Monday's moon:
Tuesday's moon:
The progression of sunlight over three days, Clavius crater:
The progression of sunlight, Plato crater:
Mizar and Alcor in the handle of the "Big Dipper" form a naked-eye double star that resolves into three apparent stars in small telescopes. A spectrum for each star can be obtained simultaneously with a diffraction grating:
The rainbow spectrum for Mizar (top star) consists of two closely spaced spectra corresponding to each component (Mizar A and Mizar B). All three stars, Mizar A,B and Alcor are classified as A-type main sequence stars. All exhibit strong hydrogen absorption lines, which are evident in the picture above and more clearly seen in the intensity plot below:
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The red-dash lines mark the wavelengths of the hydrogen-Balmer series. |
All images were obtained with an Orion 80mm ED f/7.5 refractor.
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