45 Andromedae
Double star in the constellation Andromeda
From Wikipedia, the free encyclopedia
45 Andromedae, abbreviated 45 And, is a double star[10] in the northern constellation Andromeda. 45 Andromedae is the Flamsteed designation. Its combined apparent visual magnitude is 5.80.[1] Based upon an annual parallax shift of 4.95 mas,[2] it is located 659 light years away.
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda[1] |
| Right ascension | 01h 11m 10.2771s[2] |
| Declination | +37° 43′ 26.848″[2] |
| Apparent magnitude (V) | 5.80[1] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | B7 III-IV[3] |
| B−V color index | −0.095±0.004[1] |
| Astrometry | |
| Radial velocity (Rv) | −1.5±1.0[4] km/s |
| Proper motion (μ) | RA: −15.844[2] mas/yr Dec.: −5.486[2] mas/yr |
| Parallax (π) | 4.9479±0.0555 mas[2] |
| Distance | 659 ± 7 ly (202 ± 2 pc) |
| Absolute magnitude (MV) | −1.10[1] |
| Details | |
| Mass | 3.30[5] M☉ |
| Radius | 4.24[6] R☉ |
| Luminosity | 156[5] L☉ |
| Surface gravity (log g) | 3.93[7] cgs |
| Temperature | 12,078[5] K |
| Metallicity [Fe/H] | −0.47[7] dex |
| Rotational velocity (v sin i) | 60[8] km/s |
| Other designations | |
| 45 And, BD+36°201, HD 7019, HIP 5550, HR 348, SAO 54494, PPM 66038, WDS J01112+3743AB[9] | |
| Database references | |
| SIMBAD | data |
The stellar classification of 45 And is B7 III-IV,[3] matching an evolving subgiant/giant star. It has about 4.2 times the Sun's radius[6] and is radiating 156 times the Sun's luminosity from its photosphere at an effective temperature of 12,078 K.[5]
This star is most likely single. A companion star was discovered by American astronomer George W. Hough in 1890. As of 2006, the companion was at an angular separation of 0.10″ along a position angle of 225° from the primary.[10]