Alfa Scuti

Alfa Scuti
Alfa Scuti (100x100)
Poloha hvězdy v souhvězdí Štítu
Astrometrická data
(Ekvinokcium J2000.0)
SouhvězdíŠtít (Scutum)
Rektascenze18h 35m 12,427 76s
Deklinace-8°14′38,652 9″
Paralaxa16,38±0,22 mas
Vzdálenost199 ± 3 ly
(61,1 ± 0.8 pc)
Barevný index (U-B)1,53
Barevný index (B-V)1,34
Barevný index (V-R)0,97
Barevný index (R-I)0,68
Zdánlivá hvězdná velikost3,83
Absolutní hvězdná velikost-0,11 ± 0,02
Radiální rychlost36,50 ± 0,18 km/s
Vlastní pohyb v rektascenzi-17,00 ± 0,25 mas/rok
Vlastní pohyb v deklinaci-313,52 ± 0,20 mas/rok
Fyzikální charakteristiky
Spektrální typK3III
Hmotnost1,33 M☉
Poloměr20 R☉
Povrchová teplota4 315 K
Další označení
Henry Draper CatalogueHD 171443
Bonner DurchmusterungBD -08° 4638
Bright Star katalogHR 6973
2MASS2MASS J18351242-0814383
SAO katalogSAO 142408
Katalog HipparcosHIP 91117
Tychův katalogTYC 5691-1338-1
General CatalogueGC 25385
Bayerovo označeníα Sct
SynonymaFK5 1482, GCRV 11039, IRAS 18324-0817, NSV 11056, PLX 4275, PPM 201884, UBV 15798, 1 Aquilae
Databáze
SIMBADdata
(V) – měření provedena ve viditelném světle
Některá data mohou pocházet z datové položky.

Alfa Scuti (α Sct, α Scuti) je se svou zdánlivou hvězdnou velikostí 3,83m nejjasnější hvězdou v souhvězdí Štítu. Původně hvězda patřila do souhvězdí Orla, kde měla označení 1 Aquilae[1]. Na základě ročního posunu paralaxy 16,38 mas při pohledu ze Země se nachází asi 200 světelných let od Slunce. Od Slunce se vzdaluje radiální rychlostí 36,5 km/s.

Jde o vyvinutého hvězdného obra spektrální třídy K3 III. Alpha Scuti je podezřelá proměnná hvězda, jejíž magnituda se udává v rozmezí 3,81 až 3,87.[2] Hvězda má odhadem 1,33násobek hmotnosti Slunce, ale její vnější obálka se zvětšila na 20násobek poloměru Slunce a ze své nafouknuté fotosféry vyzařuje 186násobek svítivosti Slunce při efektivní teplotě 4 315 K.

Reference

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

  1. ↑ WAGMAN, M. Flamsteed's Missing Stars. S. 209 - 223. Journal for the History of Astronomy [online]. 1987 [cit. 2024-10-07]. Čís. 18(3), s. 209 - 223. DOI 10.1177/002182868701800. Bibcode 1987JHA....18..209W. S2CID 118445625. 
  2. ↑ SAMUS, N. N. ; ET AL. VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+, 2007-2017).Chybí název periodika! [cit. 2024-10-07]. DOI 10.1051/0004-6361/202243940. Bibcode 2009yCat....102025S. 
Hvězdy souhvězdí Štítu
ζ • γ • α • δ • ε • β • η • UY
Seznam hvězd souhvězdí Štítu

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