Epsilon Crucis

{{Starbox begin

| name = ε Crucis

}}

{{Starbox image

| image=

{{Location mark

|image=Crux constellation map.svg|alt=|float=center|width=260

|label=|position=right

|mark=Red circle.svg|mark_width=12|mark_link=ε Cru

|x=752|y=510

}}

|caption=Location of ε Crucis (circled)

}}

{{Starbox observe

| epoch = J2000.0

| constell = Crux

| ra = {{RA|12|21|21.608}}

| dec = {{DEC|-60|24|04.13}}

| appmag_v = 3.58

}}

{{Starbox character

| class=K3 III

| b-v=+1.42

| u-b=+1.63

| variable=suspected

|appmag_1_passband=B

|appmag_2_passband=G

|appmag_3_passband=J

|appmag_1=4.98{{+-|0.01}}

|appmag_2=3.1

|appmag_3=1.226{{+-|0.274}}

}}

{{Starbox astrometry

| radial_v=−4.60

| prop_mo_ra=−171.223

| prop_mo_dec=91.795

|pm_footnote={{Cite Gaia DR3|6058271964884299520}}

| parallax=14.2

| p_error=0.1

| parallax_footnote=

| dist_footnote=

| absmag_v = {{Val|−0.63|0.09}}

}}

{{Starbox detail

| mass = (1.4{{snd}}1.5){{±|0.2}}

| radius = {{val|31|2}}

| luminosity = 282

| temperature = {{val|4210|125|fmt=commas}}

| gravity = 1.91

| metal_fe = −0.03

| rotational_velocity = 3.14

| age_gyr = 2.17

}}

{{Starbox catalog

| names = {{odlist | name=Ginan | B=ε Cru | CD=−59°4221 | FK5=2989 | HD=107446 | HIP=60260 | HR=4700 | SAO=251862 | NSV=5568 }}{{cite simbad|title=eps Cru}}

}}

{{Starbox reference

| Simbad = eps+Cru

}}

Epsilon Crucis, Latinised from ε Crucis (abbreviated Epsilon Cru, ε Cru) and also known as Ginan {{IPAc-en|'|g|iː|n|@|n}},{{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |access-date=16 December 2017}} is a single,{{citation | 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 | volume=389 | issue=2 | pages=869–879 | date=September 2008 | bibcode=2008MNRAS.389..869E | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | arxiv=0806.2878 | s2cid=14878976 | postscript=. }} orange-hued star in the southern constellation of Crux. Measurements made by the Gaia spacecraft showed an annual parallax shift of 14.2 mas, which provides a distance estimate of about 230 light-years. The star can be seen with the naked eye, having an apparent visual magnitude of 3.58. It is moving closer to the Sun with a radial velocity of −4.60 km/s.

This is a giant star of type K with a stellar classification of K3III, indicating that it has exhausted the hydrogen at its core and evolved away from the main sequence. It is about two billion years old with 1.4–1.5 times the mass of the Sun and has expanded to 31 times the Sun's radius. The star is shining with around 282 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,210 K.

Nomenclature

ε Crucis (Latinised to Epsilon Crucis) is the star's Bayer designation.

The star bore the traditional name Ginan in the culture of the Wardaman people of the Northern Territory of Australia,{{cite press release |url=https://www.iau.org/news/pressreleases/detail/iau1707/ |title=IAU Approves 86 New Star Names From Around the World |publisher=IAU.org |date=11 December 2017}} which refers to a dilly bag - the "Bag of Songs."{{cite press release |url=http://www.pas.rochester.edu/~emamajek/WGSN/ |title=IAU Working Group on Star Names (WGSN) |publisher=IAU.org}} In 2016, the IAU organized a Working Group on Star Names (WGSN){{cite web | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN)|access-date=22 May 2016}} to catalog and standardize proper names for stars. The WGSN approved the name Ginan for Epsilon Crucis on 19 November 2017 and it is now so included in the List of IAU-approved Star Names. According to the WGSN's 2023 annual report, this naming was in error: Ginan is actually the Wardaman name for Alpha Crucis; the name for Epsilon Crucis is Wuja, "fire". Since the name Ginan was already approved, it will not be changed. The current IAU Catalog of Star Names ({{as of|2025|04|lc=y}}) does not mention this error.

