Soromúmë seems to mean ‘Eagle of the West’.

It was a constellation created by Varda with the dews of Telperion that presented in the shape of an eagle. It would probably correspond to our Aquila. The three stars Altair, Deneb and Vega form the well-known Summer Triangle, therefore we can assumed that you might be able to see it in the summer.
Encyclopedia entry originally written by servant_ofthe_Secret_Fire