Home > Constellations, Ephemeris Program, stars > 09/29/11 – Ephemeris – Deneb at the zenith

09/29/11 – Ephemeris – Deneb at the zenith

September 29, 2011

Thursday, September 29th.  The sun will rise at 7:37.  It’ll be up for 11 hours and 49 minutes, setting at 7:27.   The moon, 2 days past new, will set at 8:28 this evening.

At 10 p.m. tonight the first magnitude star Deneb will be overhead, that is very near the zenith.  Deneb is the northern most and dimmest of the three stars of the Summer Triangle.  It is at the head of the Northern Cross, which extends to the south.  This is an asterism, which is what astronomers call a informal constellation.  The Big and Little Dippers are also examples of asterisms.  You won’t find them in the list of the 88 official constellations.  The actual constellation that Deneb belongs to is Cygnus the swan.  In the swan Deneb is the tail.  That’s actually what Deneb means.  The swan is flying southwestward along the Milky Way with its wings outstretched.  Stars can be followed around the wings to make out a very realistic flying swan.

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

Addendum

Deneb at the Zenith. Looking overhead while facing south.  Created using Stellarium.

Deneb at the Zenith. Looking overhead while facing south. Created using Stellarium.

The Summer Triangle of bright stars Deneb, Vega and Altair are in this view.

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