  Coma Berenices (Coma Ber), an open cluster about the same age as Praesepe and
the Hyades (700-800 Myr) is, despite being only 85 pc away, less well studied
than its famous cousins. This is due principally to its sparseness and low
proper motion, which together made Coma Ber's membership challenging to
establish pre-Gaia. We have curated a new list of its members based on Gaia DR2
astrometry, derived its metallicity and interstellar reddening using LAMOST
data, and inferred the cluster's age by fitting PARSEC isochrones to its
color$-$magnitude diagram. We then measured rotation periods for Coma Ber's
low-mass members using TESS and ZTF photometry. Our isochrone fitting and the
TESS- and ZTF-derived rotation periods confirm that Coma Ber is coeval with the
Hyades and Praesepe. This work is the first step toward re-establishing Coma
Ber as another valuable benchmark cluster for age$-$rotation$-$activity
studies.
