HD 146389
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 16h 15m 50.36533s |
| Declination | +10° 01′ 57.2843″ |
| Apparent magnitude (V) | 9.447±0.024 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | F8 |
| B−V color index | 0.476 |
| J−H color index | 0.181 |
| J−K color index | 0.289 |
| Astrometry | |
| Radial velocity (Rv) | −9.24±0.23 km/s |
| Proper motion (μ) | RA: −31.135 mas/yr Dec.: −39.167 mas/yr |
| Parallax (π) | 7.3373±0.0181 mas |
| Distance | 445 ± 1 ly (136.3 ± 0.3 pc) |
| Details | |
| Mass | 1.203±0.036 M☉ |
| Radius | 1.331+0.030 −0.025 R☉ |
| Luminosity | 2.838±0.024 L☉ |
| Surface gravity (log g) | 4.25+0.012 −0.013 cgs |
| Temperature | 6,150±80 K |
| Metallicity [Fe/H] | 0.06 dex |
| Rotational velocity (v sin i) | 8.6±0.4 km/s |
| Age | 350 Myr 400±500 Myr |
| Other designations | |
| Irena, BD+10°2980, HD 146389, SAO 102042, WASP-38, 2MASS J16155036+1001572 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 146389, also known as WASP-38 and named Irena, is a star with a yellow-white hue in the northern constellation of Hercules. It is invisible to the naked eye with an apparent visual magnitude of 9.4 The star is located at a distance of approximately 445 light-years from the Sun based on parallax, but is drifting closer with a radial velocity of −9 km/s. The star is known to host one exoplanet, designated WASP-38b or formally named Iztok.