Padraic M Posted July 30, 2021 Share Posted July 30, 2021 (edited) 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. Equipment 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. Annotated: Edited July 30, 2021 by Padraic M 6 Quote Link to comment Share on other sites More sharing options...
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