Citizen Sky is now officially permanent part of the AAVSO. In the coming weeks we will be moving additional content to the AAVSO site and freezing this site as an archive of the 1st three years of the project. Please visit the new landing page for future updates.
Hello,I have just posted a response to a question on the Visual Observing Forum, 'Avoiding Bias: a Few More Rules for Variable Star Observers'. Alex Burda suggests that the use of comparison star magnitudes as labels, as on AAVSO charts, might bias results in some way. British Astronomical Association Variable Star Section charts which I use label stars with letters, and only list their apparent magnitudes at the bottom of the chart. This isn't something I have thought about before, but lacking any evidence either way I'm inclined to agree with Alex. What do others think?Secondly, the BAA chart for eps Aur gives comparisons closer in apparent magnitude to eps Aur than does the AAVSO chart, but further away on the sky (eg eps Per differs in RA by about an hour). What might be the different errors introduced by these two factors?David.