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IC1805 sent on February 01, 2025 (16:48) by Framoro. 0 comments, 77 views. Posa B f/5.0,
C 1805 (also known as the Heart Nebula) is a diffuse nebula in association with an open cluster, visible in the constellation of Cassiopeia, towards the border with the Giraffe. This is a very large HII region, whose distance is estimated at 7500 light years from us; its main characteristic is the presence of two large apparently empty areas of different sizes, which make the nebula similar to a "heart". Inside there is a system of small, poorly concentrated open clusters, responsible for the ionization of the nebula. The most notable of these is Melotte 15, which contains some stars about 50 times more massive than the Sun, plus smaller ones and a microquasar ejected millions of years ago.
The Heart Nebula has a shell structure; at its center is the open cluster IC 1805, a designation with which the entire nebula associated with it is sometimes also indicated. The brightest stars in the cluster are blue dwarfs, 24 of which have a mass greater than 10 M?, with an age between 1 and 3 million years.
Multiple episodes of star formation are active near the nebula. From this region emerge over 30 molecular clouds and globules dispersed in the surrounding space, the presence of which suggests that once in the region there was a giant molecular cloud which later dissolved due to a first intense episode of star formation.
Camera: ZWO ASI2600MC Pro
Lens: TS Optics Photoline 70/420
Focal reducer 0.79x
Mount: SW AzEq5
Lights: 170x300 sec.; darks, flats, flat darks
Filter: IDAS NBZ 2"
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