HD 23474
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Mensa |
| Right ascension | 03h 36m 30.1435s |
| Declination | −78° 19′ 23.0623″ |
| Apparent magnitude (V) | 6.30±0.01 |
| Characteristics | |
| Spectral type | K2 III |
| U−B color index | +1.03 |
| B−V color index | +1.15 |
| Astrometry | |
| Radial velocity (Rv) | 2.4±0.4 km/s |
| Proper motion (μ) | RA: −14.12 mas/yr Dec.: +6.67 mas/yr |
| Parallax (π) | 4.34±0.36 mas |
| Distance | 750 ± 60 ly (230 ± 20 pc) |
| Absolute magnitude (MV) | −0.50 |
| Details | |
| Mass | 1.21 M☉ |
| Radius | 33.51±7.44 R☉ |
| Luminosity | 227 L☉ |
| Surface gravity (log g) | 1.22 cgs |
| Temperature | 4,556 K |
| Metallicity [Fe/H] | −0.03 dex |
| Rotational velocity (v sin i) | 1.2±1.3 km/s |
| Other designations | |
| 3 G. Mensae, CPD−78°105, FK5 2261, GC 4400, HD 23474, HIP 16827, HR 1154, SAO 256005, WDS J03365-7819AB | |
| Database references | |
| SIMBAD | data |
HD 23474 (HR 1154) is a double star in the southern circumpolar constellation Mensa. It has an apparent magnitude of 6.30, placing it near the max naked eye visibility. The system is situated at a distance of about 750 light years and is currently receding with a heliocentric radial velocity of 2.4 km/s.
As of 2018, the pair have a separation of 0.2 arcseconds along a position angle of 92°.
The primary or visible component has a stellar classification of K2 III, indicating that it is a red giant. As a result, it has expanded to a diameter of 33.51 R☉ and has an effective temperature of 4,556 K, giving an orange hue. It has 121% the mass of the Sun and shines with a luminosity of 227 L☉ from its enlarged photosphere. HD 23474 spins with a poorly constrained projected rotational velocity of 1.2 km/s and has a metallicity around solar level.