Sopdet

Links to recommended articles:

Sah and Sopdet, the Egyptian Astral God and Goddess / by Jefferson Monet

Sopdet, Goddess of Sirius, the New Year and the Inundation / by Caroline Seawright

Satet, Archer Goddess of the Inundation and the Nile Cataracts / by Caroline Seawright

The Inundation / by Caroline Seawright

Sopedu - the Border God

The Nile, the Moon, and Sirius: Egypt's ancient calendar

Satis, Border Goddess

Star Groups on the Shield of Achilles / by Robt. Hannah, 1994:

Sothis

Sirius (Sothis in Greek, Sopdet in Egyptian) is the brightest star in the sky. It is identified with Isis in many Egyptian texts. The first appearance of Sirius in the sky announces the annual flooding of the river Nile.

Sirius is called The Dog Star; it is the eye of the dog in the constellation Canis Major (Latin for the greater dog).

The Wikipedia article about Sothis contains astronomical and mythological information.

Sirius has its fearsome side. Its rising is also associated with seasons of illness, heat, and destruction..

It is not a single star, but a binary star system.

The Tour Egypt website also has a good article; so does Crystalinks.