Supernova (candidate) discovered on December 13, 2017 in NGC841
December 17, 2017
I expected an easy target, since it seems that the first reported observation reported a magnitude around 17.0
The fact is that after downloading the first image I realized that in the position where supernova should be, apparently nothing was visible ... another false positive? Two in a week ... strange, so I started to collect shots and stretch and stretch image histogram, and... wow! something appears, but far from magnitude 17 :)
It is very difficult to observe, but if we look closely, there it is, a weak star:
According to my calculations, around magnitude 20.64, a real surprise, not too bad for my sky, close to Madrid city.
AT2017ixb.fits 2458105.36670 20171217.86670 Clear V-band C UCAC4 638:7671 118237 15.05 27.79 V AT2017IXB 701 20.64
December 22, 2017
After several days following this supposed supernova, it is not clear to me at all if it is or once was a real supernova.
It seems that is harder to detect something these dayst and it has not been possible for me to make a reliable measurement at all...