shown in this image is Comet Lulin as it passes Regulus, the brightest star in the constellation Leo (click to enlarge.) This is a lousy image, plain and simple, but I post it to show that stars do indeed have "color" that reflects their temperature, and the comet is glowing green as cyanogen (CN) gas is volatilized from its nucleus and the ions excited in the solar wind. I captured this image the evening of 27 February: 1 min exposure on non-tracking mount, ISO 1600, f/2.8, Canon 30D with 300 mm telephoto lens.
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