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Epsilon1 Arae

{{Short description|Star in the constellation Ara}}

{{for|other star systems with this Bayer designation|Epsilon Arae}}

{{DISPLAYTITLE:Epsilon1 Arae}}

{{Starbox begin

| name = Epsilon1 Arae

}}

{{Starbox image

| image =

{{Location mark

| image=Ara IAU.svg

| alt= | float=center | width=240 | label=|position=right

| mark=Red circle.svg | mark_width=10 | mark_link=δ Arae

| x%=60.7 | y%=42.2

}}

| caption = The location of ε1 Arae (circled)

}}

{{Starbox observe

| epoch = J2000.0

| ra = {{RA|16|59|35.048}}

| dec = {{DEC|-53|09|37.58}}

| appmag_v = +4.068

| constell = Ara

}}

{{Starbox character

| class = K3 III

| r-i =

| v-r =

| b-v = +1.45

| u-b = +1.71

| variable =

}}

{{Starbox astrometry

| radial_v = +23.85{{±|0.03}}

| prop_mo_ra = +1.015

| prop_mo_dec = +21.455

| pm_footnote =

| parallax = 8.8520

| p_error = 0.1517

| parallax_footnote =

| absmag_v = −0.79{{±|0.16}}

}}

{{Starbox detail

| source =

| mass = 1.63{{±|0.21}}

| radius = 29.52{{±|2.45}}

| luminosity = 347{{±|90|71}}

| temperature = 4,302{{±|45}}

| metal_fe = −0.19{{±|0.06}}

| gravity = 1.85{{±|0.07}}

| rotational_velocity = 4.20{{±|0.45}}

| age_gyr = 1.82{{±|0.60}}

}}

{{Starbox catalog

| names = {{odlist | CPD=-52°10372 | FK5=632 | HD=152980 | HIP=83153 | HR=6295 | SAO=244331 | GC=22869 | PPM=345574 }}

}}

{{Starbox reference

| Simbad = HR+6295

}}

{{Starbox end}}

Epsilon1 Arae is a star in the southern constellation Ara, the Altar. Its name is a Bayer designation that is Latinized from ε1 Arae, and abbreviated Epsilon1 Ara or ε1 Ara. This star is visible to the naked eye with an apparent visual magnitude of +4.1 Based upon an annual parallax shift of {{val|8.85|ul=mas}}, this star is approximately {{Convert|368|ly|pc|abbr=off|lk=on}} distant from the Earth. It is drifting further away with a radial velocity of +24 km/s.

ε1 Arae is an evolved giant star with a stellar classification of K3 III. It is around 63% more massive than the Sun. At an age of about 1.8 billion years, the outer envelope of the star has expanded to almost 30 times the Sun's radius. It is radiating 347 times the luminosity of the Sun from its photosphere at an effective temperature of 4,302 K, giving it the orange-hued glow of a K-type star.

ε1 Arae was known as {{lang|zh|龜一}}(spelled as "Guī yī", meaning: "the 1st (star) of {{lang|zh-Latn|Guī}}") in traditional Chinese astronomy.Chevalier, S., and Tsuchihashi, P., (1911): "Catalogue d'Étoiles fixes, observés a Pekin sous l'Empereur Kien Long (Qianlong (Chien-Lung)), XVIIIe siecle", Annales de l'Observatoire Astronomique de Zô-Sé.{{lang|zh|伊世同}} (Yi Shi Tong) (1981): {{lang|zh|『中西対照恒星図表』科学出版社}}.{{in lang|zh}}

Allen erroneously called it Tso Kang ({{lang|zh|左更}}). He probably confused the constellation "Ara" with "Ari", as Tso Kang is actually in Aries.

