Phi Andromedae
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Andromeda |
| Right ascension | 01h 09m 30.13s [1] |
| Declination | +47° 14′ 30.5″ [1] |
| Apparent magnitude (V) | 4.252 |
| Characteristics | |
| Spectral type | B7V |
| U-B color index | -0.34 |
| B-V color index | -0.07 |
| R-I color index | -0.05 |
| Variable type | Emission-line Star |
| Astrometry | |
| Radial velocity (Rv) | -0.1 km/s |
| Proper motion (μ) | RA: 4.05 ± 0.52 [1] mas/yr Dec.: -12.43 ± 0.38 [1] mas/yr |
| Parallax (π) | 4.55 ± 0.60[1] mas |
| Distance | approx. 720 ly (approx. 220 pc) |
| Absolute magnitude (MV) | 4.197 |
| Details | |
| Mass | 18 M☉ |
| Radius | 7 R☉ |
| Luminosity | 20.000 L☉ |
| Temperature | 10.000–30.000 K |
| Rotation | 71 Km/s 0,013684245239 Year |
| Orbit | |
| Companion | φ Andromedae B |
| Period (P) | 371.6 yr |
| Semimajor axis (a) | 0.447" |
| Eccentricity (e) | 0.21 |
| Inclination (i) | 131° |
| Longitude of the node (Ω) | 148.2° |
| Periastron epoch (T) | 1889.9 |
| Orbit | |
| Companion | φ Andromedae C |
| Semimajor axis (a) | 10" |
| Inclination (i) | 224° |
| Orbit | |
| Companion | φ Andromedae D |
| Semimajor axis (a) | 27.7" |
| Inclination (i) | 64° |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
Phi Andromedae (φ Andromedae / φ And) is a binary star system near the border of the constellation of Andromeda, approximately 720 light years from the Earth.[1] It with χ And composed Chinese asterism 軍南門 (Keun Nan Mun, Mandarin jūnnánmén), "the South Gate of the Camp".[2]
Contents |
[edit] Double star
The primary component, φ And A, is a blue-white B-type subgiant with an apparent magnitude of 4.6m. The companion star, φ And B, is a blue-white B-type main sequence dwarf with an apparent magnitude of 5.6m. The two stars are separated by 0.64 arcseconds and have an orbital period of 371.6 years. The combined brightness of the system is 4.26m.
[edit] Components
| NAME | Right ascension | Declination | Apparent magnitude (V) | Spectral type | Database references |
|---|---|---|---|---|---|
| φ Andromedae C (BD+46 275A) | 01h 09m 30s | +47° 15' | B6IV | Simbad | |
| φ Andromedae D (BD+46 275B) | 01h 09m 30s | +47° 15' | B9V | Simbad |
[edit] Location
This star's location in the constellation Andromeda can be seen in the following diagram:
[edit] References
- ^ a b c d e f van Leeuwen, F. (2007). "HIP 5434". Hipparcos, the New Reduction. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=5423. Retrieved 2009-12-06.
- ^ Allen, R. H. (1899). Star-names and Their Meanings. New York: G. E. Stechart. p.39.
[edit] External links
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