Mlhovina Přesýpací hodiny

Mlhovina Přesýpací hodiny
Mlhovina Přesýpací hodiny na snímku HST
Mlhovina Přesýpací hodiny na snímku HST
Pozorovací údaje
(Ekvinokcium J2000,0)
Typplanetární mlhovina
ObjevitelAnnie Jump Cannonová
Rektascenze13h 39m 35s
Deklinace-67°22'51"
SouhvězdíMouchy (lat. Mus)
Zdánlivá magnituda (V)13,3[1], 12,54[1], 13,19[1], 12,61[2], 13,048 4[3], 11,554[4], 11,603[4] a 10,808[4]
Vzdálenost8 000 ly
Označení v katalozích
2MASS2MASS J13393507-6722518
IRASIRAS 13359-6707
Jiná označeníMyCn 18
(V) – měření provedena ve viditelném světle
Některá data mohou pocházet z datové položky.

Mlhovina Přesýpací hodiny (MyCn 18) je mladá planetární mlhovina ležící v souhvězdí Mouchy (Mus) na jižní obloze zhruba 8 000 světelných let od Země. Byla objevena Annie Jump Cannonovou a Margaret W. Mayallovou během jejich práce na rozšíření katalogu Henryho Drapera (katalog vznikl mezi lety 19181924). Tehdy se jevila jako slabá planetární mlhovina. Tvar přesýpacích hodin byl rozpoznán díky moderní zobrazovací technice 18. ledna 1996 na základě snímku z HST. Charakteristický tvar je dán expanzí rychlého hvězdného větru v pomaleji se rozpínajícím rostoucím oblaku, který je hustší v oblasti rovníku a řidší kolem pólu.

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Reference

V tomto článku byl použit překlad textu z článku Hourglass Nebula na anglické Wikipedii.

  1. a b c Arne Henden: VizieR Online Data Catalog: UCAC4 Catalogue (Zacharias+, 2012). červenec 2012.
  2. The DENIS database, 3rd Release. 2005.
  3. Gaia Data Release 2. 25. dubna 2018.
  4. a b c Schuyler D. Van Dyk: 2MASS All Sky Catalog of point sources. červen 2003.

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