Suspected unknown Supernova Remnant imaged in Cederblad 122 in the constellation Centaurus

Description and Details: This suspected unknown SNR is located in the optical vicinity of Tycho 8994-4005 (RA 13h14mn44.39s and Dec -63deg34”51.7”) in the region of Centaurus / Crux, close to the Coalsack dark nebula and appears in my images acquired on 9 April 2026 early morning through an OIII filter for a total of 4 hours 10 minutes ( Integration of 25 images of 10 minutes single exposure.)

Imaged from a personal remote setup in the Warrumbungle National Park, Australia on 7, 8 and 9 April 2026.
Imaging was done through Hydrogen II (6h10mn imaging), Oxygen III (4h10mn imaging), and Red, Green and Blue filters, with a Zwo ASI 2600MM camera and an Astro-Physics AP130 mounted on an Astro-Physics Mach1 mount.

Nebulae are rendered as an HOO image and the stars retrieved from the RGB image.
Processing done with Pixinsight.
Cederblad 122 is a very faint and extended emission nebula located in the southern sky, in the region of Centaurus / Crux, close to the famous Coalsack dark nebula. It is part of the Cederblad catalogue, a list of diffuse nebulae compiled in 1946.
Unlike brighter nebulae, Ced 122 does not stand out easily, it blends into a dense star field and is spread over a large area of sky, making it more of a subtle glow than a defined object.

This image covers roughly one quarter of Cederblad 122 along its Northern frontier.

Imaging through an Hydrogen II filter brings out the nebulosities in the brightest parts such as RCW 75 in the bottom left of the image.

In the center of the image, a blue/green OIII nebulosity appears, typical of a Supernova Remnant, the expanding cloud of gas and dust left behind after a star explodes, sending shock waves through space.
These remnants enrich the universe with heavy elements and often form intricate, glowing structures, like here in OIII wavelength.

‍ ‍Name: Jean Yves Beninger