Alfa Reticuli

Alfa Reticuli
Alfa Reticuli (100x100)
Poloha hvězdy v souhvězdí Sítě
Astrometrická data
(Ekvinokcium J2000.0)
SouhvězdíDrak (Draco)
Rektascenze04h 14m 25.47s
Deklinace−62°28′25.6926″
Paralaxa20.3431 ± 0.1859 mas
Vzdálenost160 ± 1 ly
(49,2 ± 0,4 pc)
Barevný index (U-B)+0,63
Barevný index (B-V)+0,92
Barevný index (V-R)+0,65
Barevný index (R-I)+0,44
Zdánlivá hvězdná velikost3,36
Absolutní hvězdná velikost−0,104 ± 0,041
Radiální rychlost+35,5 km/s
Vlastní pohyb v rektascenzi+45,069" za rok
Vlastní pohyb v deklinaci+42,948" za rok
Fyzikální charakteristiky
Spektrální typG8 II-III
Hmotnost3,12 ± 0.03 M
Poloměr12,09 ± 0,33 R
Zářivý výkon (V)103 ± 4 L
Povrchová teplota5 288 ± 45 K
Rychlost rotace4,67 ± 0.36 km/s
Další označení
Henry Draper CatalogueHD 27256
Bright Star katalogHR 1336
SAO katalogSAO 248969
Katalog HipparcosHIP 19780
Tychův katalogTYC 8869-2461-1
General CatalogueGC 5164
Bayerovo označeníα Ret
SynonymaCPD-62 332, FK5 156, IRAS 04137-6235, 2MASS J04142547-6228258
Databáze
SIMBADdata
(V) – měření provedena ve viditelném světle
Některá data mohou pocházet z datové položky.

Alfa Reticuli (α Reticuli, α Ret) je nejjasnější hvězda v souhvězdí Sítě. Jde o jasného obra spektrální třídy G8 o zdánlivé hvězdné velikosti 3,36m. Jeví se jako samostatná hvězda vzdálená od Země 160 světelných let. Vzhledem k tomu, že se nachází daleko na jihu, je nejlépe pozorovatelná z jižní polokoule a lze ji spatřit pouze jižně od 27,5° severní zeměpisné šířky.

Vlastnosti

Hvězda má více než trojnásobek sluneční hmotnosti a její stáří je asi 330 milionů let.

Bylo pozorováno rentgenové záření z hvězdy o intenzitě 3×1022 W.

Reference

V tomto článku byl použit překlad textu z článku Alpha Reticuli na anglické Wikipedii.


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