Archive for May 27, 2016

05/27/2016 – Ephemeris – Alkaid, the star at the end of the Big Dipper

May 27, 2016 Comments off

Ephemeris for Friday, May 27th.  Today the Sun will be up for 15 hours and 14 minutes, setting at 9:17, and will rise tomorrow at 6:02.   The Moon, 2 days before last quarter, will rise at 1:40 tomorrow morning.

The star at the end of the handle of the Big Dipper is named Alkaid.  It is the bright star that’s closest to the zenith at 11 p.m.  It is a rare blue-white star.  Alkaid and Dubhe, at the other end of the Big Dipper are stars that do not belong to the Ursa Major Association.  And thousands of years from now these two stars will leave the central stars of the dipper behind, and deform the Big Dipper.  Over the millennia the Big Dipper would look like a tin cup.  Near Alkaid are two popular deep sky objects.  And being this far from the hazy band of the Milky Way one would guess that they would be galaxies.  And they are. The Whirlpool Galaxy and the Pinwheel Galaxy.  Two gorgeous spiral galaxies.

Times are for the Traverse City/Interlochen area of Michigan. They may be different for your location.


The change in the Big Dipper over time.

The change in the Big Dipper over time. Source:  Ultimate source:  Stellarium.

Alkaid and the Big Dipper

The Big Dipper and Alkaid with the Whirlpool (M51) and Pinwheel (M101) galaxies. Created using Stellarium.


The Whirlpool Galaxy, M51. Credit Scott Anttila.


The Pinwheel Galaxy, M101. Credit Scott Anttila.