I have now finalized this 3-panel RASA8 mosaic (totalling 33 hours) of this rarely imaged SNR first catalogued by radio astronomer as HB3, but also known as G132.7+1.3. When adding the final left panel I wanted to catch as much as possible of the nebulosity north of the Heart Nebula rather than getting the whole Heart Nebula, as there in no lack of images of that one.
The project started when I thought I saw some interesting structures in the area just west (to the right) of the Heart Nebula on Aladin Sky Atlas and decided to give it a try with my dual-RASA8 rig. First night I collected RGB data and it looked a bit tame, so I decided to spend a night collecting Ha and Oiii using the NBZ filter (78x5min). Duing processing I realized there was something there resembling the Spagetti Nebula, so a large Supernova remnant. Searching the net revealed that the first image showing the Oiii structures of HB3 was posted less than a month ago as a preprint on arXiv (
https://arxiv.org/abs/2202.07749v1). Thus, mine is possibly the second one ever posted revealing this faint but clear Oiii signal in the shock waves.
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