Abell 13
Awarded Astronomical Picture Of The Day 2 January 2022 by astronomia.com  apod.astronomia.com/2022/01/02/abell-13-la-nebulosa-anello-di-orione/?fbclid=IwAR3D1PduzQrIfkv9DEuitOGKSERyMol0vIXsKBde09f-7Zd2Ax8Sx6L4nM4
Awarded for Amateur Astronomy Picture Of The Day 10 January 2022 www.aapod2.com/blog/abell-13
Abell 13 is highly evolved planetary nebula in Orion. It is sometimes known as the Orion Ring Nebula because it's morphology resembles the better known Ring Nebula, M57. However Abell 13 is much fainter at around mag 16. In both cases their oval shape is believed to be a result of them being bipolar nebulae viewed offset from their axis, making their ring structure appear oval. Abell 13 is 2.9 arc minutes in angular size and around 3,500 light years away. It was first catalogued as Abell 9 by George Abell in 1955, but renumbered as Abell 13 in his 1966 paper.
TARGET
Nomenclature: Abell 13
Right Ascension: 06:04:47.9
Declination:  +03.56.35.77
Size: 17.0 arc secs
Discovery: unknown
EQUIPMENT USED
Twin APM TMB LZOS 152 refractors
10Micron GM2000 HPS mount
Twin QSI6120 CCD cameras
Astrodon filters
IMAGE CAPTURE
Blue: 16x300"
Green: 18x300"
Red: 18x300"
Ha: 195x900" bin 1x1
Total Integration: 53 hours 5 minutes
Pixel scale: 0.266 arcsec/pixel
Field radius: 0.171 degrees
Capture dates: 13-29 December 2021
Capture location:  Fregenal de la Sierra, Spain

IMAGE PROCESSING:
CCDStack and Photoshop CS2