It's important to note that this number can change frequently as new missions are launched and existing ones are decommissioned. To get the most up-to-date information, you can check resources like:
* NASA's website: https://www.nasa.gov/
* Space.com: https://www.space.com/
* Wikipedia's list of artificial satellites: https://en.wikipedia.org/wiki/List_of_artificial_satellites_of_Mars
