Epsilon Piscis Austrini
Epsilon Piscis Austrini, also known as ε Piscis Austrini, is a blue-white star in the constellation of Piscis Austrinus. It can be seen with the naked eye and has an apparent visual magnitude of +4.17.[1] The system is located about 400 light years from the Sun and has an annual parallax shift of 8.0981 ± 0.3582 mas as seen from the GAIA satellite.[2]
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Piscis Austrinus |
| Right ascension | 22h 40m 39.34075s[3] |
| Declination | −27° 02′ 37.0157″[3] |
| Apparent magnitude (V) | +4.17[1] |
| Characteristics | |
| Spectral type | B8 Ve[4] or B8 IVe[5] |
| U−B color index | −0.31[1] |
| B−V color index | −0.11[1] |
| Astrometry | |
| Radial velocity (Rv) | +1.1±2.8 km/s |
| Proper motion (μ) | RA: +23.22[3] mas/yr Dec.: −0.16[3] mas/yr |
| Parallax (π) | 8.0981 ± 0.3582[2] mas |
| Distance | 400 ± 20 ly (123 ± 5 pc) |
| Absolute magnitude (MV) | −1.66[5] |
| Details | |
| Mass | 4.10±0.19[6] M☉ |
| Radius | 3.2[7] R☉ |
| Luminosity | 661[6] L☉ |
| Surface gravity (log g) | 3.93[8] cgs |
| Temperature | 11,066[6] K |
| Rotational velocity (v sin i) | 216[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
References
- ↑ 1.0 1.1 1.2 1.3 Feinstein, A.. The photometric behavior of Be Stars. Astronomical Journal 84 (November 1979). p. 1713–1725. doi:10.1086/112600.
- ↑ 2.0 2.1 Template:Cite DR2
- ↑ 3.0 3.1 3.2 3.3 van Leeuwen, F.. Validation of the new Hipparcos reduction. Astronomy and Astrophysics 474 (2) (2007). p. 653–664. doi:10.1051/0004-6361:20078357.
- ↑ Abt, Helmut A.. Rotational Velocities of B Stars. The Astrophysical Journal 573 (1) (July 2002). p. 359–365. doi:10.1086/340590.
- ↑ 5.0 5.1 Anderson, E.. XHIP: An extended hipparcos compilation. Astronomy Letters 38 (5) (2012). p. 331. doi:10.1134/S1063773712050015.
- ↑ 6.0 6.1 6.2 6.3 Zorec, J.. Rotational velocities of A-type stars. IV. Evolution of rotational velocities. Astronomy & Astrophysics 537 (2012). p. A120. doi:10.1051/0004-6361/201117691.
- ↑ Pasinetti Fracassini, L. E.. Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS). Astronomy and Astrophysics 367 (February 2001). p. 521–524. doi:10.1051/0004-6361:20000451.
- ↑ Chauville, J.. High and intermediate-resolution spectroscopy of Be stars 4481 lines. Astronomy and Astrophysics 378 (November 2001). p. 8618–82. doi:10.1051/0004-6361:20011202.
- ↑ eps PsA -- Be Star. SIMBAD Astronomical DatabaseCentre de Données astronomiques de Strasbourg. Retrieved 2017-05-18.
