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Liz,
Had to do 5 and couldn't restrict it to just doubles. Then I thought of sigma Orionis. Better not go over-board! Didn't know what sort of detail you wanted but these are my favourites (in no particular order) ...
1. Almach (gamma Andromedae). Triple star system but only seen as two stars magnitudes 2.3/5, separation about 10". Striking contrast- yellowish orange and blue pair.
2. beta Monocerotis. Triple star mags 4.6/5/5.3, separations AB about 7" and BC about 3". All blue-white (B3) stars. Fantastic triplet.
3. 145 Canis Majoris (h 3945). Double star, magnitudes 5/5.8, separation 27". Striking orange and bluish pair.
4. Regor (gamma Velorum). System of four stars magnitudes 1.8/4.1/7.3/9.4, separations 41", 63", 94". Primary is the brightest known Wolf-Rayet star. Has the nice shape of a capital Y.
5. Albireo (beta Cygni). System seen as two stars magnitudes 3.2/4.7, separation about 36". Famous orange and blue pair.
Furthest north is Almach at about +42 degrees declination.
Regards, Rob
Last edited by Robh; 29-05-2009 at 11:26 AM.
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