Either a manifestation of Astarte, or a Goddess that doesn't have a Ritual yet.
There's no real way to know if you haven't been told by the Gods and this hasn't been revealed by Clergy. Speculation is fun, but it's also not that productive, as many Gods can share dominions, correspondences and so on. Many would, for example, struggle to guess that Amon Ra and Helios are not the same God had it not been for clarification by Clergy.