Castor (tähti)

Castor Aa/Ba
Bayerin designaatio Alpha Geminorum,Alfa Geminorum, α Geminorum,α Gem, ALP GEM, ALF GEM
Flamsteedin designaatio 66 Geminorum, 66 Gem
HR-designaatio HR 2891
HD-designaatio HD 60178/60179
Muut designaatiot YY Geminorum, Gl 278, BD +32 1581/2, GCTP 1785.00, LTT 12038, SAO 60198, FK5 287, ADS 6175, Struve 1110, HIP 36850.
Fyysiset ominaisuudet
Näennäinen kirkkaus 1,98 /2,88 mv
Absoluuttinen kirkkaus 1,33 /2,28 Mv
Valovoima 30 / 14 aurinkoa
Spektriluokka A1 V / A2 Vm
Väri-indeksi B-V 0,04
U-B 0,02
Lämpötila 10 300 / 8 840 K
Massa 2,15 / 1,7 M☉
Säde 2,3 / 1,6 R☉
Metallipitoisuus 950% / 280% Auringon
Ikä 200 miljoonaa vuotta
Astrometriset ominaisuudet
Tähdistö Gemini, Kaksoset
Rektaskensio (J2000) 07h 34m 36s
Deklinaatio (J2000) +31° 53' 18"
Etäisyys valovuotta, parsekia
Parallaksi 65,50 +- 1,10 mas
Säteisnopeus 5,2 / −1,2 km/s
Ominaisliike RA −206,33
dekl. −148,18 mas/v
Näkyy leveysasteiden 90° N
ja 59° S välillä.
Castor ja Kaksoset tähtikartassa

Castor (α Geminorum) on kuudesta komponentista muodostuva tähti Kaksosten tähdistössä. Castor ja Pollux ovat saaneet nimensä kreikkalaisen taruston kaksosten, Kastorin (lat. Castor) ja Polydeukeen (lat. Pollux) mukaan.[1] Castor kuuluu Castorin liikkuvaan tähtiryhmään, jossa on myös mm. Vega ja Fomalhaut.

Viimeistään vuonna 1718 huomattiin, että Castor on itse asiassa kaksoistähti. Saattaa olla, että Cassini oli havainnut tämän jo vuonna 1678.[2] Castorin tähtijärjestelmässä on kuusi jäsentä.[1]

Lähteet

  1. ↑ a b Castor Encyclopedia Britannica. Viitattu 20.1.2013.
  2. ↑ Double Star of the Month - February 2007 Webb Deep Sky Society. Viitattu 20.1.2013.

Aiheesta muualla

Kaksosten tähdistö (Gemini) » luettelo tähdistä, luokka
TähdetPollux, Castor A, γ Gem, μ Gem, Castor B, ε Gem, η Gem, ξ Gem, δ Gem, κ Gem, λ Gem, θ Gem, ι Gem, ζ Gem, υ Gem, ν Gem A, 1 Gem, ρ Gem, σ Gem, τ Gem, 30 Gem, 38 Gem, ο Gem, 81 Gem, χ Gem, φ Gem, 65 Gem, 57 Gem, 74 Gem, 51 Gem, 64 Gem, 56 Gem, π Gem, 26 Gem, ω Gem, 63 Gem, 68 Gem, 36 Gem, 76 Gem, 85 Gem, 28 Gem, HD 59686, 45 Gem, 70 Gem, 35 Gem, 41 Gem, 37 Gem, 3 Gem, 47 Gem, 53 Gem, 59 Gem, 5 Gem, 52 Gem, 48 Gem, 33 Gem, 61 Gem, 44 Gem, 8 Gem, 58 Gem, 82 Gem, 39 Gem, 16 Gem, 9 Gem, 20 Gem, 141 Tau, 19 Gem, 40 Gem, 25 Gem, 32 Gem, 6 Gem, 79 Gem, 15 Gem A, 10 Gem, 2 Gem, 23 Gem, HD 50554, 4 Gem, 11 Gem, 12 Gem, 49 Gem, R Gem, ν Gem B, 15 Gem B
EksoplaneetatHD 62509 b, HD 59686 b, HD 50554 b
Taivaan kirkkaimmat tähdet
Aurinko
Achernar | Acrux | Adhara | Aldebaran | Alfa Centauri | Alnilam | Altair | Antares | Arcturus | Bellatrix
Betelgeuze | Canopus | Capella | Castor | Deneb | Elnath | Fomalhaut | Gacrux | Hadar | Miaplacidus
Mimosa | Pollux | Procyon | Regulus | Rigel | Shaula | Sirius | Spica | Vega
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