Rotators in Praesepe with K2 LCs and Gaia EDR3

We measure new rotation periods (Prot) for 220 ~<1.3M_{sun}_ Praesepe members and recovery periods for 97% (793/812) of the stars with a Prot in the literature. Of the 19 stars for which we do not recover a Prot, 17 were not observed by K2.

As K2's three Praesepe campaigns took place over the course of 3yr, we test the stability of our measured Prot for stars observed in more than one campaign. We measure Prot consistent to within 10% for >95% of the 331 likely single stars with >=2 high-quality observations; the median difference in Prot is 0.3%, with a standard deviation of 2%. Nearly all of the exceptions are stars with discrepant Prot measurements in Campaign 18, K2's last, which was significantly shorter than the earlier two (~=50 days rather than ~=75 days).