14th AprilMoon Using OIII filterSupernova in M82 Magnitude recorded as 12.757 A bright Moon (pictured above) introduced errors. April 18th I realised that I had determined the magnitude without adjusting the measuring circle to fit the size of the supernova. This would have introduced an error. A recalculation gave the magnitude as 12.928 18th April M82 supernova. This time I only used reference stars with magnitudes close to that of the supernova. I also reworked the data from 14th April. The magnitude was 13.200 The Moon rose quite late so I grabbed some luminance frames of M101 6x 10 minutes |