M81 (Alan Ćatović)

M81

Lokacija snimanja: Sarajevo, Stup

Oprema: NEQ6, C8, Atik 383L+mono

Vođenje: QHY-5II, PHD

Ekspozicija: 40x30s + 40x120s

Obrada: Pixinsight, Photoshop

Galaksija M81 je spiralna galaksija u sazviježđu Veliki medvjed. Oko 11,8 miliona svj. godina je udaljena od nas, velikih je dimenzija i aktivne jezgre. M81 je popularna galaksija za proučavanje. To je jedan od najboljih primjera spiralne galaksije. Njeni krakovi se spiralno pružaju gotovo savršeno do samog centra. Prividni prečnik M81 je 26.9′ x 14.1′ što odgovara linearnom prečniku od 94000 svj. godina. Svojim dimenzijama M81 je tek neznatno manja od naše Mliječne staze. M81 je treća najsjajnija galaksija na sjevernom nebu. Od nje su sjajnije samo Andromeda (M31) i Trougao (M33).

Dosad je samo jedna supernova otkrivena u M81. 28. marta 1993. otkrivena je SN 1993J, tip IIb supernove. SN 1993J je bila druga najsjajnija supernova poslije SN 1987A i dosegla je prividni sjaj od +10,5 magnituda. Iz promatranja eksplozije supernove izračunata je udaljenost od M81 od 8,5 ± 1,3 miliona svj. godina.

M81 je najveća galaksija u grupi galaksija M81. Grupa se sastoji od 34 galaksije, smještene u sazviježđu Veliki medvjed. To je jedna od najbližih grupa galaksija našoj Lokalnoj grupi.

M81 je iskusila gravitacijsku interakciju sa M82 i NGC 3077. Interakcije su uzrokovale gubitak vodika u sve tri galaksije te su uzrokovale stvaranje vlaknastih struktura u grupi. Interakcije su uzrokovale i pad međuzvjezdanog plina u središte M82 i NGC 3077. Pad je uzrokovao nagli rast intenziteta stvaranja zvijezda u tim galaksijama.

M81 je lako vidljiva u bilo kojem optičkom uređaju. Dvogledom je moguće vidjeti kao sjajan oblačić. U teleskopima oblačić pokazuje jasnu eliptičnost, jezgru i pad svjetline prema rubovima. Za uočavanje spirale potreban je teleskop prečnika većeg do 300 mm.

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Deep sky
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	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
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Professional, scientific grade data
Mix of multiple sources
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Status	Basic success
Started	...
Astrometry.net job	3273397
PixInsight job	n/a
PixInsight queue size	n/a
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