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Beta Phoenicis
Observation data; Epoch J2000 Equinox J2000
Constellation	Phoenix
Right ascension	01h 06m 05.03952s
Declination	−46° 43′ 06.2785″
Apparent magnitude (V)	3.30; (4.10 / 4.19)
Characteristics
Spectral type	G8III + G8III:
Astrometry
Proper motion (μ)	RA: −80.81 mas/yr ; Dec.: +34.97 mas/yr
Parallax (π)	17.63 ± 2.09 mas
Distance	approx. 190 ly ; (approx. 57 pc)
Absolute magnitude (MV)	0.29
Orbit
Period (P)	170.7±5.0 yr
Semi-major axis (a)	0.946±0.016″
Eccentricity (e)	0.718±0.016
Inclination (i)	144.0±1.5°
Longitude of the node (Ω)	126.4±3.5°
Periastron epoch (T)	2003.41±0.10
Argument of periastron (ω); (secondary)	293.5±4.4°
Details
Mass	2.7–3 M☉
Radius	~14/~14 R☉
Luminosity	~100/~100 L☉
Temperature	5,090 K
Rotational velocity (v sin i)	11.4±0.6 km/s
Other designations
	CD−47 324, HD 6595, HIP 5165, HR 322, SAO 215365.
Database references
SIMBAD	data

Beta Phoenicis (β Phoenicis, β Phe) is a binary star in the constellation Phoenix. Its apparent magnitude is 3.30,^[2] meaning that it can be seen with the naked eye (see Bortle scale).

The distance to Beta Phoenicis is poorly known. The original reduction of the Hipparcos satellite's data yielded a parallax value of 16 milliarcseconds, yet its standard error was larger than the parallax value itself.^[10] An individual note in the Hipparcos catalogue provided a more likely parallax of 17.63±2.09 mas, corresponding to a distance of 185±22 light-years,^[5] consistent with the expected distance implied by the absolute visual magnitude of a G8 giant.^[8] The new reduction of the Hipparcos data gave 0.12 ± 14.62 milliarcseconds, still unusable.^[1] The General Catalogue of Trigonometric Parallaxes, an older catalogue of ground-based parallaxes, lists the parallax as 20 ± 16 milliarcseconds, corresponding to about 200 light-years (61 pc).^[11]

Beta Phoenicis is a relatively wide visual binary consisting of two G-type giant stars, both with spectral types of G8III.^[4] The two orbit each other every 170.7 years and have a relatively eccentric orbit. The stars are separated by almost one arcsecond.^[7]

Notes

^ Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
${\sqrt {{\biggl (}{\frac {5,772}{4,950}}{\biggr )}^{4}\cdot 100}}=13.6\ R_{\odot }$ .

References

^ ^a ^b ^c ^d ^e van Leeuwen, F. (November 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, S2CID 18759600.
^ ^a ^b Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
^ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 2017-08-01. Retrieved 2017-03-11.
^ ^a ^b Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
^ ^a ^b "Hipparcos notes: General notes". vizier.cds.unistra.fr. Retrieved 2024-07-20.
^ ^a ^b ^c Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, S2CID 53666672.
^ ^a ^b Argyle, R. W.; et al. (May 2015). "Micrometric measures and orbits of southern visual double stars". Astronomische Nachrichten. 336 (4): 378–387. Bibcode:2015AN....336..378A. doi:10.1002/asna.201412166.
^ ^a ^b ^c ^d "Beta Phoenicis". stars.astro.illinois.edu. Retrieved 2024-07-20.
^ "* bet Phe". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-09-02.
^ Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics. 323: L49 – L52. Bibcode:1997A&A...323L..49P.
^ van Altena, W. F.; Lee, J. T.; Hoffleit, E. D. (1995). The General Catalogue of Trigonometric [Stellar] Parallaxes (4th ed.). New Haven, CT: Yale University Observatory. Bibcode:1995gcts.book.....V.