Then Ziusudra opened a window in the large boat, allowing sunlight to enter, and he prostrated himself before the sun-god Utu.
Ndengei sent his messenger Utu to find the bird.
Lines 11-15: "Enmerkar, the son of Utu, the king of Unug (Uruk), the lord of Kulaba, Enmerkar, the king of Unug, who made the neck-stock of the people of Aratta bow, He determined that the people of Aratta should be subjected to him, that they should bear the heavy yoke.
Lines 16-20: "Enmerkar, the son of Utu, called upon his minister, His minister who was familiar with the words of Aratta.
Say to him: "The lord of Kulaba, Enmerkar, the son of Utu, has sent me to you."' The lord of Kulaba has brought together the people of Uruk, who are numerous as the stars."
It was not primarily or consistently the sun god; the sun god was Shamash (Utu in Sumerian).)
This imprint pictures a sexual intercourse of sun god Utu with Inanna, a goddess of the Sirius star.
In the next verse the conjunction of Sirius with the sun is described as Inanna riding together with her brother, the sun god Utu: Source
Utu: God of the sun and justice, Anunnaki
dumu {d}utu en-am3 en: son of Utu, was lord,98.
isz-me-{d}utu mu 1(u) 1(disz) i3-ak en: Išme-Šamaš, 11 years he ruled;254.
ur-{d}utu mu 6(disz) i3-ak en: Ur-Utu, 6 years he ruled;304.
unu{ki}-ga {d}utu-he2-gal2 lugal-am3 en: In Uruk Utu-hegal was king,336.
Then Ziusudra opened a window in the large boat, allowing sunlight to enter, and he prostrated himself before the sun-god Utu. After landing, he sacrificed a sheep and an ox and bowed before Anu and Enlil. For protecting the animals and the seed of mankind, he was granted eternal life and taken to the country of Dilmun, where the sun rises.
Utu, the sun god, sends light into it.
Utu - God of the sun and justice