Image Description and Details : The "Cocoon" nebula is aptly named: it is a magnificent nursery of stars, located about 3500 light-years away in the constellation Cygnus. The "Cocoon" is home to a small open cluster (called "Collinder 470") that reveals about 20 stars. If it does not have the generous apparent dimensions of other well-known star-forming places, such as the Orion or Lagoon nebulae, the Cocoon nebula is nevertheless the seat of a sustained activity of star creation, the great majority of which are actually hidden behind the dark dust bands. The Cocoon Nebula also has a "bluish" zone around the edge of the ionized zone, which does not result from the same physical mechanism. In this zone, the light does not result from the absorption of stellar radiation by the gas and its re-emission at a lower energy (red zones), but from a simpler "reflection" of the light by the surrounding dust clouds. Takahashi TSA102 - AZEQ6 - Atik 16200MM Filters Baader LGRB-Ha (3,5nm) L : 62 x 900s bin1 Ha : 37 x 900s bin1 + 20 x 600s bin2 RGB : 108 x 300s bin2 Processing: Pixinsight & Photoshop (8 nuits) Corse & Fouras (17).

Copyright: Jean-Baptiste Auroux

Image Description and Details :

Here is a mosaic of 2 images with the main galaxies of the group NGC 4725 (located at about 55 million light-years) and the planetary nebula LoTr5, discovered in 1980 and located "only" at 1650 light-years from us!
The small galaxy NGC 4712, to the right of NGC 4725, is located more than 200 million light-years away.

A beautiful "cosmic perspective" with these different objects!

Mosaic of 2 images in LRGB + OIII. !

The framing of the first image was not intended for a mosaic with the nebula field, so an important part of the final field had to be cropped. The difference in sky quality resulted in a poor homogeneity of the sky background and a difficult connection between the two images, which did not facilitate the processing of this one.

A lot of time spent on processing to achieve a homogeneous result and highlight the nebula.

LRGB+OIII version
TSA102 - AtikOne6.0 - AZEQ6
L : 32 x 600s bin 1
RGB : 72 x 300s bin2
OIII : 18 x 600s bin2
Total : 14h20

Copyright: Jean-Baptiste Auroux