55 Andromedae
Star in the constellation Andromeda
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55 Andromedae, abbreviated 55 And, is a single,[9] orange-hued star in the northern constellation of Andromeda. 55 Andromedae is the Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 5.42.[1] Based upon an annual parallax shift of 4.5 mas,[2] it is located about 730 light years from the Sun. 55 And is moving closer to the Earth with a heliocentric radial velocity of −7.6 km/s.[5] It is a member of the Sirius supercluster.[10]
 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Andromeda[1] |
| Right ascension | 01h 53m 17.34433s[2] |
| Declination | +40° 43′ 47.2455″[2] |
| Apparent magnitude (V) | 5.42[1] |
| Characteristics | |
| Evolutionary stage | red giant branch[2] |
| Spectral type | K1 III[3] |
| U−B color index | +1.41[4] |
| B−V color index | +1.32[4] |
| Astrometry | |
| Radial velocity (Rv) | −7.59±0.2[5] km/s |
| Proper motion (μ) | RA: −10.028[2] mas/yr Dec.: −3.966[2] mas/yr |
| Parallax (π) | 4.4983±0.0761 mas[2] |
| Distance | 730 ± 10 ly (222 ± 4 pc) |
| Absolute magnitude (MV) | −1.00[1] |
| Details | |
| Mass | 5.0[2] M☉ |
| Radius | 37[6] R☉ |
| Luminosity | 492[6] L☉ |
| Surface gravity (log g) | 1.58[7] cgs |
| Temperature | 4,348[7] K |
| Metallicity [Fe/H] | −0.14[3] dex |
| Age | 323[7] Myr |
| Other designations | |
| 55 And, BD+40°394, FK5 2124, HD 11428, HIP 8814, HR 543, SAO 37587, PPM 44535, WDS J01533+4044A[8] | |
| Database references | |
| SIMBAD | data |
This is an aging giant star with a stellar classification of K1 III,[3] which indicates it has exhausted the hydrogen supply at its core and evolved away from the main sequence. It is radiating 492 times the Sun's luminosity[6] from its enlarged photosphere at an effective temperature of 4,348 K.[7] It has a magnitude 10.90 visual companion at an angular separation of 59.00″ along a position angle of 357° from 55 And. In 1828, this separation was just 20.0″.[11]