officially called: Hanny's Voorwerp (SDSS J094103.80+344334.2)
apparently, it is actually green, emitting a wavelength of 520 nanometers.
http://www.astr.ua.edu/keel/research/voorwerp.html
Quote:
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Two rounds of BVR imaging were done in December and January 2008 with the 0.9-m SARA remote telescope. This confirms that much of the emission emerges in a narrow band included in Johnson V; overlapping this with g confined that to the range 5000-5500 Angstroms. The color montage below is from these data and shows a more "true-color" view when pasted together as an RGB image.
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