49 Andromedae (abbreviated 49 And) is a star in the constellation Andromeda. 49 Andromedae is the Flamsteed designation though it also bears the Bayer designation A Andromedae. It is visible to the naked eye under good viewing conditions with an apparent visual magnitude of 5.269.[2] The distance to 49 Andromedae, as determined from its annual parallax shiftof10.4 mas,[1] is around 314 light-years. It is moving closer to the Sun with a heliocentric radial velocity of −11.5 km/s.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 01h30m 06.10154s[1] |
| Declination | +47° 00′ 26.1860″[1] |
| Apparent magnitude (V) | 5.269[2] |
| Characteristics | |
| Spectral type | K0 III[3] |
| B−V color index | 0.993[2] |
| Astrometry | |
| Radial velocity (Rv) | −11.48[2] km/s |
| Proper motion (μ) | RA: −0.939[1] mas/yr Dec.: −42.969[1] mas/yr |
| Parallax (π) | 10.3989 ± 0.1605 mas[1] |
| Distance | 314 ± 5 ly (96 ± 1 pc) |
| Absolute magnitude (MV) | 0.50[4] |
| Details | |
| Mass | 2.07[2] M☉ |
| Radius | 11[5] R☉ |
| Luminosity | 70.8[2] L☉ |
| Surface gravity (log g) | 2.30[6] cgs |
| Temperature | 4,879±106[2] K |
| Metallicity [Fe/H] | +0.020±0.04[6] dex |
| Rotational velocity (v sin i) | 2.0[7] km/s |
| Age | 1.75[2] Gyr |
| Other designations | |
A And[8], 49 And, BD+46° 370, HD 9057, HIP 6999, HR 430, SAO 37275, PPM 44057, GSC 03282-02272[9] | |
| Database references | |
| SIMBAD | data |
With an estimated age of 1.75 Gyr[2] years, this is an aging red-clump[6] giant star with a stellar classification of K0 III,[3] indicating it is generating energy by helium fusion at its core. The spectrum displays "slightly strong" absorption linesofcyanogen (CN).[3] It has 2.07[2] times the mass of the Sun and has expanded to 11[5] times the Sun's radius. The star is radiating 71[2] times the Sun's luminosity from its enlarged photosphere at an effective temperatureof4,879 K.[2]