Posts Tagged ‘Mirphak’

11/28/2014 – Ephemeris – Not quite a star cluster, but pretty cool nonetheless

November 28, 2014 Comments off

Ephemeris for Friday, November 28th.  The sun will rise at 7:55.  It’ll be up for 9 hours and 9 minutes, setting at 5:04.   The moon, 1 day before first quarter, will set at 12:01 tomorrow morning.

When is a star cluster not a star cluster?  When it’s an association.  That is when it has begun to dissipate because the gravitational force of the group cannot hold it together.  The central stars of the Big Dipper belong to The Ursa Major Association.  Below the W shaped constellation of Cassiopeia in the northeast at 9 or 10 p.m.  Is the constellation of Perseus (Per-seus or Pers-e-us) as it is usually pronounced.  Its brightest star is Mirfak with a designation of Alpha Persei.  There are some stars there to the naked eye, but with binoculars there are a great many stars just below naked eye visibility.  This is called the Alpha Persei association.  It is perfect to spot with binoculars, but way too wide-spread for a telescope.

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


The Constellations Cassiopeia, Perseus and Auriga. Cartes du Ciel

The Constellations Cassiopeia, Perseus and Auriga. Cartes du Ciel

Alpha Persei Association

Alpha Persei Association. Created using Stellarium.