Full Idea
Emotions have more specific objects than moods. The difference is a matter of degree, so emotions don't necessarily have a specific object, and moods are not necessarily undirected towards an object, or lacking in intentionality.
Gist of Idea
Unlike moods, emotions have specific objects, though the difference is a matter of degree
Source
Peter Goldie (The Emotions [2000], 2 'Intentionality')
Book Reference
Goldie,Peter: 'The Emotions' [OUP 2002], p.17
A Reaction
Could you simultaneously have an emotion and a mood which were in conflict, such as joy and misery (singing the blues), or love and hate ('odi et amo')? Could one transition into the other, as the object became clear, or faded away?