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A few changes to Endeavour recently:
First, I've rearranged the "Chart Labels" into a more compact arrangement. Related options (like those for chart-level settings, or star labels, or deep-sky object labels) are in the same columns. This should make it a little easier to keep track of option settings with similar functions.
Second, there's now a "Variables" label option. Enable it, and any Hipparcos variables with a major variable star designation (approximately 6,000 stars in the database) will be highlighted with a circle around the star symbol, just as in most star atlases. Their star label will also appear, regardless of any other settings. "Variables" mode is enabled by default in all Atlas Levels of 7 and up, as well as the "deeper" classic star atlas modes such as Uranometria and Millennium Star Atlas.
(On a somewhat technical note: "major variable star designation" basically means a traditional Bayer or Flamsteed ID (such as δ Cep), a classic one- or two-letter ID (such as R CrB or RR Lyr) or a "V" ID (such as V450 Aql). Stars with only a "NSV" (New Catalogue of Suspected Variable Stars) designation have not been included.)
Third, when your chart location is the Sun or very close to it, the HUD for a variable star will contain an estimate of the star's magnitude range. This estimate is based on the 5% and 95% percentile brightnesses measured by Hipparcos, which performed its observations over a 4 year time frame. As a result, many long-period or irregular variables were not sampled over their entire range, and some very wide-ranging variables could not be measured accurately at their minimum. Thus the variable range shown in Endeavour is smaller than the actual range for some stars, which will actually have somewhat brighter maxima or fainter minima than what Hipparcos was able to observe.