Has had a recent outburst and my latest two measurements show it as V mag. 16.9 on 2022-07-11 and then on 2022-07-20 a V mag. of 12.3. Quite an outburst. Seems to happen every 2 months.
Photometry using ASTAP, plot from AAVSO VStar.
UPDATE: 2022-07-31 now very faint down at mag. 17 and on its base magnitude.
UU Aql 2022-07-11 / 2022-07-20
Mag. 16.94 +- 0.09 / Mag. 12.33 +- 0.01
2022-07-11 23:49 UT 2022-07-20 23:04 UT
250mm f4.8 Newtonian, MPCC
Atik 460EX @-10°C
3 x 180s 2 x 180s d,f,b
Dwarf Nova illustration
Credit: NASA and L. Hustak (STScI)
Current theory suggests that dwarf novae result from instability in the accretion disk, when gas in the disk reaches a critical temperature that causes a change in viscosity, resulting in a temporary increase in mass flow through the disc, which heats the whole disc and hence increases its luminosity. The mass transfer from the donor star is less than this increased flow through the disc, so the disc will eventually drop back below the critical temperature and revert to a cooler, duller mode. Wikipedia