  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Camelopardalis [1] |
| Right ascension | 13h 26m 56.80348s [2] |
| Declination | +78° 38′ 37.9324″ [2] |
| Apparent magnitude (V) | 5.74±0.01 [3] |
| Characteristics | |
| Evolutionary stage | Hertzsprung gap [4] [2] |
| Spectral type | G3 IIIb Fe−1 CH1 [5] |
| U−B color index | +0.35 [6] |
| B−V color index | +0.77 [6] |
| Astrometry | |
| Radial velocity (Rv) | 13.7±0.3 [7] km/s |
| Proper motion (μ) | RA: −140.497 mas/yr [2] Dec.: +30.403 mas/yr [2] |
| Parallax (π) | 11.1974±0.0417 mas [2] |
| Distance | 291 ± 1 ly (89.3 ± 0.3 pc) |
| Absolute magnitude (MV) | +1.03 [1] |
| Details | |
| Mass | 2.29 [8] M☉ |
| Radius | 7.2±0.4 [9] R☉ |
| Luminosity | 38.2±0.3 [2] L☉ |
| Surface gravity (log g) | 3.69±0.18 [10] cgs |
| Temperature | 5,420±26 [11] K |
| Metallicity [Fe/H] | +0.03 [10] dex |
| Rotational velocity (v sin i) | 8.9±1 [12] km/s |
| Age | 760±50 [7] Myr |
| Other designations | |
| AG+78°340, BD+79°422, FK5 3075, GC 18223, HD 117566, HIP 65595, HR 5091, SAO 7821 [13] | |
| Database references | |
| SIMBAD | data |
HD 117566, also known as HR 5091, is a solitary yellow-hued star [14] located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.74, [3] making it faintly visible to the naked eye. This object is relatively close at a distance of 291 light years based on Gaia DR3 parallax measurements but is receding with a heliocentric radial velocity of 14 km/s . [7] At its current distance, HD 117566's brightness is diminished by 0.12 magnitudes due to interstellar dust. [15]
HD 117566 has a stellar classification of G3 IIIb Fe−1 CH1, [5] indicating that it is a G-type giant with an under-abundance of iron and an overabundance of the CH radical in its spectrum. Its evolutionary stage is unclear. A 1994 paper places it in the Hertzsprung gap, [4] indicating it has ceased hydrogen core fusion and is now evolving toward the red giant branch (RGB), and Gaia Data Release 3 models agree that it is a subgiant. [2] It has 2.29 times the mass of the Sun [8] and, at the age of 760 million years, [7] it has expanded to 7.2 times the Sun's radius. [9] It radiates 38.2 times the luminosity of the Sun [2] from its photosphere at an effective temperature of 5,420 K . [11] HD 117566 has a solar metallicity [10] and spins modestly with a projected rotational velocity of 9 km/s . [12]
