Object Sh2-240; Simeis 147; "Spaghetti Nebula"
Description Simeis 147 is a very large supernova remnant (about 3 degrees across in apparent diameter) that I captured here with various filters, a monochrome camera, and a camera lens with a focal length of 200mm. Very challenging and also very fun object to try with a wide field setup. It was mostly shot from my light polluted backyard in Newark, DE. Tone mapped following J-P Metsavainio's procedure. The OIII signal was stronger than I thought, but tricky to incorporate.
Rights Statement This image is licensed for use under a Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0). If you use this image elsewhere, you must provide an attribution (credit line) like this:
Sh2-240 by is licensed under a CC BY-SA 4.0 License.
Acquisition Dates 2018-01-05, 2018-01-06, 2018-01-09, 2018-01-13, 2018-01-18, 2018-01-25, 2018-02-02, 2018-02-05, 2018-02-08, 2018-02-12
Date Published 2018-02-20
Locations Mostly Backyard, Newark, DE. Some OIII data captured at ChesLen Preserve in Chester Co., PA.
Optics Canon EF 200mm f/2.8L II USM; f/2.8 for narrowband; f/4.5 for broadband
Mount Orion Atlas EQ-G
Camera ZWO ASI-1600 MM-Cool (v3)
Filters Astrodon Ha (5nm), OIII (3nm), RGB (E-series)
Guiding QHY 5Lii Mono and Orion 50mm guidescope
Gain 200 for narrowband, 75 for broadband
Cooling -25C
Integration Total: 18.7 hours; Ha: 68x300" and 33x600"; OIII: 36x600"; R: 40x45", G: 40x45"; B:40x45"
Software Mount Control: EQMOD; Planetarium: Cartes Du Ciel; Acuisition: Sequence Generator Pro; Guiding: PHD2; Polar Alignment: QHY Polemaster; Processing: PixInsight 1.8.5 and Photoshop CS6
RA/DEC Center 85.252 degrees; 27.968 degrees
Orientation (E of N) 82.018 degrees
Awards Astrobin Image of the Day, April 15, 2018; Astro Imaging Channel Image of the Week, March 4, 2018
Links Astrobin; WorldWideTelescope
sh2-240 in the WorldWideTelescope screenshot