original question: Which astronomical discovery was discovered at the astronomical observatory where [42 Isis] was discovered?
answer: 43 ariadne, 46 hestia
answer type: Astronomical Discovery.
auxiliary information: 42 Isis is a large main-belt asteroid, measuring 100.2 km in diameter. It was discovered by N.R. Pogson on May 23, 1856, at Oxford. It was Pogson's first asteroid discovery. The asteroid's name was chosen by Manuel John Johnson, director of the Radcliffe Observatory in Oxford. Although Isis is the name of an Egyptian goddess, the name was chosen in homage to Pogson's astronomer daughter, Isis Pogson. In addition, the Isis is the stretch of the River Thames that runs through Oxford. The light curve inversion technique, when applied to photometric observations of this asteroid, show multiple local irregularities. The overall shape displays little elongation, with a ratio between the major and minor axes equal to 1.1. The measured rotation period for this model is 13.59701 hours. The spectrum of 42 Isis reveals the strong presence of the mineral Olivine, a relatively rarity in the asteroid belt.
Which astronomical discovery was discovered at the astronomical observatory where [42 Isis] was discovered?