There are at least three catalogues that are counting up-to-date discovered exoplanets. What criteria do they use to count the number of planets? Every catalogue has a different count value.
So at this moment various catalogues as:
- Open exoplanet catalogue
- NASA exoplanet archive
show values of confirmed number of exoplanets between approx. 3500 and 4050.
Why do they disagree with each other?