (b) 42 (Fafnir) 45 (d) 50 59 64 (e) 68 Variable TW YY AG BY CL CM CX DO EK HP V581 HR 3751 4126 4934 5811 6237 6518 6618 (Alruba) 6817 7137 7783 HD 109246 (Funi) 101364 128717 147379 156279 158259 176693 191939 Other 2MASS 1237+6526 2MASS J17554042+6551277 G 240-72 GD 356 Gliese 420 Gliese 625 Gliese 687 GRW +70 8247 Kepler-4 Kepler-10 Kepler-12 Kepler-90 Kepler-296 KOI-256 LP 71-82 Qatar-1 SDSS J1240+6710 Struve 2398 TOI-1136 WD 1856+534 WISE 1647+5632 WISE 1841+7000 Exoplanets HD 139357 b HD 167042 b ι Dra b (Hypatia) Kepler-4b Kepler-10b c Kepler-12b Kepler-90e f g h i Kepler-296b c d e f TOI-1452 b TrES-2b Star clusters LAMOST 1 Nebulae Cat's Eye Nebula NGC 6742 Galaxies NGC 3147 3197 3735 4121 4125 4221 4236 4319 4331 4332 4363 4441 4513 4545 4589 5678 5777 5866 5866B 5879 5905 5907 5949 5963 5965 5982 5985 6090 6248 6285 6286 6338 6340 6365 6373 6394 6412 6503 6505 6566 6621 6622 6670 6676 6786 6789 Other 1ES 1927+654 1ES 1959+650 3C 249.1 3C 305 3C 319 3C 343 3C 343.1 3C 351 3C 356 3C 371 3C 380 3C 390.3 3C 401 4C +72.26 4C 73.08 8C 1241+735 Abell 2218 BCG Bean galaxy Beaver galaxy BZQ J1727+5510 Draco Dwarf Draco II GB 1508+5714 Goldfish galaxy H1821+643 HFLS3 IERS B1946+708 IRAS F17179+5444 IRAS 18580+6527 J120011.1+680924.8 KKR 25 Markarian 817 Markarian 876 Original TRG PGC 39058 Porphyrion QSO B1823+568 RGZ J172749.5+534647 S5 1803+784 S5 2007+777 SDSS J1715+6008 Tadpole Galaxy UGC 9391 UGC 9405 UGC 11241 UGC 11411 WISEA J145223.62+611707.5 WN B1851+5707 Galaxy clusters Abell 2218 CL1358+62 Draco Supercluster NGC 5866 Group Astronomical events SN 2003jb SN 2005B SN 2016aps Swift J1644+57 Category

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Adapted from the Wikipedia article [HD 147379](https://en.wikipedia.org/wiki/HD_147379) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/HD_147379?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.