ariable star observers use standardised star charts to estimate stellar brightness, for many reasons. For one, it gives consistent measures. And secondly, if the sequence of comparison star magnitudes used, while investigating discordant observations of Eta Carinae. In 1972, Walker and Marino classified it as an Algol-type eclipsing binary that ranged from magnitude 6.2 to 6.49 over a period of almost exactly six days. So, give it its own observing program and the case would be closed. Or would it?
