Alfa Phoenicis

Alfa Phoenicis
HR-designaatio 99
HD-designaatio 2261
Fyysiset ominaisuudet
Spektriluokka K0IIIb
Väri-indeksi B-V 1,08
Lämpötila 4700-4800 K
Säde 15 R☉
Astrometriset ominaisuudet
Tähdistö Feeniks
Rektaskensio (J2000) 00h 26m 17,05140s
Deklinaatio (J2000) –42° 18′ 21,5539″
Etäisyys 85 ± 2 vv
(26,0 ± 0,5 pc)
Parallaksi 38,50 ± 0,73 mas

Alfa Phoenicis (α Phe / α Phoenicis /alp Phe) eli Ankaa tai Nair al-Zaurak, Cymbae, Lucida Cymbae on Feeniksin tähdistön kirkkain tähti, suuruusluokaltaan 2,40. Tähti on spektroskooppinen kaksoistähti, mutta Ankaan B-komponentista ei tiedetä juuri mitään, vaikka se on havaittu kahdella tavalla: sekä A-tähden spektriviivojen vaihteluna että suoraan. Sen kiertoaika on 10.5 vuotta ja radan keskietäisyys 7 AU.[1] Absoluuttinen kirkkaus 0,52. Pyörimisnopeus 2 km/s tai suurempi; tähden pyörähdys kestää noin vuoden. Ankaa on vakaassa heliumin polttovaiheessa.

Lähteet

  1. ↑ Jim Kaler: Ankaa Stars. University of Illinois. Viitattu 31.1.2013.
Feeniksin tähdistö (Phoenix) » luettelo tähdistä, luokka
Tähdetα Phe, β Phe, γ Phe, ε Phe, κ Phe, δ Phe, ζ Phe, η Phe, ψ Phe, μ Phe, ι Phe, λ1 Phe, ν Phe, φ Phe, π Phe, χ Phe, σ Phe, υ Phe, ρ Phe, 120 Phe, λ2 Phe, τ Phe, ξ Phe, θ Phe, ω Phe, HE0107-5240
EksoplaneetatHD 5388
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