Pi Andromedae
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| Observation data Epoch J2000 |
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| Constellation (pronunciation) |
Andromeda |
| Right ascension | 00h 36m 52.8497s |
| Declination | +33° 43' 09.637"' |
| Apparent magnitude (V) | 4.335 |
| Characteristics | |
| Spectral type | B5V |
| U-B color index | -0.55 |
| B-V color index | -0.14 |
| Variable type | None |
| Astrometry | |
| Radial velocity (Rv) | 8.7 km/s |
| Proper motion (μ) | RA: 15.23 mas/yr Dec.: -3.56 mas/yr |
| Parallax (π) | 4.97 ± 0.82 mas |
| Distance | approx. 700 ly (approx. 200 pc) |
| Absolute magnitude (MV) | 4.223 |
| Details | |
| Mass | 18 M☉ |
| Radius | 7 R☉ |
| Surface gravity (log g) | ? |
| Luminosity | 20.000 L☉ |
| Temperature | 10.000–30.000 K |
| Metallicity | ? |
| Rotation | 0,393173169 year |
| Age | ? years |
| Visual binary orbit | |
| Companion | π Andromedae B |
| Period (P) | 103 yr |
| Semimajor axis (a) | 35.9" |
| Inclination (i) | 173° |
| Visual binary orbit | |
| Companion | π Andromedae C |
| Semimajor axis (a) | 55.2" |
| Inclination (i) | 357° |
| Visual binary orbit | |
| Companion | π Andromedae D |
| Semimajor axis (a) | 0" |
| Inclination (i) | 0° |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
Pi Andromedae (π And / π Andromedae) is a star system in the constellation Andromeda. It is approximately 660 light years from Earth.
The primary component, Pi Andromedae A, is a blue-white B-type main sequence dwarf with an apparent magnitude of +4.34. It is a spectroscopic binary with an orbital period of 143.6065 days. The binary has a 9th magnitude companion, Pi Andromedae B, 35.9 arcseconds away. It is a white A-type main sequence dwarf and has an orbital period of about 103 thousand years. At 55 arcseconds separation is the 11th magnitude Pi Andromedae C, which appears to be an optical companion.
[edit] Location
This star's location in the constellation Andromeda can be seen in the following diagram:
[edit] Components
| NAME | Right ascension | Declination | Apparent magnitude (V) | Spectral type | Database references |
|---|---|---|---|---|---|
| π Andromedae B (ADS 513 AB) | 00h 36m 54s | +33° 43' | 4.3 | B5 | Simbad |
| π Andromedae C (BD+32 102) | 00h 36m 42.2s | +33° 42' 33.79 | 8.61 | A6V | Simbad |
| π Andromedae D (BD+32 101C) | 00h 36m 52.5s | +33° 44' 0.4 | 13.01 | F3 | Simbad |
[edit] Reference
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