Supernova Remnant SNR G119.5+10.2, CTA 1

Supernova Remnant SNR G119.5+10.2, CTA 1

CLICK ON IMAGE FOR FULL SIZE VIEW (6203x4136)

Scope: AT60EDP at f/5, Location: DAA Observatory, Shelter Valley, CA; Dates: 13, 26, 27 August, 3, 4 September, 2024; Camera: ASI2600MM (Astronomik type 2c LRGB, 6 nm Ha and OIII filters)

Exposure: Exposure: Ha - 140 x 6 min (gain-160 1x1), OIII - 139 x 6 min (gain-160 1x1), Lum - 88 x 3 min (gain-101 1x1), RGB - 36 x 2 min (gain-101 1x1) each RGB exposures.

Processing: Data Collection - N.I.N.A. Sequencer (as FITs). Sub-frame calibration - Pixinsight (WBPP). Sub-frame registration and integration (Average combine - linear fit clipping) - PixInsight (WBPP). 2x Drizzle of Lum, Ha, and OIII - PixInsight (WBPP). Noise reduction - NoiseXTerminator - PixInsight. Non-linear stretching, normalization and gradient removal - PixInsight. Photometric RGB calibration (SPCC) - PixInsight. Deconvolution of Lum, Ha, OIII, and RGB stacks - BlurXTerminator. Generation of starless nebulosity Lum, Ha, OIII , and RGB images for later processing - StarXTerminator. Curves, Levels, RGB combine - PixInsight. RGB Stars and starless combine - PixInsight. Final finishing - Affinity Photo. Annotation - PixInsight, Aladin (Simbad ), and Affinity Photo. This image is a modified HOO Narrow Band and screened Lum starless construction - with RGB stars added. Image processed at 12496x8352 resolution (2x drizzle). Final Image size is approximately 6203x4136.

North is up in this image. SNR G119.5+10.2 (also known as CTA 1) is a supernova remnant. It is in a field that includes dust and molecular clouds. The energy released by the supernova expands outward and ionizes surrounding gas. In this case the blue is an Oxygen three emission and the red is Hydrogen alpha emission. The emission line and dust reflection light is extremely faint and require hours of imaging exposure. The supernova event is estimated to be about 14,000 years ago with the age of the shell about 13,000 years. It distance ranges from 3,600 to 5,500 light years .

Also in the 'Full Size View' image are two small planetary nebulae - one, NGC 40, is possibly mingled with or just outside the supernova remnant. NGC 40 is about 5,800 light years distant. The second (designated as 'likely') planetary is HU 2 (also known as PN G121.7+11.4) - it was only 'discovered' in 2016. There are two open star clusters, CWNU 541 and NGC 7708, the latter is seemingly not a true open cluster, but more just a grouping of stars. Some of the molecular cloud structures are identified in the Planck Galactic Cold Clump catalog (PGCC). These objects and some of the brighter stars are identified in the annotated image.

Horizontal FOV is approximately 4.44 degrees. Full size image scale is about 2.57 arcsec/pix.

Image center is approximately - Equatorial 2000: RA: 00h 04m 58s Dec: +73°01'10"

All images and content remain the property of Jim Thommes - copyright 2003 - 2024

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