Beta Phoenicis

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Binary star in the constellation Phoenix

title: "Beta Phoenicis" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["g-type-giants", "binary-stars", "phoenix-(constellation)", "bayer-objects", "durchmusterung-objects", "henry-draper-catalogue-objects", "hipparcos-objects", "bright-star-catalogue-objects"] description: "Binary star in the constellation Phoenix" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/Beta_Phoenicis" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Binary star in the constellation Phoenix ::

| image = |image=Phoenix constellation map.svg|alt=|float=center|width=280 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=β Phoenicis |x=408|y=290 | caption = Location of β Phoenicis (circled in red) | epoch = J2000 | constell = Phoenix | ra = | dec = | appmag_v = 3.30 (4.10 / 4.19) | class = G8III + G8III: | b-v = | u-b = | variable = | radial_v = | prop_mo_ra = | prop_mo_dec = | pm_footnote = | parallax = 17.63 | p_error = 2.09 | parallax_footnote = | absmag_v = 0.29 | reference= | period= | axis= | eccentricity= | inclination= | node= | periarg= | periastron= | source = | component1 = β Phe A | mass = 2.7–3 | radius = {{efn | name=radius | 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.}} | gravity = | metal_fe = | temperature = 4,950 | luminosity = 100 | rotation = | age_gyr = | component2 = β Phe B | mass2 = 2.7–3 | radius2 = | luminosity2 = 100 | metal2_fe = | temperature2 = 4,950 | names = CD−47 324, HD 6595, HIP 5165, HR 322, SAO 215365. |Simbad=bet+Phe Beta Phoenicis (β Phoenicis, β Phe) is a binary star in the constellation Phoenix. Its apparent magnitude is 3.30, meaning that it can be seen with the naked eye (see Bortle scale).

This is a relatively wide visual binary consisting of two G-type red giant stars, both with spectral types of G8III. The two orbit each other every 170.7 years and have a relatively eccentric orbit. The stars are separated by almost one arcsecond. The presence of similar-brightness stars at such separation has made parallax measurements difficult, often with margins of error higher than the standard value, since these measurements assume the star to be single. Based on the typical absolute magnitude of a G-type giant and the apparent magnitude of the stars, the distance has been estimated at 200 light-years. Despite this, a reanalysis of the (uncertain) Hipparcos data, taking in account the binarity of Beta Phoenicis, found a more likely parallax of , corresponding to a distance of .

Notes

References

| first=F. | last=van Leeuwen | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | date=November 2007 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | arxiv=0708.1752 | s2cid=18759600}}

| last1=Ammler-von Eiff | first1=Matthias | last2=Reiners | first2=Ansgar | title=New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars? | journal=Astronomy & Astrophysics | arxiv=1204.2459 | volume=542 | page=A116 | date=June 2012 | doi=10.1051/0004-6361/201118724 | bibcode=2012A&A...542A.116A | s2cid=53666672 }}

| last1=Ducati | first1=J. R. | title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system | journal=CDS/ADC Collection of Electronic Catalogues | volume=2237 | year=2002 | bibcode=2002yCat.2237....0D }}

| title = * bet Phe | accessdate=2016-09-02

| title=Micrometric measures and orbits of southern visual double stars | display-authors=1 | last1=Argyle | first1=R. W. | last2=Alzner | first2=A. | last3=van Leeuwen | first3=F. | journal=Astronomische Nachrichten | volume=336 | issue=4 | pages=378–387 | date=May 2015 | doi=10.1002/asna.201412166 | bibcode=2015AN....336..378A | doi-access=free }}

References

"Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory.
"Beta Phoenicis".
"Hipparcos notes: General notes".

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