T Coronae Borealis
This is the famous "blaze star", a recurrent Nova. It could erupt at any time, rising from magnitude 10 in a matter of hours or days, and when it does, users of this chart may well be among the first to spot it. Most of the time, at least with average binoculars, T Coronae will be invisible. If you have to use any of the comparison stars above other than 98, the faintest, it may already have started to rise, and the astronomical community should be informed, with details of your magnitude estimate and time (to the nearest minute).
The chart is adapted from the AAVSO (b) scale chart for T CrB, issued in 1986.
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