POSS-II / PALOMAR OBSERVATORY / CALTECH / STSCI GHOSTLY REMAINS The faintest trace of nebulosity on the eastern and northwestern area of the supernova can be seen on the POSS-II red chemical plates taken with the Palomar Observatory's 48-inch Samuel Oschin telescope. Hunting the Remnant To my knowledge, there were no published visual sightings of B Cas by amateur astronomers prior to 2006. With an extremely low surface brightness, B Cas is a ghostly shell that spans about 20 light-years, or 8′ visually. Techniques for observing SNRs are similar to those for ultra-dim galaxies. SNR possess emission lines, but most of the fainter ones don't respond to fi lters. In March 2015 Myung Gyoon Lee (Seoul National Univer- sity) et al. published a study on SNRs in M81, demonstrating that nearly all of their spectra showed O III lines at 5007 angstroms, but the lines were significantly weaker than those found in planetary nebulae. The Hα emission lines were much stronger, but these are most useful for imaging. (One exception to fi lter enhancement would be the Veil Nebula in Cygnus, the view of which is markedly improved with an O III filter.) I couldn't count on filters enhancing the view of B Cas for me. To aid my search, I made finder charts accompanied by images from the Second Palomar Sky Survey (POSSII) red plates as well as those from the results van den Bergh published in the Astrophysical Journal (1971). The eastern and northwestern areas of the SNR are faintly Sk yandTelescope.com June 2016 29http://www.SkyandTelescope.com