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Mel 15


Melotte 15 in Cassiopeia

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

Date & Site:

Imaged on 09/24/13; Runningman Observatory, Carlsbad, CA

Clear; average seeing ; average transparency


Telescope: TEC 140 f/7 refractor (fl 980mm)

Mount: Losmandy G-11 with Gemini
Camera: ST-10XME; CFW10 with 3 nm Astrodon filters;

Hutech Off-Axis Guider


Exposures: 120 min of Ha; 90 min each OIII and SII for a total of 5 hrs

Color mapped using the Hubble Palette by assigning SII to Red, OIII to Blue, and Ha to Green.

FOV = 35 x 52 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.

Imaged on my birthday - a gift from the Queen (Cassiopeia)

7500 light years away

Reduced to 65% of original size

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