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{{Starbox begin |
name=Alfa Južnog križa}}
<!--{{Starbox image |
image= |
caption=.
''NASA&nbsp;photo''. }}-->
{{Starbox observe |
epoch=J2000 |
ra=12<sup>h</sup> 26<sup>m</sup> 35,89522<sup>s</sup> |
dec=−63&deg; 05&prime; 56,7&Prime; |
appmag_v=0.76 |
constell=[[Južni križ]] }}
{{Starbox character |
class=B0.5IV + B1V |
b-v=−0.26 |
u-b= |
variable= }}
{{Starbox astrometry |
radial_v=-−11.2 / −0.6 |
prop_mo_ra=−35,83 |
prop_mo_dec=−14,86 |
parallax=10,13 ± 0,50 |
p_error=0,48 |
dist_ly=320 ± 20 |
dist_pc=99 ± 5 |
absmag_v=−3,77 }}
{{Starbox detail|
| component1 = α<sup>1</sup>
| metal_fe =
| mass = 17,80 + 6,05
| radius = 7,8<ref>https://www.wolframalpha.com/input/?i=acrux+luminosity</ref>
| rotation =
| luminosity = 25.000
| rotational_velocity = 120<ref name=dravins/>
| temperature = 24.000<ref name=dravins>{{cite journal|bibcode=2010SPIE.7734E..0AD|arxiv=1009.5815|title=Stellar intensity interferometry: Astrophysical targets for sub-milliarcsecond imaging|journal=Proceedings of the SPIE|volume=7734|pages=77340A|author1=Dravins|first1=Dainis|last2=Jensen|first2=Hannes|last3=Lebohec|first3=Stephan|last4=Nuñez|first4=Paul D.|year=2010|doi=10.1117/12.856394|series=Optical and Infrared Interferometry II}}</ref>
| component2 = α<sup>2</sup>
| metal_fe2 =
| mass2 = 15,52<ref name="Tokovinin1997"/>
| radius2 = 5,4
| luminosity2 = 16.000
| rotational_velocity2 = 200<ref name=dravins/>
| temperature2 = 28.000<ref name=dravins/>
| age_myr2 = 10.8<ref name=tetzlaff>{{cite journal|bibcode= 2011MNRAS.410..190T|title= A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun|journal= Monthly Notices of the Royal Astronomical Society|volume= 410|issue= 1|pages= 190–200|author1= Tetzlaff|first1= N.|last2= Neuhäuser|first2= R.|last3= Hohle|first3= M. M.|year= 2011|doi= 10.1111/j.1365-2966.2010.17434.x|arxiv = 1007.4883 }}</ref>}}
{{Starbox catalog |
names=α Crucis, HIP 60718, CPD−62°2745, WDS J12266-6306, CCDM J12266-6306
α1 Cru: Acrux, HR 4730, HD 108248, FK5 462, GC 16952, 26 G. Crucis
α2 Cru: HR 4731, HD 108249, GC 16953, 2MASS J12263615-6305571, 27 G. Crucis }}
{{Starbox end}}
'''Alfa Južnog križa''' označena '''α Crucis''' ( latiniziranom na '''alfa Crucis,''' skraćeno '''alfa CRU-a,''' '''α CRU)''' je [[Zvjezdani sustav|višestruki sustav zvijezda]] 321 [[Svjetlosna godina|svjetlosnih godina]] od [[Sunce|Sunca]] <ref name="aaa474_2_653"><cite class="citation" id="CITEREFvan_Leeuwen2007">van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", ''Astronomy and Astrophysics'', '''474''' (2): 653–664, [[arXiv]]:<span class="cs1-lock-free" title="Freely accessible">[//arxiv.org/abs/0708.1752 0708.1752]</span>, [[Bibcode]]:[https://ui.adsabs.harvard.edu/abs/2007A&A...474..653V 2007A&#x26;A...474..653V], [[Digital object identifier|doi]]:[[doi:10.1051/0004-6361:20078357|10.1051/0004-6361:20078357]]</cite></ref> u zviježđu [[Južni križ|Južnog križa]]. Sa kombiniranom [[Prividna magnituda|prividnom magnitudom]] od +0,76, to je najsvjetliji objekt u Južnom križu i [[Popis najsvjetlijih zvijezda|13. najsjajnija zvijezda]] na noćnom nebu . To je najjužnija zvijezda prvog stupnja, 2,3 stupnja južnije od [[Alfa Centaura|Alfe Centaura]] . <ref>{{Citiranje knjiga|Chapter=Federative Republic of Brazil: Constellations in the Breeze|Title=Flags of the Night Sky|Date=12 August 2013|Pages=1–72|Publisher=Springer|Location=New York}}</ref>