I want to know the answer to the following question:
What was Challis looking for when he saw Neptune the first two times?
All the background I'm provided with is that "Challis later realised that he had observed the planet twice, on 4 and 12 August, but did not recognise it as a planet because he lacked an up-to-date star map and was distracted by his concurrent work on comet observations.". Is that enough to answer the question?