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Bubble mosaic: 4 Cas region including the Bubble Nebula, Salt & Pepper Cluster, Lobster Claw, Northern Lagoon, IC470 and Nova Cass 2021

Padraic M

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A clear spell on 23/24/25 July gave an opportunity to capture a mosaic of a very rich area of Cassiopeia.


This is a 2x1 panel mosaic in HaRGB which includes the following objects:

- Messier 52 Salt and Pepper Nebula, an open cluster discovered by Charles Messier on 1774.
- Caldwell 11 Bubble Nebula, an emission nebula surrounding a mag 8.7 star, which while it looks like a planetary nebula is actually a bubble blown by the star's stellar winds in the surrounding gas cloud. The bubble is 6 light years in diameter, and is at a distance of approximately 7,000 light years. It was discovered by William Herschel in 1787.
- Nova Cassiopeiae 2021, first eruption identified on 18th March and a number of flare-ups observed since. Imaged at mag 6.9 here and has since faded to mag 7.12.
- NGC7538 Northern Lagoon Nebula 
- Sharpless 2-157 Lobster Claw Nebula, emission nebula, which contains:
- -- Markarian 50 open star cluster
- -- Lynds' Bright Nebula (LBN) 537, from a catalog of bright nebulae compiled by Beverly Turner Lynds, a Professor of Astronomy at the University of Arizona, from a study of the red and blue prints of the National Geographic-Palomar Observatory Sky Atlas, and pubished in the Astrophysical Journal Supplement, vol. 12, p.163, 1965.
- -- Planetary Nebula PLN 110-0.1 (also WeSb 6 from the Galactic Planetary Nebulae catalog)
- NGC 7510 Dormouse cluster in Cepheus
- IC1470 H ii ionized region (emission nebula). "IC 1470 has a nebular spectrum similar to M8 and appears to be an H ii region excited by a single 07 star. It represents an object formed close to the edge of a molecular cloud, and its ionizing radiation is penetrating
the intercloud gas, producing a “blister” on its edge." (Lynds, B. T. ; Oneil, E. J., Jr.,  An optical study of IC 1470, Astrophysical Journal, Vol. 265, p. 803-807 (1983))


The image is processed HaRGB, and comprises two panels.

Panel 1:
Red 9x300, 2x600
Green 9x300, 2x600
Blue 9x300, 2x600
Ha 12x300


Panel 2:
Red 9x300
Green 9x300
Blue 9x300
Ha 9x300


Total integration 7hrs 40mins, Bortle 2.


Imaging: SW Esprit 80; ZWO ASI1600mm Pro @ -20c gain 139 offset 21; Baader RGB and 3.5nm Ha filters. Capture controlled by NINA.
Guiding: AA Starwave 50mm; ZWO ASI290mm Mini; PHD2
HEQ5 Pro belt mod; Sesto Senso 2 focuser; ZWO EFW Mini.
Processed with Astro Pixel Processor, Gimp, Noise Ninja.




High resolution on Astrobin.




Edited by Padraic M
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