Luminance only, 6 seconds subexposures, 10 stacked shots. FITS Liberator, GIMP. North is up; east is left.
When I first viewed this system on the evening of 22 May '15, I did not spot the C star. While B is too close to bright A in the image, C is obvious at the 4 o'clock position (i.e. south-west), close, with D, away, at 7 o'clock (or south-east).
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Stretched dramatically with the x1/2 function. The B star emerged!
Zoomed/cropped. B is at the 10 o'clock position.
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Processed in colour on 6 May '17.
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