StDr 33
This first colour image of the probable planetary nebula StDr33 (PNG 201.6+03.9) shows a bright ring-shaped structure surrounding a whitish central star.
The central star is probably a close binary system in which two stars orbit each other. This is likely also the reason why the central star does not have the typical blue colour, as the spectral colours of both stars mix to a white-yellow.
Picture




TARGET
Nomenclature:  StDr 33
Right Ascension: 06:44:52.15
Declination: +11:49:08.30
Size: 2.1 x 0.6 arc minutes
Discovery: Xavier Strottner and Marcel Drechsler

EQUIPMENT USED
Twin APM TMB LZOS 152 refractors, Celestron EdgeHD 14"
10Micron GM2000 HPS mount, 10Microm GM3000 HPS mount
Twin QSI6120 CCD cameras, ZWO ASI6200MM Pro camera
IMAGE CAPTURE
Ha 5nm: 109x900" bin 1x1, 249x600" bin 1x1
OIII 3nm: 94x900" bin 1x1
Red: 27x300" bin 1x1
Green: 29x300" bin 1x1
Blue: 30x300" bin 1x1
Total integration: 99 hours 25 minutes
Pixel scale: 0.531 arcsec/pixel
Field radius: 0.377 degrees
Capture dates: 18 December 2022 - 6 January 2023
Capture location:  Fregenal de la Sierra, Spain
IMAGE PROCESSING
Pre-processing: Pixinsight, CCDStack2
Post-processing: Pixinsight, Photoshop CS2