Stationary star-like object that completely turned on and off at regular intervals.

I saw a stationary star-like object in the SSE sky that completely turned on and off at regular intervals like an airplane light.  While it was visible, it twinkled like a star would do before fading to a yellowish hue and disappearing while still flashing.
It was of similar color to Sirius but not quite as bright and was about 25 or 30 degrees above the horizon.  It looked exactly like what a star would look like if somebody were turning it on and off like a light bulb once per second.
Airplane lights aren't this bright and don't twinkle like a star.  Sirius rose an hour later.
Witness indicates that the date of the sighting is approximate.  PD