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Deepsky Susceptibility Calculator
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The calculator that makes the deepsky optimal apertures studies list and chart to follow possible! |
Putting together a night's observing plan? Not sure whether you're scope and seeing
conditions will allow you to find that particular "faint fuzzy"? Want to know what
scope size is best to see it well? Or to see it at all? Then input that DSO's type,
brightness, and apparent size. Let the "math wizard of the night sky" tell you what
size scope and magnification is needed!
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Deepsky Studies by Optimal Aperture
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Don't want to run the calculations yourself? Trying to put together a observation plan? Start here! |
The real reason for the
Deepsky Susceptibility Calculator! An extensive list of numerous deepsky studies based on scope size, sorted by right ascension. Assumes that seeing conditions are reasonably transparent (local unaided limiting magnitude 5.5) and stable (7/10 - especially for globular clusters and planetary nebulae). Includes links to eyepiece impressions located on Astro.Geekjoy and elsewhere. (Shows you what can be seen by "the optimal" aperture scope.)
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Astro.Geekjoy Deep Sky Atlas
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Ever wish you could tell what size scope gives the optimal view for any particular study simply by looking at a star chart?
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Your wish is our command! Astro.Geekjoy brings you over 500 deep-sky studies hand-plotted on star charts based on right-ascension including optimal aperture. Spiral bound and in color, the atlas is available print on demand from Lulu Press. The complete deep sky starter kit, includes charts, observing logs, templates, tables, Messier list and articles written by Astro.Geekjoy's jeff Barbour.
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dblCalc Double Star Rendering Program
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OK admit it! Sometimes with double stars you really don't know what to expect...
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"Wouldn't it be nice to have a party
where the stars are perfect in the sky
and wouldn't it be nice to have the optics
to show you anything you like...
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Telescopic Limiting Magnitude Calculator
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Calculates the dimmest visible star seen without averted sight
through a given scope aperture and type.
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Sky conditions are always changing. Atmospheric transparency, seeing stability, and other factors all limit how deep you're scope can go any given night. Plug in
values based on scope and conditions - then go for it!
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Close Double Star Resolution Calculator
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Predicts whether you have a decent chance at resolving that close binary.
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Dawes limit is a crude approximation. What works for one pair of 6.5 magnitude stars through a specific 150mm achromat may not work for an eight inch SCT or newt. Disparate pairs are by far the toughest! Do the research, and plug in the data. Determine if your scope has a decent chance of resolving a particular pair, on a particular night, through a particular sky. Go ahead - prove the calculator wrong!
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Disparate Double Star Resolution Calculator
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Stars of unequal magnitude are the ultimate test of optical excellence.
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Did you know that a Zeiss 65mm refractor can resolve Delta Cygni while many an eight inch SCT goes begging? Two stars may be quite distant and yet totally unresolvable. The light of the primary can easily dominate the field of view. Only the finest optics, under superb skies can resolve the toughest disparate pairs. Use the original version of the resolution calculator to see if your scope "measures up".
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Double Star Separation Calculator
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Evaluates close double star separation values without a micrometer.
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Hey most of these doubles are true binaries and are constantly changing in
separation! Once you resolve that close pair cleanly, input scope, seeing, and
magnification data, to determine just how close it is! And, of course, why not email
AstroTalk's "dblGUTTeam " with the results. Eventually, we may even be able to do
away with those bulky micrometers!
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