XO-2Nb is an exo-planet in Lynx it has an orbital period of 2.6159 days.

Observed by Martin Crow as part of the Exoclock project.

XO-2Nb-2020jan20

More info:

And the paper that it relates to:

https://iopscience.iop.org/article/10.3847/1538-3881/ab1cb9