The comet had been seen quite easily in the 20cm refractor until recently, but it has dimmed considerably in the past week. At 5 am on December 7, it was at 7th magnitude and rather diffused with the diameter being about 4'. It is important to keep a close watch to see if it brightens by the time it reaches perihelion on January 6 next year. The above magnitude matches the prediction, and the brighter magnitudes recorded earlier may be due to outbursts.
• C/1999 T1(McNaught-Hartley)
5.30 on December 7, 2000
4-minute exposure on Technical Pan
Tsutomu Seki at Geisei Observatory
Copyright (C) 2000 Tsutomu Seki.