Tau Andromedae
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| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
Andromeda |
| Right ascension | 01h 40m 34.817s |
| Declination | +40° 34′ 37.377″ |
| Apparent magnitude (V) | 4.96 |
| Characteristics | |
| Spectral type | B8III |
| U-B color index | -0.41 |
| B-V color index | -0.09 |
| Variable type | Variable Star |
| Astrometry | |
| Radial velocity (Rv) | -14 km/s |
| Proper motion (μ) | RA: 16.67 mas/yr Dec.: -23.50 mas/yr |
| Parallax (π) | 4.79 ± 0.74 mas |
| Distance | approx. 700 ly (approx. 210 pc) |
| Absolute magnitude (MV) | 4.869 |
| Details | |
| Age | ? years |
| Visual binary orbit | |
| Companion | Tau Andromedae B |
| Semimajor axis (a) | 48.9" |
| Inclination (i) | 329° |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
Tau Andromedae (τ And / τ Andromedae) is a binary star in the constellation Andromeda. It is approximately 681 light years from Earth.
The primary component, τ Andromedae A, is a blue-white B-type giant with an apparent magnitude of +4.96. The companion, τ Andromedae B, is a 12th magnitude star, 52.3 arcseconds distant.
[edit] Components
| NAME | Right ascension | Declination | Apparent magnitude (V) | Database references |
|---|---|---|---|---|
| τ Andromedae B (BD+39 378B) | 01h 40m 32.1s | +40° 35' 22 | 11.52 | Simbad |
[edit] Reference
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