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Melotte 15 - Core of Cluster IC1805 in Cassiopeia

RA = 2 hrs 32 min; Dec = +61 deg 27 min

Date & Site:

Imaged on 9/24/2012 ; Running Man Observatory, Carlsbad, CA

Conditions: clear, very good seeing, average transparency


Telescope: Celestron C9.25 at F6.3 fl=1480mm

Mount: Losmandy G-11 with Gemini; Antares .63 reducer
Camera: ST-10XME; CFW10 with Astrodon filters

Externally guided through an 80mm achromatic refractor


Exposures: Ha (6nm) 18 x 10 min (total =3 hrs)

Imaged from my backyard observatory over two nights during brief periods of clear skies and very good seeing.

FOV = 20 x 18 arc minutes

This region lies at the core of the large emission nebula in Cassiopeia known as IC 1805 or the Heart Nebula). Named after the British-Belgian astronomer Philibert Jacques Melotte (1880-1961), Melotte 15 is an extremely young cluster of massive OB stars with a mean age of only 1.5 million years. It is one of the core clusters of the Cas OB6 association and contains several O type giants with more than 15 solar masses.

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