Beta Phoenicis

{{Short description|Binary star in the constellation Phoenix}}

{{Starbox begin

| name = Beta Phoenicis

}}

{{Starbox observe

| epoch = J2000

| constell = Phoenix

| ra = {{RA|01|06|05.03952}}

| dec = {{DEC|−46|43|06.2785}}

| appmag_v = 3.30
(4.10 / 4.19){{cite web|url=http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|title=Sixth Catalog of Orbits of Visual Binary Stars|work=United States Naval Observatory|access-date=2017-03-11|archive-date=2017-08-01|archive-url=https://web.archive.org/web/20170801102553/http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|url-status=dead}}

}}

{{Starbox character

| class = {{nowrap|G8III + G8III:}}

| b-v =

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v =

| prop_mo_ra = −80.81

| prop_mo_dec = +34.97

| parallax = 17.63

| p_error = 2.09

| parallax_footnote =

| absmag_v = 0.29

}}

{{Starbox orbit

| reference=

| period={{Val|170.7|5.0}}

| axis={{Val|0.946|0.016}}

| eccentricity={{Val|0.718|0.016}}

| inclination={{Val|144.0|1.5}}

| node={{Val|126.4|3.5}}

| periarg={{Val|293.5|4.4}}

| periastron={{Val|2003.41|0.10}}

}}

{{Starbox detail

| mass = 2.7–3

| radius = ~{{solar radius calculator|type=LT|100|4950}}/~{{solar radius calculator|type=LT|100|4950}}{{efn | name=radius | Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:

:$\backslash sqrt\{\backslash biggl(\backslash frac\{5,772\}\{4,950\}\backslash biggr)^4\; \backslash cdot\; 100\}\; =\; 13.6\backslash \; R\_\backslash odot$.}}

| gravity =

| metal_fe =

| temperature = 5,090

| luminosity = ~100/~100

| rotational_velocity = {{Val|11.4|0.6}}

| rotation =

| age_gyr =

}}

{{Starbox catalog

| names = CD−47 324, HD 6595, HIP 5165, HR 322, SAO 215365.

}}

{{Starbox reference

|Simbad=bet+Phe

}}

{{Starbox end}}

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).

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.{{Cite journal| author=Perryman, M. A. C.| display-authors=etal| title=The HIPPARCOS Catalogue| journal=Astronomy & Astrophysics | volume=323| pages=L49–L52 |date=April 1997| bibcode=1997A&A...323L..49P }} An individual note in the Hipparcos catalogue provided a more likely parallax of {{Val|17.63|2.09|u=mas}}, corresponding to a distance of {{Val|185|22|u=light-years}},{{Cite web |title=Hipparcos notes: General notes |url=https://vizier.cds.unistra.fr/viz-bin/VizieR-6?-out.form=+H&-source=I/239/hd_notes,I/239/hg_notes,I/239/hp_notes&HIP=5165 |access-date=2024-07-20 |website=vizier.cds.unistra.fr}} consistent with the expected distance implied by the absolute visual magnitude of a G8 giant.{{Cite web |title=Beta Phoenicis |url=http://stars.astro.illinois.edu/sow/betaphe.html |access-date=2024-07-20 |website=stars.astro.illinois.edu}} The new reduction of the Hipparcos data gave 0.12 ± 14.62 milliarcseconds, still unusable. The General Catalogue of Trigonometric Parallaxes, an older catalogue of ground-based parallaxes, lists the parallax as 20 ± 16 milliarcseconds, corresponding to about {{convert|200|ly|pc}}.{{cite book | author=van Altena, W. F. | author2=Lee, J. T. | author3=Hoffleit, E. D. | title=The General Catalogue of Trigonometric [Stellar] Parallaxes | location=New Haven, CT | publisher=Yale University Observatory | edition=4th | date=1995 | bibcode=1995gcts.book.....V }}

Beta Phoenicis is a relatively wide visual binary consisting of two G-type 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.