Original: In fact, it is the third dimmest of the first twenty-three asteroids discovered (only 13 Egeria and 17 Thetis having lower mean opposition magnitudes.
Simplified: In fact it is the third dimmest of the first twenty-three asteroids discovered, with only 13 Egeria and the quite small 17 Thetis having lower mean opposition magnitudesThe Brightest Asteroids.