[vsnet-alert 22292] ASASSN-18ey = MAXI J1820+070: decline of superhumps?

[Yasuyuki WAKAMATSU]

ASASSN-18ey = MAXI J1820+070: decline of superhumps?

Michael Richmond, Tonny Vanmunster, Domenico Licchelli,
Geoff Stone, Berto Monard, Stephen Brincat, Lew Cook, Ian Miller
and Crimean Astrophys. Obs. team (A. Baklanov, A. Sosnovskij,
O. Antonyuk and E. Pavlenko) reported further observations.

Amplitudes of superhumps in this object are now ~ 0.4 mag and
seem to reduce after July 7. This value, however, contains some
uncertainties because of the shortage of observations around
superhump minima. The magnitude is now about 13.3 mag, and
the superhump period is 0.6874(1) d.

Further observations are strongly encouraged to detect the following
change of superhump amplitudes.