see also: Sodium Brightening of (3200) Phaethon near Perihelion.
Qicheng Zhang at all.
https://iopscience.iop.org/article/10.3847/PSJ/acc866
Our analysis shows that Phaethon's comet-like activity cannot be explained by any kind of dust," said Qicheng Zhang, a California Institute of Technology PhD student who led the new study into Phaethon, in a NASA statement(opens in new tab).
For former Starspot based Comets like Tadpoles see below>see: Expanding Earth, by Growing Water based Crashed Comet core.Interference Black Holes, Photonic Molecules, Ball Lightning, Micro Comets, Sprite-Fireballs and Sunspots According to Quantum FFF Theory.
Comet and Ball Lightning micro black holes compressed by the local dark energy axion vacuum and repelling all Fermions,
Fermion production at the trapped space horizon of each micro black hole.
Examples of expelled massless Starspots micro black holes from a Pulsar nova.