| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Mensa |
| Right ascension | 03h36m 30.1435s[1] |
| Declination | −78° 19′ 23.0623″[1] |
| Apparent magnitude (V) | 6.30±0.01[2] |
| Characteristics | |
| Spectral type | K2 III[3] |
| U−B color index | +1.03[4] |
| B−V color index | +1.15[4] |
| Astrometry | |
| Radial velocity (Rv) | 2.4±0.4[5] km/s |
| Proper motion (μ) | RA: −14.12 mas/yr[1] Dec.: +6.67 mas/yr[1] |
| Parallax (π) | 4.34 ± 0.36 mas[1] |
| Distance | 750 ± 60 ly (230 ± 20 pc) |
| Absolute magnitude (MV) | −0.50[6] |
| Details | |
| Mass | 1.21[7] M☉ |
| Radius | 33.51±7.44[8] R☉ |
| Luminosity | 227[9] L☉ |
| Surface gravity (log g) | 1.22[8] cgs |
| Temperature | 4,556[9] K |
| Metallicity [Fe/H] | −0.03[7] dex |
| Rotational velocity (v sin i) | 1.2±1.3[10] 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[11][12] | |
| Database references | |
| SIMBAD | data |
HD 23474 (HR 1154) is a double star[13] 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 velocityof2.4 km/s.
As of 2018, the pair have a separationof0.2 arcseconds along a position angleof92°.[13]
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☉[8] and has an effective temperatureof4,556 K,[9] giving an orange hue. It has 121% the mass of the Sun and shines with a luminosityof227 L☉[9] from its enlarged photosphere. HD 23474 spins with a poorly constrained projected rotational velocityof1.2 km/s[10] and has a metallicity around solar level.[7]
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