Pi Virginis

{{Starbox begin

| name = π Virginis

}}

{{Starbox image

| image=

{{Location mark

|image=Virgo constellation map.svg|alt=|float=center|width=280

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=π Virginis

|x=824|y=306

}}

|caption=Location of π Virginis (circled)

}}

{{Starbox observe

| epoch = J2000

| constell = Virgo

| ra = {{RA|12|00|52.39042}}

| dec = {{DEC|+06|36|51.5571}}

| appmag_v = 4.64

}}

{{Starbox character

| class = A5 V

| b-v = +0.12

| u-b = +0.12

| variable =

}}

{{Starbox astrometry

| radial_v = −10.4

| prop_mo_ra = +0.26

| prop_mo_dec = −30.10

| parallax = 8.49

| p_error = 0.39

| parallax_footnote =

| absmag_v = −0.70

}}

{{Starbox orbit

|reference={{cite journal|title=The Hipparcos and Tycho Catalogues|author=ESA|journal=VizieR On-line Data Catalog|date=1997|bibcode=1997yCat.1239....0E}}

|primary=π Virginis A

|name=π Virginis B

|period_unitless=282.69 days

|axis_unitless=3.55 mas

|inclination=62.71

|node=149.34

|periastron=2448281.3906

|eccentricity=0.265

|periarg=312

| k1 = 26.20

}}

{{Starbox detail

| component1 = π Vir A

| mass = 2.2

| radius = 1.5

| luminosity_bolometric =

| gravity = 3.51

| temperature = 8,000

| metal_fe =

| rotational_velocity = 71

| age_gyr =

}}

{{Starbox catalog

| names = BD+07°2502, FK5 1311, HD 104321, HIP 58590, HR 4589, SAO 119164

}}

Pi Virginis (π Vir, π Virginis) is a binary star in the zodiac constellation of Virgo. It is visible to the naked eye with an apparent visual magnitude of 4.64. The distance to this star, based upon parallax measurements, is roughly 380 light years.

This is a spectroscopic binary system with a stellar classification of A5V. They have an orbital period of 283 days with an eccentricity of 0.27. The mass ratio of the two stars is about 0.47, with the primary having an estimated mass of around 2.2 times that of the Sun. The primary is a cool metallic-lined Am star.

References

{{reflist|refs=

{{citation

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| 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

| postscript=. }}

{{citation

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| doi=10.1051/0004-6361:20065224 | bibcode=2007A&A...463..671R

| arxiv=astro-ph/0610785 | s2cid=18475298 | postscript=. }}

{{citation

| last=Evans | first=D. S. | date=June 20–24, 1966

| editor1-last=Batten | editor1-first=Alan Henry

| editor2-last=Heard | editor2-first=John Frederick

| title=The Revision of the General Catalogue of Radial Velocities

| volume=30 | pages=57 | work=Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30

| location=University of Toronto | publisher=International Astronomical Union

| bibcode=1967IAUS...30...57E | postscript=. }}

{{citation

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| title=The mass ratio and initial mass functions in spectroscopic binaries

| journal=Astronomy and Astrophysics

| volume=525 | id=A26 | pages=9 | date=January 2011

| doi=10.1051/0004-6361/200913895 | bibcode=2011A&A...525A..26D

| postscript=. | url=http://www.lume.ufrgs.br/bitstream/10183/99264/1/000821103.pdf| doi-access=free | hdl=10183/99264 }}

{{citation

| title=A photometric study of chemically peculiar stars with the STEREO satellites - II. Non-magnetic chemically peculiar stars

| display-authors=1

| last1=Paunzen | first1=E. | last2=Wraight | first2=K. T.

| last3=Fossati | first3=L. | last4=Netopil | first4=M.

| last5=White | first5=G. J. | last6=Bewsher | first6=D.

| journal=Monthly Notices of the Royal Astronomical Society

| volume=429 | issue=1 | pages=119–125 | date=February 2013

| doi=10.1093/mnras/sts318 | doi-access=free

| bibcode=2013MNRAS.429..119P

| arxiv=1211.1535 | s2cid=119231581

| postscript=. }}

{{citation

| display-authors=1

| last1=Pasinetti Fracassini | first1=L. E. | last2=Pastori | first2=L.

| last3=Covino | first3=S. | last4=Pozzi | first4=A.

| title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics

| journal=Astronomy and Astrophysics

| volume=367 | issue=2 | pages=521–524 | date=February 2001

| doi=10.1051/0004-6361:20000451 | bibcode=2001A&A...367..521P

| arxiv=astro-ph/0012289 | s2cid=425754 | postscript=. }}

{{citation

| title=XHIP: An extended hipparcos compilation

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| journal=Astronomy Letters

| volume=38 | issue=5 | pages=331 | year=2012

| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015

| arxiv=1108.4971 | s2cid=119257644 | postscript=. }}

{{citation

| last1=Mermilliod | first1=J.-C.

| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)

| journal=Catalogue of Eggen's UBV Data

| date=1986

| bibcode=1986EgUBV........0M | postscript=. }}

{{citation

| title=pi. Vir -- Spectroscopic binary

| work=SIMBAD Astronomical Database

| publisher=Centre de Données astronomiques de Strasbourg

| url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=pi+vir

| access-date=2016-09-16 | postscript=. }}

}}

Virginis, Pi

Category:Virgo (constellation)

Category:Spectroscopic binaries

Category:A-type main-sequence stars

Category:Durchmusterung objects