The most accurate translation of "celestial body" in Farsi would be:

جرم سماوی (Jorme Samavi)

* جرم (Jorme): Body, object

* سماوی (Samavi): Celestial, heavenly

This phrase is commonly used in scientific contexts.

Here are some other options, depending on the context:

* ستاره (Sitare): Star (for smaller celestial bodies)

* سیاره (Siyare): Planet (for larger celestial bodies)

* آسمانی (Asmani): Heavenly, celestial (more general term)

The best choice will depend on the specific meaning you want to convey.