11 Andromedae
Star in the constellation Andromeda
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11 Andromedae, abbreviated 11 And, is a single,[10] orange-hued star in the northern constellation of Andromeda. 11 Andromedae is the Flamsteed designation. It has an apparent visual magnitude of 5.44,[2] which is bright enough to be faintly visible to the naked eye. An annual parallax shift of 11.5 mas[1] yields a distance estimate of 283 light years. It is moving further from the Earth with a heliocentric radial velocity of +10 km/s.[1]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 23h 19m 29.80701s[1] |
| Declination | +48° 37â² 31.1615â³[1] |
| Apparent magnitude (V) | 5.44[2] |
| Characteristics | |
| Spectral type | K0 III[3] |
| UâB color index | +0.82[4] |
| BâV color index | +1.014±0.003[2] |
| Astrometry | |
| Radial velocity (Rv) | +9.99±0.14[1] km/s |
| Proper motion (μ) | RA: +22.597[1] mas/yr Dec.: +52.689[1] mas/yr |
| Parallax (Ï) | 11.5097±0.0858 mas[1] |
| Distance | 283 ± 2 ly (86.9 ± 0.6 pc) |
| Absolute magnitude (MV) | 0.73[2] |
| Details | |
| Mass | 2.57[5] Mâ |
| Radius | 12[6] Râ |
| Luminosity | 62.86[2] Lâ |
| Surface gravity (log g) | 2.61[5] cgs |
| Temperature | 4,874[5] K |
| Metallicity [Fe/H] | â0.13±0.07[7] dex |
| Rotational velocity (v sin i) | 1.0[8] km/s |
| Other designations | |
| 11 And, BD+47°4110, GC 32476, HD 219945, HIP 115152, HR 8874, SAO 52907, PPM 64074[9] | |
| Database references | |
| SIMBAD | data |
This is an evolved giant star with a stellar classification of K0 III,[3] which means it has exhausted the supply of hydrogen at its core and turned off the main sequence. It has an estimated 2.57[5] times the mass of the Sun and has expanded to around 12[6] times the Sun's radius. It is radiating 63[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,874 km/s.[5]
Within Andromeda it is the south-west end of a bright northerly chain (jagged line) asterism â the others being, their order going with numbering, 8, 7, 5 and 3 Andromedae.