たん周期 しゅうき彗星 すいせいでしょう
tanshūki sui seideshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 短周期彗星

1. Short-period comet, likely.; Probably a short-period comet.

Polite
Presumptive
Conjecture
Astronomy