Discovering Eurybates' Satellite

The Lucy spacecraft mission, set to launch in 2021, aims to explore Trojan asteroids. During preparations, a small satellite was discovered orbiting the asteroid Euripedes. Using the Hubble Space Telescope, the team confirmed the satellite's existence and orbit, naming it Ketta. This discovery enhances our understanding of asteroid formations and the history of the solar system.

How did the team confirm that the faint spot observed was indeed a satellite?

What is the significance of naming the satellite 'Ketta' and who is it named after?