References

{{Reflist|refs=

{{cite Gaia EDR3|5935906628641616128}}

{{citation

| title=Precise radial velocity measurements of G and K giants. Multiple systems and variability trend along the Red Giant Branch

| last1=Setiawan | first1=J. | last2=Pasquini | first2=L.

| last3=da Silva | first3=L. | last4=Hatzes | first4=A. P.

| last5=von der Lühe | first5=O. | last6=Girardi | first6=L.

| last7=de Medeiros | first7=J. R. | last8=Guenther | first8=E.

| display-authors=1 | journal=Astronomy and Astrophysics

| volume=421 | pages=241–254 | date=July 2004

| doi=10.1051/0004-6361:20041042-1 | bibcode=2004A&A...421..241S

| postscript=. | doi-access=free }}

{{citation | last1=Houk | first1=Nancy | title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=2 | location=Ann Arbor | publisher=Dept. of Astronomy, University of Michigan | date=1978 | bibcode=1978mcts.book.....H | postscript=. }}

{{citation | display-authors=1 | last1=Johnson | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | date=1966 | page=99 | bibcode=1966CoLPL...4...99J | postscript=. }}

{{citation | display-authors=1 | last1=Soubiran | first1=C. | last2=Le Campion | first2=J.-F. | last3=Cayrel de Strobel | first3=G. | last4=Caillo | first4=A. | title=The PASTEL catalogue of stellar parameters | journal=Astronomy and Astrophysics | volume=515 | page=A111 |date=June 2010 | doi=10.1051/0004-6361/201014247 | bibcode=2010A&A...515A.111S | postscript=. |arxiv = 1004.1069 | s2cid=118362423 }}

{{citation | display-authors=1 | last1=da Silva | first1=L. | last2=Girardi | first2=L. | last3=Pasquini | first3=L. | last4=Setiawan | first4=J. | last5=von der Lühe | first5=O. | last6=de Medeiros | first6=J. R. | last7=Hatzes | first7=A. | last8=Döllinger | first8=M. P. | last9=Weiss | first9=A. | title=Basic physical parameters of a selected sample of evolved stars | journal=Astronomy and Astrophysics | volume=458 | issue=2 |date=November 2006 | pages=609–623 | doi=10.1051/0004-6361:20065105 | bibcode=2006A&A...458..609D | postscript=. |arxiv = astro-ph/0608160 | s2cid=9341088 }}

{{cite simbad | title=eps01 Ara | access-date=2012-07-28 | postscript=. }}

{{citation |title=The Colour of Stars |date=December 21, 2004 |work=Australia Telescope, Outreach and Education |publisher=Commonwealth Scientific and Industrial Research Organisation |url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |access-date=2012-07-21 |postscript=. |url-status=dead |archive-url=https://web.archive.org/web/20120318151427/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |archive-date=2012-03-18 }}

{{citation | last=Allen | first=R. H. | date=1963 | author-link=Richard Hinckley Allen | title=Star Names: Their Lore and Meaning | edition=Reprint | publisher=Dover Publications Inc. | location=New York, NY | isbn=0-486-21079-0 | page=64 | url=https://books.google.com/books?id=5xQuAAAAIAAJ| postscript=. }}

{{citation | postscript=.

| title=Stellar parameters and chemical abundances of 223 evolved stars with and without planets

| last1=Jofré | first1=E. | last2=Petrucci | first2=R.

| last3=Saffe | first3=C. | last4=Saker | first4=L.

| last5=Artur de la Villarmois | first5=E. | last6=Chavero | first6=C.

| last7=Gómez | first7=M. | last8=Mauas | first8=P. J. D.

| display-authors=1 | journal=Astronomy & Astrophysics

| volume=574 | date=2015 | page=A50

| issn=0004-6361 | doi=10.1051/0004-6361/201424474

| arxiv=1410.6422 | bibcode=2015A&A...574A..50J }}

}}

External links

  • [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+152980&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id Simbad Epsilon1 Arae]
  • [http://aladin.u-strasbg.fr/AladinPreview?-c=16+59+35.0477-53+09+37.576&ident=HD+152980&submit=Aladin+previewer Image Epsilon1 Arae]
  • [http://aeea.nmns.edu.tw/2006/0607/ap060701.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 1 日] {{Webarchive|url=https://web.archive.org/web/20110928011233/http://aeea.nmns.edu.tw/2006/0607/ap060701.html |date=2011-09-28 }}{{in lang|zh}}

{{Stars of Ara}}

{{DEFAULTSORT:Epsilon1 Arae}}

Category:K-type giants

Category:Ara (constellation)

6295

Arae, Epsilon1

Category:Durchmusterung objects

152980

085153

Guī yī