HD 208741
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Octans |
| A | |
| Right ascension | 22h 03m 03.8227s |
| Declination | −76° 07′ 06.453″ |
| Apparent magnitude (V) | 5.93±0.01 |
| B | |
| Right ascension | 22h 03m 12.9150s |
| Declination | −76° 06′ 54.860″ |
| Apparent magnitude (V) | 10.57 |
| Characteristics | |
| A | |
| Evolutionary stage | main sequence |
| Spectral type | F3 III |
| U−B color index | +0.11 |
| B−V color index | +0.39 |
| B | |
| Spectral type | K5 |
| B−V color index | +0.7 |
| Astrometry | |
| Radial velocity (Rv) | 8±1.1 km/s |
| Absolute magnitude (MV) | +1.96 |
| A | |
| Proper motion (μ) | RA: +24.821 mas/yr Dec.: −72.437 mas/yr |
| Parallax (π) | 15.4736±0.0383 mas |
| Distance | 210.8 ± 0.5 ly (64.6 ± 0.2 pc) |
| B | |
| Proper motion (μ) | RA: +29.912 mas/yr Dec.: −71.414 mas/yr |
| Parallax (π) | 15.5058 ± 0.0249 mas |
| Distance | 210.3 ± 0.3 ly (64.5 ± 0.1 pc) |
| Details | |
| A | |
| Mass | 1.52±0.25 M☉ |
| Radius | 2.6±0.1 R☉ |
| Luminosity | 12.9 L☉ |
| Surface gravity (log g) | 3.89 cgs |
| Temperature | 6,937±80 K |
| Metallicity [Fe/H] | +0.33 dex |
| Rotational velocity (v sin i) | 36 km/s |
| Age | 1.1±0.1 Gyr |
| Other designations | |
| 66 G. Octantis, CD−76°1113, CPD−76°1542, FK5 3760, GC 30788, HD 208741, HIP 108849, HR 8380, SAO 257993, WDS J22031-7607A | |
| Database references | |
| SIMBAD | A |
| B | |
HD 208741, also known as HR 8380, is a yellowish-white hued star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.91, making it faintly visible to the naked eye. Parallax measurements place it at a distance of 211 light years, and it is currently receding with a heliocentric radial velocity of 8 km/s.
HD 208741 has a 10th magnitude K-type main-sequence companion separated by 34.8″. Together, they make up a wide binary system designated collectively as CPD−76°1542. Sir John Herschel, the discoverer of the pair, noted the primary to be a probable spectroscopic binary.
This object has a stellar classification of F3 III, indicating that it is a slightly evolved F-type star. Gaia Data Release 3 models it to be a dwarf that is 81.3% through its main sequence lifetime. At present it has 1.52 times the mass of the Sun and a slightly enlarged radius of 2.6 R☉ due to its evolved state. It radiates at 12.9 times the luminosity of the Sun from its photosphere at an effective temperature of 6,937 K. HD 208741 has a metallicity twice the Sun's, making it metal enriched. It is estimated to be 1.1 billion years old, and is spinning with a projected rotational velocity of 36 km/s.