As an AI system, I don't have the ability to physically observe or locate stars. My knowledge base comprises information that was available up to the date of my last system update in September 2021.

Based on the information available to me, the largest known star is UY Scuti.

Here is some information about UY Scuti:

UY Scuti is a red supergiant star located about 9,500 light-years from Earth in the constellation Scutum.

It has an estimated radius of approximately 1,700 times that of our Sun, making it one of the largest stars discovered.

If placed at the center of our solar system, its surface would extend beyond the orbit of Saturn.

UY Scuti is classified as a variable star, meaning its brightness fluctuates over time. It belongs to the pulsating red supergiant class of variable stars.

The star is extremely luminous, emitting an immense amount of energy. Its luminosity is estimated to be several thousand times greater than that of the Sun.

UY Scuti is believed to be in the final stages of its life cycle and may eventually undergo a supernova explosion, releasing an enormous amount of energy and matter into the surrounding interstellar space.

It's important to note that astronomical research is constantly evolving, and new discoveries may have been made since my knowledge cutoff date. To obtain the most up-to-date information, I recommend checking reliable astronomical sources.