This map locates double stars in the northern and eastern sky. Click to enlarge.
“The sky is broken. For weeks now, Western and Canadian wildfires have released a pall of smoke that blankets both countries. July 8th was the last smoke-free night at my observing site in northeastern Minnesota. Daytime skies are generally pale blue, with nights starved of stars. Often, the limiting magnitude is 2 or 3. For many, smoke from wildfires has transformed summer nights, blotting out stars and familiar deep-sky sights. But through it all, double stars keep on shining. Because of constant smoke I've had to change up my observing from comets and deep-sky to brighter fare. Among the astronomical objects least affected by wildfires and haze are double stars. ...”
Stars are classified into spectral types according to temperature and the elements and molecules that dominate their spectra.
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