Acrux

Alpha Crucis
Die posisie van Acrux.
Sterrebeeld	Suiderkruis
Spektraaltipe	B0,5IV / B1V[1]
Waarnemingsdata (Epog J2000)
Regte klimming	12h 26m 35.89522s[2]
Deklinasie	-63° 05′ 56.7343″[2]
Skynmagnitude (m)	0,76[3] (1,33 / 1,75)[4]
Absolute magnitude (M)	-3,77[5] (-2,2 / -2,7)[6]
B-V-kleurindeks	-0,26[3]
Besonderhede
Massa (M☉)	α1: 17,80 / α2α1: 15,52[4]
Ligsterkte (L☉)	α1: 25 000 / α2α1: 16 000[7]
Ouderdom (jaar)	10,8 miljoen[8]
Temperatuur (K)	α1: 24 000/ α2α1: 28 000[9]
Rotasiespoed (km/s)	α1: 120 / α2α1: 200[9]
Ander name
α Crucis, HIP 60718, CPD−62°2745, WDS J12266-6306, CCDM J12266-6306 α1: HR 4730, HD 108248, FK5 462, GC 16952, 26 G. Crucis α2: HR 4731, HD 108249, GC 16953, 2MASS J12263615-6305571, 27 G. Crucis
Portaal    Sterrekunde

Alpha Crucis (α Crucis, afgekort as Alpha Cru of α Cru) is ’n sterregroep sowat 321 ligjare van die Son af^[2][10] in die sterrebeeld en asterisme Suiderkruis (Crux). Met ’n gesamentlike skynbare magnitude van 0,76 is dit die helderste ster in die Suiderkruis en die 13de helderste ster in die naglug. Dit is die mees suidelik geleë eerstemagnitude-ster, net effens meer suid as Alpha Centauri.^[11]

Alpha Crucis lyk met die blote oog soos ’n enkele ster, maar dit is eintlik ’n groep van verskeie sterre. Twee komponente kan visueel onderskei word: α¹ Crucis en α² Crucis; ook genoem α Crucis A en α Crucis B. Albei is B-tipe sterre, wat baie swaarder en helderder as die Son is. α¹ Crucis is self ’n spektroskopiese dubbelster met die komponente α Crucis Aa (ook bekend as Acrux)^[12] en α Crucis Ab.

1. ↑ Verwysingfout: Invalid <ref> tag; no text was provided for refs named houk1979
2. ↑ ^{2,0 2,1 2,2} Verwysingfout: Invalid <ref> tag; no text was provided for refs named aaa474_2_653
3. ↑ ^{3,0 3,1} Corben, P. M. (1966). "Photoelectric magnitudes and colours for bright southern stars". Monthly Notes of the Astron. Soc. Southern Africa. 25: 44. Bibcode:1966MNSSA..25...44C.
4. ↑ ^{4,0 4,1} Tokovinin, A. A. (1997). "MSC – a catalogue of physical multiple stars". Astronomy and Astrophysics Supplement Series. 124 (1): 75–84. Bibcode:1997A&AS..124...75T. doi:10.1051/aas:1997181. ISSN 0365-0138.
5. ↑ Kaltcheva, N. T.; Golev, V. K.; Moran, K. (2014). "Massive stellar content of the Galactic supershell GSH 305+01-24". Astronomy & Astrophysics. 562: A69. Bibcode:2014A&A...562A..69K. doi:10.1051/0004-6361/201321454.
6. ↑ Van de Kamp, Peter (1953). "The Twenty Brightest Stars". Publications of the Astronomical Society of the Pacific. 65: 30. Bibcode:1953PASP...65...30V. doi:10.1086/126523.
7. ↑ Verwysingfout: Invalid <ref> tag; no text was provided for refs named kaler
8. ↑ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410: 190–200. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x.
9. ↑ ^{9,0 9,1} Dravins, Dainis; Jensen, Hannes; Lebohec, Stephan; Nuñez, Paul D. (2010). "Stellar intensity interferometry: Astrophysical targets for sub-milliarcsecond imaging". Proceedings of the SPIE. Optical and Infrared Interferometry II. 7734: 77340A. arXiv:1009.5815. Bibcode:2010SPIE.7734E..0AD. doi:10.1117/12.856394.
10. ↑ Verwysingfout: Invalid <ref> tag; no text was provided for refs named GSM
11. ↑ Bordeleau, André G. (12 Augustus 2013). "Federative Republic of Brazil: Constellations in the Breeze". Flags of the Night Sky. New York: Springer. pp. 1–72. doi:10.1007/978-1-4614-0929-8_1. ISBN 978-1-4614-0928-1. Besoek op 18 Oktober 2016.
12. ↑ "IAU Catalog of Star Names" (in Engels). Geargiveer vanaf die oorspronklike op 20 April 2020. Besoek op 21 November 2016.