not young but sub luminous ?

Forums Deep Sky At 2020nlb – a possible Supernova in M85 not young but sub luminous ?

Robin Leadbeater

Now classified as a Ia but the classifiers suggest it could be a subluminous supernova around/post maximum light rather than  caught early.

It seems odd in that case though that  it was not visible to ATLAS 2 days previously

(hopefully link not mangled this time !)