When did US solar system probe Voyager-two discovered six new moons of the planet Uranus?

In 1986 US solar system probe Voyager-two discovered six new moons of the planet Uranus. Scientists believe they have discovered two new moons orbiting the planet Uranus. A team re-examining data captured by the Nasa space probe Voyager 2 in 1986 found evidence of the small, dark "moonlets" lurking behind the large gas planet and making "waves" in its closest rings.