October
2nd No Moon and good clear sky. Patrol imaging of M31 showed no bright new objects but after several 600s images were stacked and subtracted from the reference image - a dim new object was seen. The usual checks of PanSTARRS, DSS and SIMBAD plus minor planet centre showed no objects at that position. I checked TNS, TCOP and previous nova records - nothing showed up. A report was sent to TNS and the object was given the designation AT 2019 rsi The subtraction image: We now wait to see if a confirmation spectrum can be obtained. 3rd October This compares the field taken with the 8 metre Subaru telescope with my image - clearly there is no star at that point: October 9th Nova AT 2019rsi somewhat brighter at 17.2: The TESS space telescope has surveyed the region and produced some photometry and an updated position. Previous RA, DEC: 00:42:23.520, +41:11:52.80 ….. my discovery coordinates Updated RA, DEC: 00:42:23.529, +41:11:52.22 … TES coordinates Some background on the space telescope TESS Wikipedia YouTube October 16th A bright moon rose quite early so image quality was hampered. Initial survey of M31 showed no new objects, but stacking 5 x 600 second images showed a very dim blob on using the subtraction method. Further investigation and lots of image enhancement showed a distinct object: Minorplanets, Panstarrs, DSS, Simbad and Subaru searches showed no objects. Subaru 8 metre scope image: I contacted Kamil Hornoch in the Czech Republic. He confirmed the existence of the object. After further searches of archive images, ATEL#13198 was published. Kamil's image: October 21st AT 2019rsi has faded out of sight for my small 20cm scope. I had given up hope of a confirmatory spectrum, but this ATEL came through today. October 30th There was a TNS announcement about a suspected nova in M31, AT 2019tsc I looked through my images from the 29th October - sure enough, it was faintly visible. Magnitude was around 19.5 which is at the limit for my equipment. Stack of 9 x 600 seconds Subtracted from the reference image. AT 2019rsi still quite bright! Astrometrica gives m=19.4 |