Oktantti Tietoja Oktantti-tähdistöstä | Oktantin tähdistön kirkkaita tähtiä | NavigointivalikkoInfobox OKlaajentamalla

Oktantin tähdistö


tähdistötähtikuviodeklinaatioPohjantähteennapatähteäSigma Octantisnäennäinen kirkkausspektriluokkajättiläistähtiEtelän ristiν Octβ Octδ Octθ Octε Octγ1 Octα Octλ Octγ3 Octχ Octξ Octζ Octι Octσ Octφ Octψ Octτ Octκ Octρ Octπ1 Octπ2 Octγ2 Octυ Octω Octμ1 Octη Octμ2 Oct





Tämä artikkeli käsittelee Oktantti-tähdistöä. Saman nimistä mittalaitetta käsittelee artikkeli Oktantti (mittalaite).
























Oktantti
Octans constellation map.png

Latinankielinen
nimi
Octans
Lyhenne
Oct
Genetiivi
Octantis
Rektaskensio
22h
Deklinaatio
-90°

Ala taivaasta
291 neliöastetta
Tähtien määrä
(magnitudi < 3)
0
Kirkkain tähti
Nu Octantis (3,73 mag.)
Meteoriparvet
ei
Naapuri-
tähdistöt
  • Tukaani

  • Intiaani

  • Riikinkukko

  • Paratiisilintu

  • Kameleontti

  • Pöytävuori

  • Etelän vesikäärme


Näkyy leveysasteiden +0° ja −90° välillä


Infobox OK

Oktantti (latinaksi Octans, Octantis, Oct) on eteläisen tähtitaivaan eteläisin tähdistö. Tämä tähtikuvio on keskisuuri ja himmeätähtinen. Taivaan etelänapa, deklinaatio −90° sijaitsee juuri Oktantin tähtikuviossa. Etelässä ei ole Pohjantähteen verrattavaa napatähteä, vaan ainoastaan hyvin himmeä
Sigma Octantis (lyhenne σ Oct) on melko lähellä etelänapaa. Sen deklinaatio on
−88° 57′ eli se sijaitsee hieman yli asteen päässä navasta. Sigma Octantiksen ("Polaris Australis, eteläinen napatähti") näennäinen kirkkaus on vain 5,42.
Sigma Octantiksen spektriluokka on F0III ja etäisyys 270 valovuotta. Se on siis kohtalaisen kaukana oleva kellanvalkea jättiläistähti, jonka kirkkaus vaihtelee.
Etelän risti osoittaa kohti taivaan etelänapaa ja on etelänavan paikannin eteläisellä pallonpuoliskolla.



Tietoja Oktantti-tähdistöstä |


  • näkyy päiväntasaajalta -90° leveysasteelle


  • deklinaatio -90°, taivaan etelänavalla

  • 291 neliöastetta, järjestyksessä 50:s


Oktantin tähdistön kirkkaita tähtiä |


Nimetty eteläinen napatähti:


  • (σ Oct) 5.45 Polaris Australis

Tähtiä bayerin nimillä:



α Oct 5.13; β Oct 4.13; γ1 Oct 5.10; γ2 Oct 5.72; γ3 Oct 5.29; δ Oct 4.31; ε Oct 5.09; ζ Oct 5.43; θ Oct 4.78; η Oct 6.19; ι Oct 5.45; κ Oct 5.56; λ Oct 5.27; μ1 Oct 5.99; μ2 Oct 6.51; ν Oct 3.73; ξ Oct 5.32; π1 Oct 5.65; π2 Oct 5.65; ρ Oct 5.57; τ Oct 5.50; υ Oct 5.76; χ Oct 5.29; φ Oct 5.47; ψ Oct 5.49; ω Oct 5.88





Oktantin tähdistö (Octans) » luettelo tähdistä, luokka







Tähdet

ν Oct, β Oct, δ Oct, θ Oct, ε Oct, γ1 Oct, α Oct, λ Oct, γ3 Oct, χ Oct, ξ Oct, ζ Oct, ι Oct, σ Oct, φ Oct, ψ Oct, τ Oct, κ Oct, ρ Oct, π1 Oct, π2 Oct, γ2 Oct, υ Oct, ω Oct, μ1 Oct, η Oct, μ2 Oct


Eksoplaneetat




Tähdistöt




Ajokoirat | Ajomies | Alttari | Andromeda | Bereniken hiukset | Delfiini | Eridanus | Etelän kala | Etelän kolmio | Etelän kruunu | Etelän risti | Etelän vesikäärme | Feeniks | Harppi | Heilurikello | Herkules | Härkä | Ilmapumppu | Ilves | Intiaani | Iso karhu | Iso koira | Jousimies | Joutsen | Jänis | Kaksoset | Kalat | Kameleontti | Karhunvartija | Kassiopeia | Kaukoputki | Kauris | Kefeus | Kentauri | Kettu | Kilpi | Kirahvi | Kolmio | Kompassi | Korppi | Kotka | Krapu | Kulmaviivoitin | Kultakala | Kurki | Kuvanveistäjä | Kyyhkynen | Kärpänen | Käärme | Käärmeenkantaja | Köli | Leijona | Lentokala | Lohikäärme | Lyyra | Maalari | Malja | Mikroskooppi | Neitsyt | Nuoli | Oinas | Oktantti | Orion | Paratiisilintu | Pegasus | Perseus | Peräkeula | Pieni hevonen | Pieni karhu | Pieni koira | Pieni leijona | Pohjan kruunu | Purje | Pöytävuori | Riikinkukko | Sekstantti | Sisilisko | Skorpioni | Sulatusuuni | Susi | Tukaani | Vaaka | Valaskala | Veistotaltta | Verkko | Vesikäärme | Vesimies | Yksisarvinen



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