Pi Piscis Austrini
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Piscis Austrinus |
Right ascension | 23h 03m 29.81356s[1] |
Declination | −34° 44′ 57.8814″[1] |
Apparent magnitude (V) | 5.135[2] |
Characteristics | |
Spectral type | F1 V Fe-0.8[3] |
U−B color index | +0.00[4] |
B−V color index | +0.29[4] |
Astrometry | |
Radial velocity (Rv) | -6.00[2] km/s |
Proper motion (μ) | RA: 71.46[1] mas/yr Dec.: 84.55[1] mas/yr |
Parallax (π) | 33.99 ± 0.73[1] mas |
Distance | 96 ± 2 ly (29.4 ± 0.6 pc) |
Absolute magnitude (MV) | +2.78[3] |
Orbit[5] | |
Primary | π PsA A |
Companion | π PsA B |
Period (P) | 178.3177 days |
Semi-major axis (a) | 9.29 mas |
Eccentricity (e) | 0.5286 |
Inclination (i) | 75.76° |
Longitude of the node (Ω) | 304.64° |
Periastron epoch (T) | 2435319.7305 |
Argument of periastron (ω) (secondary) | 2.62° |
Details | |
Luminosity | 6.42[3] L☉ |
Metallicity [Fe/H] | +0.12[3] dex |
Other designations | |
Database references | |
SIMBAD | data |
Pi Piscis Austrini, Latinized from π Piscis Austrini, is spectroscopic binary in the constellation Piscis Austrinus, with a well-determined period of 178.3177 days and an apparent magnitude of +5.12.[6] It is approximately 93 light years from Earth.
The temperatures are 7400 Kelvin for Pi PsA A and 6900 for Pi PsA B, as well as their estimated brightness ratio, and get luminosities of 3.4 and 2.6 times that of the Sun.[6]
Pi Piscis Austrini is moving through the Galaxy at a speed of 16.3 km/s relative to the Sun. Its projected Galactic orbit carries it between 24,100 and 37,300 light years from the center of the Galaxy.[7]
References
- 1 2 3 4 5 van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- 1 2 "* pi. PsA". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 7 January 2017.
- 1 2 3 4 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
- 1 2 "UBV Photometry of Some Southern Stars (Second List)". Monthly Notes of the Astron. Soc. Southern Africa. 32: 11. 1973. Bibcode:1973MNSSA..32...11C.
- ↑ ESA (1997). "The Hipparcos and Tycho Catalogues". VizieR On-line Data Catalog. Bibcode:1997yCat.1239....0E.
- 1 2 PI PSA (Pi Piscis Austrini)
- ↑ Pi Piscis Austrini (HIP 113860)
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