Title: IC 1805 - HEART NEBULA - HA-O3-RGB
Description:
IC 1805 – HEART NEBULA
IC 1805 also called the Heart Nebula, or with the acronym W4, is a diffuse nebula located in the constellation of Cassiopeia, towards the border with the constellation Giraffe.
It is located at a distance from Earth of about 7,500 light years and has an absolute magnitude of 6.5.
Apparent diameter of 150'.
IC 1805 is actually the open cluster located at the center of this nebula, whose brightest stars in the center are blue dwarfs.
The most important of these open clusters is known as “Melotte 15” or “Collinder 26”, whose brightest stars are blue dwarfs, 24 of which have a mass greater than 10 solar masses, with an age between 1 and 3 million years.
The Melotte Catalog includes 245 deep sky objects, located on both hemispheres, in particular open and globular clusters. It was compiled in 1915 by the astronomer Philibert Jacques Melotte. The large quantity of hydrogen present in the area contributed significantly to the birth of this star cluster, a few million years ago.
Star formation processes and very dense areas of ionized hydrogen Ha are active around the nebula.
The main characteristic of this nebula is the presence of two large apparently empty areas, of different sizes, which make the nebula similar to a "heart".
The nebula is essentially composed of SII, Ha and OIII, gases ionized by the stellar winds of the stars present within it.
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