Emotions are key features of observations of the sky, yet studies exploring the characteristics of emotions in these activities remain scarce. In this article we analyse the emotions present in a video corpus of 13 hours of sky observations. These observations were recorded and analysed using a naturalistic approach that provides evidence about their structure and the role of emotions as they happen, in context. Although common throughout our data, emotions are complex and varied. We characterize their form, placement, evocation and role in the interaction. Moreover, findings highlight the collaborative nature and centrality of the sharing of emotions in the interaction and the presence of expressions of intimacy, authenticity, contemplation, reflection, and curiosity in these emotional moments. The identification of diverse emotional interactions and the discussion of their importance to astronomy communication contributes to the literature on emotions, the training of guides, and the evaluation of these activities.