Star Cross Light
Posted on Wednesday, October 14, 2009 in Photography
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What are those perpendicular lines in photos of stars called and why are they there?
In astronomical photos, some stars, especially the larger and closer ones, show cross-like patterns of light centered at the star itself. What is this phenomenon called, and why does it occur? I know it is not lens flare, as that is ghostlike circles of increasing diameter coming from a major light source.
They are called "Diffraction spikes." In reflector telescopes, there is a four vane apparatus (called a "spider" ) to hold the secondary mirror in front of the primary mirror. Even tho it is engineered to affect the image as little as possible, it still scatters some light. This effect is worst on the brightest stars in the image because those bright star have more light to scatter.
These spikes are absent in a image taken by a refractor telescope. Refractors, instead, suffer from a rainbow ring around the brightest stars with purple light on the outside of the ring.
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