Boötes

When and where to look for Boötes

Boötes crosses the meridian — its highest point in the sky — at local midnight around May, which makes the months from April to June the easiest time to find it in the evening. It spans declinations +13.7° to +51.9°, so visible from everywhere north of about 38°S.

The quickest way to find it is to open the live AR sky map and point your phone at the sky — if Boötes is above your horizon right now, its figure is drawn in the position it genuinely occupies above you.

Brightest stars in Boötes

Magnitude runs backwards: lower numbers are brighter, and anything below about 6.5 is beyond the naked eye under a dark sky.

What Boötes is made of

The catalogue lists 146 stars within Boötes, of which 146 are magnitude 6.5 or brighter — the limit of what an unaided eye picks up under a genuinely dark sky. The rest need binoculars or a telescope.

Spectral make-up

Spectral class is a temperature ordering, running from O at around 30,000 K down to M below 3,500 K. A constellation is a direction, not a group, so this is simply what happens to lie along that line of sight.

The closest catalogued star in this direction is 37Xi Boo at 21.9 light years. The most distant is HD 126307 at roughly 1,989 light years — stars that appear side by side here are nothing of the sort.