Gacrux

Gacrux
Gacrux (100x100)
Astrometrická data
(Ekvinokcium J2000,0)
SouhvězdíSouhvězdí Jižního kříže
Rektascenze187,791 498 376°
Deklinace−57,113 213 457°
Paralaxa36,83 mas
Vzdálenost88 ly
Barevný index (U-B)+1.78
Barevný index (B-V)+1.59
Zdánlivá hvězdná velikost1,64
Absolutní hvězdná velikost−0,52
Vlastní pohyb v rektascenzi28,23 mas/rok
Vlastní pohyb v deklinaci−265,08 mas/rok
Fyzikální charakteristiky
Typ proměnnostiSRV
Spektrální typM3.5III
Hmotnost3 M☉
Poloměr84 R☉
Zářivý výkon (V)1 500 L☉
Povrchová teplota3 400 K
Další označení
Henry Draper CatalogueHD 108903
Bright Star katalogHR 4763
2MASS2MASS J12310993-5706474
SAO katalogSAO 240019
Katalog HipparcosHIP 61084
Tychův katalogTYC 8654-3422-1
General CatalogueGC 17052
Glieseho katalogGJ 470
Bayerovo označeníγ Cru
(V) – měření provedena ve viditelném světle
Některá data mohou pocházet z datové položky.

Gacrux (Gamma Crucis, γ Crucis) je červený obr v souhvězdí Kříže. Je to 26. nejjasnější hvězda oblohy. V souhvězdí představuje horní vrchol kříže. Je to nejbližší červený obr typu M ke Slunci, a k tomu má spektrální typ M3.5III[1][2]. Měřením byla zjištěna vzdálenost přibližně 88 ly.[3][4][5]

Gacrux je klasifikován jako polopravidelná proměnná hvězda. Její normální jas je zhruba +1.64.

Reference

  1. ↑ Gacrux / Gamma Crucis 2?. www.solstation.com [online]. [cit. 2021-07-08]. Dostupné online. 
  2. ↑ Gamma Crucis. Oxford Reference [online]. [cit. 2021-07-15]. DOI: 10.1093/oi/authority.20110803095841997. Dostupné online. DOI 10.1093/oi/authority.20110803095841997. (anglicky) 
  3. ↑ The Nine Planets [online]. 2020-01-30 [cit. 2021-07-14]. Dostupné online. (anglicky) 
  4. ↑ NOVEMBER 2013, Elizabeth Howell 22. Gacrux (Gamma Crucis): Closest Red Giant Star to Earth. Space.com [online]. [cit. 2021-07-14]. Dostupné online. (anglicky) 
  5. ↑ FORD, Dominic. Gacrux (Star). In-The-Sky.org [online]. [cit. 2021-07-18]. Dostupné online. (anglicky) 

Externí odkazy

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Gacrux, nejbližší obr typu M ke Slunci
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Hvězdy souhvězdí Jižního kříže
α • β • γ • δ • ε • ζ • η • θ1 • θ2 • ι • κ • λ • μ
Seznam hvězd souhvězdí Jižního kříže

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