45 Andromedae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 01h 02m 54.25356s |
| Declination | +41° 20′ 42.7673″ |
| Apparent magnitude (V) | 5.80 |
| Characteristics | |
| Spectral type | B7 III-IV |
| B−V color index | −0.095±0.004 |
| Astrometry | |
| Radial velocity (Rv) | −1.5±1.0 km/s |
| Proper motion (μ) | RA: −17.558 mas/yr Dec.: −18.400 mas/yr |
| Parallax (π) | 9.5725±0.0805 mas |
| Distance | 341 ± 3 ly (104.5 ± 0.9 pc) |
| Absolute magnitude (MV) | −1.10 |
| Details | |
| Radius | 5.2 R☉ |
| Luminosity | 413.92 L☉ |
| Temperature | 12,874±167 K |
| Rotational velocity (v sin i) | 60 km/s |
| Other designations | |
| 45 And, BD+36°201, HD 7019, HIP 5550, HR 348, SAO 54494, PPM 66038, WDS J01112+3743AB | |
| Database references | |
| SIMBAD | data |
45 Andromedae, abbreviated 45 And, is a double star in the northern constellation Andromeda. 45 Andromedae is the Flamsteed designation. Its combined apparent visual magnitude is 5.80. Based upon an annual parallax shift of 9.57 mas, it is located 341 light years away.
The stellar classification of 45 And is B7 III-IV, matching an evolving subgiant/giant star. It has about 5.2 times the Sun's radius and is radiating 414 times the Sun's luminosity from its photosphere at an effective temperature of 12,874 K.
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.