HD 147379
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco |
| HD 147379A | |
| Right ascension | 16h 16m 42.74635s |
| Declination | +67° 14′ 19.8316″ |
| Apparent magnitude (V) | 8.9 |
| HD 147379B | |
| Right ascension | 16h 16m 45.31448s |
| Declination | +67° 15′ 22.4811″ |
| Apparent magnitude (V) | 10.69-10.74 |
| Characteristics | |
| HD 147379A | |
| Evolutionary stage | main sequence |
| Spectral type | M0.0V |
| B−V color index | 1.11 |
| J−H color index | 0.643 |
| J−K color index | 0.826 |
| HD 147379B | |
| Spectral type | M3V |
| J−H color index | 0.608 |
| J−K color index | 0.842 |
| Variable type | BY Draconis variable |
| Astrometry | |
| HD 147379A | |
| Radial velocity (Rv) | −18.962±0.0011 km/s |
| Proper motion (μ) | RA: −497.915 mas/yr Dec.: 84.047 mas/yr |
| Parallax (π) | 92.8766±0.0146 mas |
| Distance | 35.117 ± 0.006 ly (10.767 ± 0.002 pc) |
| Absolute magnitude (MV) | +8.47 |
| HD 147379B | |
| Radial velocity (Rv) | −18.36±0.0008 km/s |
| Proper motion (μ) | RA: −483.006 mas/yr Dec.: 89.049 mas/yr |
| Parallax (π) | 92.8985±0.0160 mas |
| Distance | 35.109 ± 0.006 ly (10.764 ± 0.002 pc) |
| Absolute magnitude (MV) | +10.54 |
| Orbit | |
| Primary | HD 147379A |
| Name | HD 147379B |
| Semi-major axis (a) | 64.4" (693.4 AU) |
| Details | |
| HD 147379A | |
| Mass | 0.58±0.08 M☉ |
| Radius | 0.57±0.06 R☉ |
| Luminosity | 0.1069±0.0153 L☉ |
| Surface gravity (log g) | 4.609±0.012 cgs |
| Temperature | 4090±50 K |
| Metallicity [Fe/H] | 0.16±0.16 dex |
| Rotation | 22 d |
| Age | 5.1+3.2 −2.4 Gyr |
| HD 147379B | |
| Mass | 0.45±0.02 M☉ |
| Radius | 0.460±0.008 R☉ |
| Luminosity | 0.02645±0.00645 L☉ |
| Surface gravity (log g) | 4.84±0.06 cgs |
| Temperature | 3525±31 K |
| Metallicity [Fe/H] | 0.20±0.10 dex |
| Rotation | 40.4±3.0 d |
| Rotational velocity (v sin i) | 0.50 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 | |
| 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 | |
| Database references | |
| SIMBAD | A |
| B | |
HD 147379 (Gliese 617) is a wide visual binary between two red dwarfs in the deep northern constellation of Draco. The two stars are located approximately 35.1 light-years (10.8 pc) distant based on Gaia DR3 parallax measurements, and approaching the Solar System at heliocentric radial velocities of −18.962 km/s and −18.36 km/s, respectively. The brighter primary star, HD 147379A, has an apparent magnitude of 8.9, too faint to be seen by the naked eye from Earth but visible using binoculars. The dimmer secondary, B, fluctuates in apparent magnitude between 10.69 and 10.74, making it observable via a telescope with an aperture of 35 mm or larger.