Kesäkolmio

Kesäkolmio

Kesäkolmio on kesäisellä yötaivaalla näkyvä asterismi, joka muodostuu Lyyran tähdistön päätähdestä Vegasta, Joutsenen Denebistä ja Kotkan Altairista[1].

Nimensä tähtikuvio on saanut muodostaan ja kesäisestä näkymisajankohdasta. Se on korkealla etelässä, kun loppukesällä illat alkavat hämärtyä ja tähdet näkyä. Tyypillisesti ensimmäinen näkyviin ilmestyvä tähti on Lyyran Vega, joka heinäkuun loppupäivinä on etelässä noin kello 23.30 lähes 70 asteen korkeudella.

Yleinen näkyvyys

Öiden pitenemisestä johtuen Kesäkolmio näkyy etelässä iltahämärissä pitkälle syksyyn. Talven tultua se katoaa kuviona läntiselle taivaalle, vaikka sekä Vega että Deneb näkyvät keskellä talvea matalalla pohjoisen suunnalla. Keväällä Kesäkolmio tulee näkyviin aamuyöllä itäiselle taivaalle.

Kesäkolmion tähdet ovat olleet ennen satelliittinavigoinnin yleistymistä tärkeitä navigointitähtiä, sillä ne näkyvät aamuyöstä hyvin selkeinä ja kirkkaina.

Vastaavia kohteita

Myös talvitaivaalle on yritetty nimetä vastaavia kuvioita, näistä talvitimantti ja talvineliö tai -suunnikas ovat ehkä tunnetuimmat. Talvineliö muodostuu Orionin tähdistön Rigelistä ja Betelgeuzesta sekä Pienen koiran Procyonista ja Ison koiran Siriuksesta.

Lähteet

Viitteet

  1. ↑ Tähdet 2012, s. 50.

Aiheesta muualla

Lyyran tähdistö (Lyra) » luettelo tähdistä, luokka
TähdetVega, γ Lyr, β Lyr, R Lyr, δ2 Lyr, κ Lyr, ζ1 Lyr, θ Lyr, η Lyr, ε2 Lyr A, ε1 Lyr A, λ Lyr, 16 Lyr, μ Lyr, 17 Lyr, ν Lyr, ι Lyr, ε2 Lyr B, δ1 Lyr, ζ2 Lyr, ν1 Lyr, 19 Lyr, XY Lyr, ε1 Lyr B, HD 178911, HD 177830, β Lyr, RR Lyr, GSC 02652-01324, β Lyr
EksoplaneetatHD 178911 b, TrES-1
Joutsenen tähdistö (Cygnus) » luettelo tähdistä, luokka
TähdetDeneb, γ Cyg, ε Cyg, δ Cyg, Albireo A, ζ Cyg, ξ Cyg, τ Cyg, ι Cyg, κ Cyg, ο1 Cyg, η Cyg, ν Cyg, ο2 Cyg, ρ Cyg, 41 Cyg, 52 Cyg, σ Cyg, π2 Cyg, 33 Cyg, υ Cyg, 39 Cyg, θ Cyg, μ1 Cyg, λ Cyg, 63 Cyg, 47 Cyg A, φ Cyg, π1 Cyg, 8 Cyg, 59 Cyg, P Cyg, 30 Cyg, 57 Cyg, 55 Cyg, 72 Cyg, 15 Cyg, ψ Cyg, 28 Cyg, 29 Cyg, T Cyg, ω1 Cyg, 22 Cyg, 2 Cyg, 17 Cyg, 20 Cyg, 68 Cyg, 74 Cyg, 26 Cyg, 56 Cyg, 75 Cyg, Albireo B, 23 Cyg, 35 Cyg, 25 Cyg, 4 Cyg, 19 Cyg, 61 Cyg A, 71 Cyg, 70 Cyg, 27 Cyg, 60 Cyg, 9 Cyg, 14 Cyg, 51 Cyg, ω2 Cyg, 49 Cyg, 36 Cyg, V389 Cyg, 40 Cyg, V380 Cyg, 79 Cyg, 7 Cyg, Gl 777, 43 Cyg, 77 Cyg, DT Cyg, 49 Cyg, 42 Cyg, 69 Cyg, W Cyg, V460 Cyg, 16 Cyg A, 11 Cyg, 61 Cyg B, 76 Cyg, μ2 Cyg, CP Cyg, 44 Cyg, 16 Cyg, 48 Cyg, X Cyg, HD 185269, HD 188753, HD 187123, χ Cyg, R Cyg, U Cyg, 47 Cyg B, Cygnus X-1, RT Cyg, V1500 Cyg, V476 Cyg, V1668 Cyg, V1974 Cyg
EksoplaneetatGl 777 c, Gl 777 b, 16 Cyg Bb, HD 185269 b, HD 188753 b, HD 187123 b, Kepler-22b, Kepler-70b, Kepler-70c, Kepler-78b
Kotkan tähdistö (Aquila) » luettelo tähdistä, luokka
TähdetAltair, γ Aql, ζ Aql, θ Aql, δ Aql, λ Aql, β Aql, η Aql, ε Aql, 12 Aql, 71 Aql, ι Aql, μ Aql, ν Aql, ξ Aql, 69 Aql, 70 Aql, κ Aql, ρ Aql, 26 Aql, 4 Aql, 36 Aql, 18 Aql, 23 Aql, 37 Aql, ο Aql, 21 Aql, 31 Aql, σ Aql, 19 Aql, 11 Aql, ω1 Aql, χ Aql A, φ Aql, FF Aql, 20 Aql, 51 Aql, 14 Aql, 15 Aql, 66 Aql, 42 Aql, 27 Aql, τ Aql, 28 Aql, 62 Ser, 22 Aql, 58 Aql, V1291 Aql, 45 Aql, 62 Aql, π Aql B, 57 Aql A, 14 Sge, π Aql, 56 Aql, 35 Aql, 5 Aql, υ Aql, 10 Aql, 64 Aql, QS Aql, ω2 Aql, 8 Aql, R Aql, V923 Aql, 68 Aql, ψ Aql, 46 Aql, V450 Aql, U Aql, V1472 Aql, V1401 Aql, 24 Aql, V Aql, V1339 Aql, 57 Aql B, TT Aql, HD 183263, HD 192263, HD 231701, V603 Aql, χ Aql B
EksoplaneetatHD 183263 b, HD 231701 b

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