epsilon Sagittae

{{Starbox begin

| name = Epsilon Sagittae

}}

{{Starbox image

| image =

{{Location mark

| image=Sagitta IAU.svg | alt= | float=center | width=250

| label= | position=right

| mark=Red circle.svg | mark_width=10 | mark_link=ζ Sge

| x=457 | y=512

}}

| caption=Location of ε Sagittae (circled)

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Sagitta

| ra = {{RA|19|37|17.39324}}

| dec = {{DEC|+16|27|46.0871}}

| appmag_v = +5.64 to +5.67

}}

{{Starbox character

| type = horizontal branch

| class = G8 IIIvar

| b-v = +1.00

| u-b = +0.83

| variable =

}}

{{Starbox astrometry

| radial_v = {{val|-32.49|0.18}}

| prop_mo_ra = {{val|+16.382|0.164}}

| prop_mo_dec = {{val|+14.364|0.135}}

| parallax = 5.6067

| p_error = 0.1173

| parallax_footnote = {{Cite DR2|4321830946398475776}}

| absmag_v = {{val|-0.84|0.03}}

}}

{{Starbox detail

| mass = 2.9

| radius = {{val|18.37|0.65|0.88}}

| luminosity = {{val|184.9|4.6}}

| temperature = {{val|4966|124|85}}

| gravity = 2.52

| metal_fe = +0.02

| rotational_velocity = 3.2

| age_myr = 520

}}

{{Starbox catalog

| names = {{odlist | B=ε Sge | F=4 Sge | BD=+16°3918 | HD=185194 | HIP=96516 | HR=7463 | SAO= | WDS=J19373+1628A }}

}}

{{Starbox reference

| Simbad = eps+Sge

}}

Epsilon Sagittae (ε Sagittae) is a solitary, yellow-hued star in the northern constellation of Sagitta. With an apparent visual magnitude of +5.64 to +5.67, it is faintly visible to the naked eye on a dark night. It is a variable star with a small amplitude of 0.03 magnitudes. Based upon an annual parallax shift of 5.60 mas as seen from Earth, it is located roughly 580 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.1 due to interstellar dust.

This is an evolved, G-type giant star with a stellar classification of G8 IIIvar, where the 'var' suffix indicates a variable spectral feature. The star is about 520 million years old with about three times the mass of the Sun. It is radiating 185 times the Sun's luminosity from its photosphere at an effective temperature of 4,966 K.

Epsilon Sagittae is an optical binary, with a companion of magnitude 8.35 at an angular separation of 87.3 arc seconds along a position angle of 82°, as of 2013. The companion is actually a more distant giant star approximately 7,000 light-years from Earth, with a luminosity 1,800 times that of the Sun and also designated HD 232029.{{cite DR2|4321830980758181760}}

References

{{reflist|refs=

{{citation |postscript=. |bibcode=2015A&A...574A.116R |title=Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity |last1=Reffert |first1=Sabine |last2=Bergmann |first2=Christoph |last3=Quirrenbach |first3=Andreas |last4=Trifonov |first4=Trifon |last5=Künstler |first5=Andreas |journal=Astronomy and Astrophysics |date=2015 |volume=574 |pages=A116 |doi=10.1051/0004-6361/201322360 |arxiv=1412.4634 }}

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{{citation

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| url=https://www.aavso.org/vsx/index.php?view=detail.top&oid=50837

| publisher=The International Variable Star Index

| date=17 December 2005

| access-date=14 September 2018}}

{{citation

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| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E

| arxiv=0806.2878 | s2cid=14878976 | postscript=. }}

{{citation

| display-authors=1 | last1=Takeda | first1=Yoichi

| last2=Sato | first2=Bun'ei | last3=Murata | first3=Daisuke

| title=Stellar Parameters and Elemental Abundances of Late-G Giants

| journal=Publications of the Astronomical Society of Japan

| volume=60 | issue=4 | pages=781–802 | date=August 2008

| bibcode=2008PASJ...60..781T | arxiv=0805.2434

| doi=10.1093/pasj/60.4.781 | postscript=. }}

{{citation

| title=Spectroscopic study on the beryllium abundances of red giant stars

| journal=Publications of the Astronomical Society of Japan

| volume=66 | issue=5 | pages=91 | year=2014

| last1=Takeda | first1=Yoichi | last2=Tajitsu | first2=Akito

| doi=10.1093/pasj/psu066 | bibcode=2014PASJ...66...91T

| arxiv=1406.7066 | postscript=. }}

{{citation

| last1=Argue | first1=A. N. | postscript=.

| title=UBV photometry of 550 F, G and K type stars

| journal=Monthly Notices of the Royal Astronomical Society

| volume=133 | pages=475–493 | year=1966

| issue=4 | bibcode=1966MNRAS.133..475A | doi=10.1093/mnras/133.4.475| doi-access=free}}

{{citation

| display-authors=1 | last1=Mason | first1=B. D.

| last2=Wycoff | first2=G. L. | last3=Hartkopf | first3=W. I.

| last4=Douglass | first4=G. G. | last5=Worley | first5=C. E.

| title=The Washington Visual Double Star Catalog

| postscript=. | doi = 10.1086/323920 | doi-access=free }}

{{cite simbad

| title=eps Sge | access-date=2017-07-14 | postscript=. }}

}}

Category:G-type giants

Sagittae, Epsilon

Category:Sagitta

Category:Durchmusterung objects

Category:Horizontal-branch stars