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Limiting magnitude: Color Stars Outline Stars Mag Range 10 Min Star Size 0.5 Max Star Size 30 Common Names Off Bayer Auto Flamsteed Auto SAO Numbers Off PPM Numbers Off GSC Numbers Off HD Numbers Off HIP Numbers Off Yale Numbers Off Mag Labels Off Proper Motion vector: Non-Stars On Vj (Photometric band) Star saturation: Blurring: The first option is nearly self-explanatory; it provides a way to set the limit Guide goes to in drawing stars at the current level. Some caution is necessary here. If you tell Guide to draw to, say, magnitude 14 at a 180-degree field of view (level 1), it will attempt to do so. But since about 5 million stars will be drawn, it will take a long time and look very messy. The next two options affect how stars are drawn on the screen. They are best understood by trying them. When "Outline Stars" is turned on, dim stars on top of bright stars are bordered in black, making them visible. This is the method usually used in printed charts. When "Color Stars" is turned on, stars are colored by spectral type: red for cool class M stars, blue for hot type O stars, yellow for class G stars such as the Sun, and so forth. "Color Stars on" only has effect for stars for which spectral information is available (this usually means stars brighter than about magnitude 10.) The "Mag Range" and "Star Size" items let you adjust the size of the circles used to display stars. The brightest star visible in Guide (Sirius) is about five million times brighter than the dimmest star visible. This range can't be shown on the monitor. A range of 10 magnitudes (a factor of 10000) is the default, but the "Mag Range" may be set differently. Also, you can set limits as to how large or small a star can be with "Min Star Size" and "Max Star Size". Combined, these three options give you complete control over the relationship between magnitude and dot size.
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