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Sirius And Pup
Separation between the two varies between 2 arc-seconds and 10 arc-second, as the 8th mag white dwarf orbit Sirius on its 50 year journey.
Minimum separation was in the mid 1990s, since then the pair has slowly drifted apart again. Over the next few years the pair will be at about 8 arc-second separation, giving us plenty of opportunities to enjoy the most challenging binary star, challenging, because of the huge difference in brightness between the two. I choose my 8 inch scope in order to avoid the spikes.
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