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R Gruis

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Från Wikipedia
R Gruis
Observationsdata
Epok: J2000.0
StjärnbildTranan
Rektascension21t 48m 31,76s
Deklination-46° 54′ 50,74″[1]
Skenbar magnitud ()7,4-14,9 (V)[1]
Stjärntyp
SpektraltypM7II-IIIe[1]
VariabeltypMira-variabel (M)[2]
Astrometri
Radialhastighet ()-10,0 km/s
Egenrörelse (µ)RA: 7,454±0,207 mas/år
Dek.: -10,957±0,235 mas/år
Parallax ()2,3084±0,2239 mas
Andra beteckningar
GEN# +1.00207192, 2MASS J21483176-4654506, AAVSO 2142-47, ASAS J214832-4654.9, GSC 08437-00206, SKY# 41563, Gaia DR2 6564313326694802048, CSI-47-21453, HD 207192, HV 63, GCRV 72494, IRAS 21453-4708, LMW2001 169[1]

R Gruis är en pulserande variabel av Mira Ceti-typ (M)[2] i stjärnbilden Tranan. Stjärnan var den första i Tranans stjärnbild som fick en variabelbeteckning.[a]

Stjärnan varierar mellan visuell magnitud +7,4 och 14,9 med en period av 331,96 dygn.[2]

Fotnoter

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  1. ^ Variabelstjärnornas beteckningar börjar med bokstäverna R-Z, därefter A-Q, följt av RR-ZZ och AA-QQ, varefter de börjar betecknas med bokstaven V och ett ordningsnummer, från och med V335.

Se även

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Referenser

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Noter

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  1. ^ [a b c d] ”Basic data: V* R Gru – Variable Star of Mira Cet type” (på engelska). Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=R+Gru&submit=SIMBAD+search. Läst 3 oktober 2018. 
  2. ^ [a b c] ”R Gru” (på engelska). The International Variable Star Index. AAVSO – American Association of Variable Star Observers. https://www.aavso.org/vsx/index.php?view=detail.top&oid=14670. Läst 3 oktober 2018. 
v • r
Stjärnor i Tranan
Bayer
Variabler
R Gruis  · S Gruis  · T Gruis  · U Gruis  · V Gruis  · W Gruis  · X Gruis  · Y Gruis  · Z Gruis
HD
Övriga
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