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Open Cluster M38

Open Cluster M38
It was discovered by Giovanni Batista Hodierna before 1654 and independently found by Le Gentil in 1749. M36 and M37, also discovered by Hodierna, are grouped together with M38 at a distance of about 3,420 light years away from Earth.[1] The cluster's brightest stars form a pattern resembling the Greek letter Pi or, according to Webb, an "oblique cross." At its distance of 4,200 light years, its angular diameter of about 20' corresponds to about 25 light years, similar to that of its more distant neighbor M37. It is of intermediate age (about 220 million years, according to Sky Catalog 2000) and features a yellow giant of apparent magnitude +7.9 and spectral type G0 as its brightest member. This corresponds to an absolute magnitude of -1.5, or a luminosity of 900 suns. For comparison, the Sun would appear as a faint magnitude +15.3 star from the distance of M38.

Zdjecie prezentuje zasadniczo gromade otwarta M38. Odkryl ja Giovanni Batista Hodiern'a przed 1654 i niezaleznie pózniej Le Gentil w 1749. M36 i M37, takze odkryte przez Hodierna, zgrupowane sa z M38 w odleglosci okolo 3420 lat swietlnych od Ziemi. Najjasniejsza gwiazda gromady jest zólty olbrzym o jasnosci +7.9 i widmie G0. Odpowiada to jasnosci absolutnej -1,5 lub inaczej ma on jasnosc 900 slonc !. Dla porównania, nasze slonce wydawalo by sie dla obserwatora przebywajacego gdzies w ukladzie M38 slaba gwiazdka +15.3 mag. Gromada i otoczenie ta to wspanialy obiekt na kilkuminutowe kontemplacje przy okularze

Photo Details

  Telescope: FSQ106EDX (530 mm) Takahashi

  Camera: Sbig ST-2000XM, Filter wheel, Baader 1.25" LRGB filtes

  Mount: NJP Takahashi

  Guiding: Self-guided

  Exposure: LRGB 10:9:9:9

  When: October 2010

  Other information: LP area

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