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Astrometry from Gaia will measure the positions of stellar photometriccentroids to unprecedented precision. We show that the precision of Gaiaastrometry is sufficient to detect starspot-induced centroid jitter for nearbystars in the Tycho-Gaia Astrometric Solution (TGAS) sample with magneticactivity similar to the young G-star KIC 7174505 or the active M4 dwarf GJ1243, but is insufficient to measure centroid jitter for stars with Sun-likespot distributions. We simulate Gaia observations of stars with 10 yearactivity cycles to search for evidence of activity cycles, and find that Gaiaastrometry alone likely can not detect activity cycles for stars in the TGASsample, even if they have spot distributions like KIC 7174505. We review theactivity of the nearby low-mass stars in the TGAS sample for which weanticipate significant detections of spot-induced jitter.

Spotting Stellar Activity Cycles in Gaia Astrometry