Pi1 Octantis

{{other stars by Bayer designation|Pi Octantis{{!}}π Octantis}}

{{Starbox begin

| name = π¹ Octantis

}}

{{Starbox observe

| epoch = J2000.0 (ICRS)

| constell = Octans

| ra = {{RA|15|01|50.7983}}

| dec = {{DEC|-83|13|39.530}}

| appmag_v = 5.64{{±|0.01}}

}}

{{Starbox character

| class = G8/K0 III

| u-b = +0.74

| b-v = +0.95

}}

{{Starbox astrometry

| radial_v = 13.6{{±|0.4}}

| parallax = 8.419

| p_error = 0.0349

| parallax_footnote =

| prop_mo_ra = +18.954

| prop_mo_dec = +52.520

| pm_footnote =

| absmag_v = +0.24

}}

{{Starbox detail

| source =

| mass = 2.74{{±|0.15}}

| radius = 11.62{{±|0.21}}

| luminosity = 76.2{{±|1.7}}

| gravity = 2.7{{±|0.1}}

| temperature = 5,002{{±|36}}

| metal_fe = −0.01{{±|0.03}}

| rotational_velocity = <1

| age_myr =

}}

{{Starbox catalog

| names = {{odlist|B = π¹ Oct|HD = 130650|CPD = −82°629|FK5 = 3987|GC = 20070|HIP = 73540|HR = 5525|SAO = 258713|Gould = 21 G. Octantis}}

}}

{{Starbox reference

| Simbad = pi.01+Oct

}}

Pi¹ Octantis (Pi¹ Oct), Latinized π¹ Octantis, is a solitary star in the southern circumpolar constellation Octans. It is faintly visible to the naked eye with an apparent magnitude 5.64, and is estimated to be 387 light years away. However, it is receding with a heliocentric radial velocity of {{val|14|ul=km/s}}.

Pi¹ Oct has a stellar classification of G8/K0 III — intermediate between a G8 and K0 giant star. It has 2.74 times the mass of the Sun and an effective temperature of {{val|5002|ul=k|fmt=commas}}, giving a yellow hue. However, an enlarged radius of {{val|11.62|ul=solar radius}} yields a luminosity 76 times that of the Sun. Pi¹ Oct has a metallicity around solar level and spins with a projected rotational velocity lower than {{val|1|ul=km/s}}.

References

{{reflist||refs=

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{{cite book|last1=Houk |first1=N. |last2=Cowley |first2=A. P. |title=University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. |year=1975 |bibcode=1975mcts.book.....H }}

{{cite journal |last1=Gontcharov |first1=G. A. |title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system |journal=Astronomy Letters |date=November 2006 |volume=32 |issue=11 |pages=759–771 |doi=10.1134/S1063773706110065 |issn=1063-7737 |bibcode=2006AstL...32..759G |arxiv=1606.08053|s2cid=119231169 }}

{{cite journal |last1=Anderson |first1=E. |last2=Francis |first2=Ch. |title=XHIP: An extended hipparcos compilation |journal=Astronomy Letters |date=May 2012 |volume=38 |issue=5 |pages=331–346 |doi=10.1134/S1063773712050015 |language=en |issn=1063-7737 |bibcode=2012AstL...38..331A |arxiv=1108.4971|s2cid=255204555 }}

{{cite journal |last1=Ottoni |first1=G. |last2=Udry |first2=S. |last3=Ségransan |first3=D. |last4=Buldgen |first4=G. |last5=Lovis |first5=C. |last6=Eggenberger |first6=P. |last7=Pezzotti |first7=C. |last8=Adibekyan |first8=V. |last9=Marmier |first9=M. |last10=Mayor |first10=M. |last11=Santos |first11=N. C. |last12=Sousa |first12=S. G. |last13=Lagarde |first13=N. |last14=Charbonnel |first14=C. |title=CORALIE radial-velocity search for companions around evolved stars (CASCADES): I. Sample definition and first results: Three new planets orbiting giant stars |journal=Astronomy & Astrophysics |date=January 2022 |volume=657 |pages=A87 |doi=10.1051/0004-6361/202040078 |issn=0004-6361 |bibcode=2022A&A...657A..87O |arxiv=2201.01528 |doi-access=free}}

{{cite journal |last1=De Medeiros |first1=J. R. |last2=Alves |first2=S. |last3=Udry |first3=S. |last4=Andersen |first4=J. |last5=Nordström |first5=B. |last6=Mayor |first6=M. |title=A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆ |journal=Astronomy & Astrophysics |date=January 2014 |volume=561 |pages=A126 |doi=10.1051/0004-6361/201220762 |issn=0004-6361 |bibcode=2014A&A...561A.126D |arxiv=1312.3474|doi-access=free}}

{{cite journal | last=Gould | first=Benjamin Apthorp | title=Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas | journal=Resultados del Observatorio Nacional Argentino | volume=1 | bibcode=1879RNAO....1.....G | year=1878 | page=}}

{{cite journal | last1 = Eggleton | first1 = P. P. | last2 = Tokovinin | first2 = A. A. | title = A catalogue of multiplicity among bright stellar systems | journal = Monthly Notices of the Royal Astronomical Society | date = 11 September 2008 | volume = 389 | issue = 2 | pages = 869–879 | issn = 0035-8711 | eissn = 1365-2966 | doi = 10.1111/j.1365-2966.2008.13596.x | bibcode = 2008MNRAS.389..869E | arxiv = 0806.2878 | doi-access = free }}

}}

Category:Octans

Category:K-type giants

Category:G-type giants