91- 19 B 97-11-02 01:35 RGL 146.9 1.0 8 18.36 My obs of 31 Oct showed it at 18.45 seconds. I did a better job of the early flash periods which were in the 17.5 second range. I assume this is the synodic effect. Regardless, I tried to use comparable periods (same portion of the sky) to avoid biasing the data. Ron Lee