5154 20210209181327.0 10.3847/2515-5172/abaa41 DOI SCART-2021-0024 Monier, R. Rotational Variability in the TESS Light Curve of 21 Com 2020 We present an analysis of the TESS-based light curve of the chemically peculiar A-type (Ap) star 21 Com (HD 108945). We used the simple aperture photometry light curve with a time span of 27 days. A least-squares fit to the data with 10 harmonics yields a frequency of 0.48726 day$^{-1}$, which corresponds to a rotational period of 2.05229 days. Furthermore, we find no evidence of any short-term variability beyond the pure rotational signature. NO Chemically peculiar stars Stellar rotation Lampens, P. Research Notes of the American Astronomical Society 4 2020 7 121 patricia.lampens@observatoire.be https://ui.adsabs.harvard.edu/abs/2020RNAAS...4..121M published in NONREF