In astrology, comets are not really considered to the same extent as the planets and asteroids but can still be interpreted. In the past, they were indeed bad omens, often signalling negative events such as wars or natural disasters. They don’t have firm established meanings but more generally, they represent periods of transformation, new beginnings, or sudden change (think of their sudden appearance in the sky). They are also seen as a time to take stock and re-examine your life path.
The interpretation of a comet is often intuitive and can depend on different factors, including:
Brightness
Very Bright Comets may suggest major events or shifts. A bright comet can bring a time of clarity, awareness, or collective awakening. Faint Comets could indicate subtle changes or personal introspection. They might suggest that any shifts are more internal rather than external.
Colour
Green: Renewal, growth, and new beginnings, healing and prosperity.
Red: Urgency, passion, or conflicts, strong emotions or transformative experiences.
Blue or White: Clarity, communication, intellect, insight or enlightenment.
Tail Length
Long Tails suggest significant transitions that will be felt for an extended period. Short Tails indicate quick changes or immediate impacts.
Trajectory:
Comets with a direct path are often linked to clear and decisive changes, suggesting that the events will unfold in a straightforward manner. Comets with Erratic Paths suggest unpredictability and chaos.
I guess looking at these details about a particular comet could give an indication of the energies at play.
If you are thinking about the A3 comet, it is considered a BRIGHT GREEN with a LONG tail and a DIRECT path.
hope this helps
Alan