It is also sometimes called Intrometida (intrusive) in Portuguese.da Silva Oliveira, R., [http://www.asterdomus.com.br/Artigo_crux_australis.htm "Crux Australis: o Cruzeiro do Sul"] {{Webarchive|url=https://web.archive.org/web/20131206102730/http://www.asterdomus.com.br/Artigo_crux_australis.htm |date=2013-12-06 }}, Artigos: Planetario Movel Inflavel AsterDomus.

In culture

Ginan is represented on the national flags of Australia, Papua New Guinea and Samoa. It is also featured in the flag of Brazil, along with 26 other stars, each of which represents a state. It represents the State of Espírito Santo.{{cite web

|title=Astronomy of the Brazilian Flag

|url=https://flagspot.net/flags/br_astro.html

|publisher=FOTW Flags Of The World website

}}

{{multiple image

|direction = horizontal

|align= left

|width1= 188

|width2= 240

|image1=IRAS 12116-6001.jpg

|image2=Crux (Southern Cross) from Hobart, Tasmania.jpg

|footer=Left: The bright blue star on the right centre of this image is Epsilon Crucis. The colours used in this image represent specific wavelengths of infrared light. Blue represents light emitted at 3.4 and 4.6 micrometres. Right: Crux (Southern Cross) from Hobart, Tasmania.

}}

References

{{Reflist|refs=

{{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 | pages=609–623 |date=November 2006 | doi=10.1051/0004-6361:20065105 | bibcode=2006A&A...458..609D |arxiv = astro-ph/0608160 | s2cid=9341088 }}

{{cite journal|bibcode=2015A&A...574A..50J|title=Stellar parameters and chemical abundances of 223 evolved stars with and without planets|journal=Astronomy & Astrophysics|volume=574|pages=A50|last1=Jofré|first1=E|last2=Petrucci|first2=R|last3=Saffe|first3=C|last4=Saker|first4=L|last5=de la Villarmois|first5=E. Artur|last6=Chavero|first6=C|last7=Gómez|first7=M|last8=Mauas|first8=P. J. D|year=2015|doi=10.1051/0004-6361/201424474|arxiv=1410.6422|s2cid=53666931}}

{{cite journal|bibcode=1989ApJS...71..245K|title=The Perkins catalog of revised MK types for the cooler stars|journal=Astrophysical Journal Supplement Series|volume=71|pages=245|last1=Keenan|first1=Philip C|last2=McNeil|first2=Raymond C|year=1989|doi=10.1086/191373}}

{{Cite journal |last1=Kallinger |first1=T. |last2=Beck |first2=P. G. |last3=Hekker |first3=S. |last4=Huber |first4=D. |last5=Kuschnig |first5=R. |last6=Rockenbauer |first6=M. |last7=Winter |first7=P. M. |last8=Weiss |first8=W. W. |last9=Handler |first9=G. |last10=Moffat |first10=A. F. J. |last11=Pigulski |first11=A. |last12=Popowicz |first12=A. |last13=Wade |first13=G. A. |last14=Zwintz |first14=K. |date=2019-04-01 |title=Stellar masses from granulation and oscillations of 23 bright red giants observed by BRITE-Constellation |url=https://www.aanda.org/articles/aa/abs/2019/04/aa34514-18/aa34514-18.html |journal=Astronomy & Astrophysics |language=en |volume=624 |pages=A35 |doi=10.1051/0004-6361/201834514 |issn=0004-6361|arxiv=1902.07531 |bibcode=2019A&A...624A..35K }}

{{cite journal|bibcode=1986EgUBV........0M|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)|journal=Catalogue of Eggen's UBV Data|last1=Mermilliod|first1=J.-C|year=1986}}

{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}

{{cite report |author=IAU Working Group on Star Names |title=Annual Report WGSN 2023 |url=https://exopla.net/wp-content/uploads/2025/04/2023_Annual-Report-WGSN_for2023.pdf}}

{{cite web |title=IAU Catalog of Star Names |url=https://exopla.net/star-names/modern-iau-star-names/ |access-date=6 April 2025}}

}}

Crucis, Epsilon

Category:Crux

Ginan

Category:K-type giants

Category:Suspected variables