Nitpick: as a non-SI unit recognized for use in astronomy[0] "jansky" is always lowercase, not capitalized.
This is true for all SI units. Newton, watt, and joule are all lowercase, unless they appear at the beginning of a sentence or when you're referring to the original scientists.
People often get confused because the abbreviations for those units are capitalized.
This is true for all SI units. Newton, watt, and joule are all lowercase, unless they appear at the beginning of a sentence or when you're referring to the original scientists.
People often get confused because the abbreviations for those units are capitalized.
[0] https://www.iau.org/publications/proceedings_rules/units/