HD 17156
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 02h 49m 44.48710s |
| Declination | +71° 45′ 11.6292″ |
| Apparent magnitude (V) | 8.16 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | F9V |
| Astrometry | |
| Radial velocity (Rv) | −3.29±0.13 km/s |
| Proper motion (μ) | RA: +90.848 mas/yr Dec.: −33.013 mas/yr |
| Parallax (π) | 12.9142±0.0177 mas |
| Distance | 252.6 ± 0.3 ly (77.4 ± 0.1 pc) |
| Absolute magnitude (MV) | 3.80 |
| Details | |
| Mass | 1.275±0.018 M☉ |
| Radius | 1.5007±0.0076 R☉ |
| Luminosity | 2.76+0.19 −0.13 L☉ |
| Surface gravity (log g) | 4.184±0.024 cgs |
| Temperature | 6,046+76 −72 K |
| Metallicity [Fe/H] | +0.208±0.058 dex |
| Rotation | ~12.8 d |
| Rotational velocity (v sin i) | 2.8±0.5 km/s |
| Age | 3.37+0.20 −0.47 Gyr |
| Other designations | |
| Nushagak, AG+71 95, BD+71 171, HD 17156, HIP 13192, SAO 4737, PPM 5099, TOI-1573, TIC 302773669, TYC 4321-1320-1, GSC 04321-01320 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 17156, named Nushagak by the IAU, is a yellow subgiant star approximately 253 light-years away in the constellation of Cassiopeia. The apparent magnitude is 8.16, which means it is not visible to the naked eye but can be seen with good binoculars. It hosts one known exoplanet, HD 17156 b. A search for a binary companion star using adaptive optics at the MMT Observatory was negative.