HD 117566
High proper motion star; Camelopardalis
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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]
 | |
| 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 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]