Xi2 Sagittarii

{{other stars by Bayer designation|Xi Sagittarii{{!}}ξ Sagittarii}}

{{Starbox begin

| name = Xi² Sagittarii

}}

{{Starbox image

| image =

{{Location mark

| image=Sagittarius IAU.svg

| float=center | width=250 | position=right

| mark=Red circle.svg | mark_width=10 | mark_link=ξ^2 Sgr

| x%=51.0 | y%=34.2

}}

| caption=Location of ξ² Sagittarii (circled)

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Sagittarius

| ra = {{RA|18|57|43.80}}

| dec = {{DEC|−21|06|23.97}}

| appmag_v = +3.51

}}

{{Starbox character

| class = G8/K0 II/III

| b-v = +1.18

| u-b = +1.13

| variable =

}}

{{Starbox astrometry

| radial_v = −20.10

| prop_mo_ra = 33.52

| prop_mo_dec = -13.552

| pm_footnote =

| parallax = 8.4092

| p_error = 0.1972

| parallax_footnote =

| dist_footnote =

| absmag_v = −1.72

}}

{{Starbox detail

| source =

| mass = {{val|3.627|0.143}}

| radius = {{val|26.747|1.97}}

| luminosity = 676

| temperature = {{val|4682|75|fmt=commas}}

| gravity = {{val|2.39|0.19}}

| metal_fe = {{val|0|0.5}}

| rotational_velocity =

| age_myr = {{val|253|33}}

}}

{{Starbox catalog

| names = {{odlist | B=ξ² Sgr | F=37 Sgr | BD=−21° 5201 | FK5=710 | HD=175775 | HIP=93085 | HR=7150 | SAO=187504 }}

}}

{{Starbox reference

| Simbad = ksi02+Sgr

}}

Xi² Sagittarii, Latinized from ξ² Sagittarii, is a star in the zodiac constellation of Sagittarius. Data collected during the Hipparcos mission suggests it is an astrometric binary, although nothing is known about the companion. It is visible to the naked eye with a combined apparent visual magnitude of +3.51. Based upon an annual parallax shift of {{val|8.4|ul=mas}} as seen from Earth, this system is located around 390 light years from the Sun.

The spectrum of Xi² Sagittarii yields a mixed stellar classification of G8/K0 II/III, showing traits of a G- or K-type giant or bright giant star. It has an estimated 3.6 times the mass of the Sun and about 27 times the Sun's radius. At an age of around 380 million years, it is radiating 676 times the Sun's luminosity from its photosphere at an effective temperature of 4,541 K.

References

{{reflist|refs=

{{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=Makarov | first1=V. V. | last2=Kaplan | first2=G. H.

| title=Statistical Constraints for Astrometric Binaries with Nonlinear Motion

| journal=The Astronomical Journal | postscript=.

| volume=129 | issue=5 | pages=2420–2427 | date=May 2005

| doi=10.1086/429590 | bibcode=2005AJ....129.2420M | doi-access=free }}

{{citation

| display-authors=1 | last1=Frankowski | first1=A.

| last2=Jancart | first2=S. | last3=Jorissen | first3=A.

| title=Proper-motion binaries in the Hipparcos catalogue. Comparison with radial velocity data

| journal=Astronomy and Astrophysics

| volume=464 | issue=1 | pages=377–392 |date=March 2007

| doi=10.1051/0004-6361:20065526 | bibcode=2007A&A...464..377F

| arxiv=astro-ph/0612449 | s2cid=14010423 | postscript=. }}

{{Cite journal |last1=Gomes da Silva |first1=J. |last2=Santos |first2=N. C. |last3=Adibekyan |first3=V. |last4=Sousa |first4=S. G. |last5=Campante |first5=T. L. |last6=Figueira |first6=P. |last7=Bossini |first7=D. |last8=Delgado-Mena |first8=E. |last9=Monteiro |first9=M. J. P. F. G. |last10=de Laverny |first10=P. |last11=Recio-Blanco |first11=A. |last12=Lovis |first12=C. |date=2021-02-01 |title=Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample. I. A catalogue of homogeneous chromospheric activity |url=https://ui.adsabs.harvard.edu/abs/2021A&A...646A..77G |journal=Astronomy and Astrophysics |volume=646 |pages=A77 |doi=10.1051/0004-6361/202039765 |issn=0004-6361|arxiv=2012.10199 |bibcode=2021A&A...646A..77G }} [https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/A%2BA/646/A77&Star=ksi02%20Sgr Xi2 Sagittarii's database entry] at VizieR.

{{citation

| title=Abundances in the Local Region. I. G and K Giants

| last1=Luck | first1=R. Earle

| journal=Astronomical Journal | postscript=.

| volume=150 | issue=3 | at=88 | year=2015

| bibcode=2015AJ....150...88L | doi=10.1088/0004-6256/150/3/88 |arxiv = 1507.01466 | s2cid=118505114 }}

{{citation

| last1=Houk | first1=Nancy | last2=Smith-Moore | first2=M.

| title=Michigan catalogue of two-dimensional spectral types for the HD stars

| volume=4 | publication-place=Ann Arbor | year=1978

| publisher=Dept. of Astronomy, University of Michigan

| bibcode=1988mcts.book.....H | postscript=. }}