Hi John and others,

C/2006 P1 (McNaught):
2007 Jan. 10.587: m1=-2.5:*, Dia=30", DC=9, Tail=5' in PA~0
deg...10x50B...Piotr Guzik (Krakow, Poland)[I found the comet around
14:05 UT - when the Sun was 5.9 deg above horizon. The comet was
pretty well visible with handheld 10x50 binoculars. I could even spot
~5' of tail. Then I estimated its magnitude (simply comparing with
Venus).]

Later I had to go to another place and shortly before sunset I could
see the comet easily with 10x50B through thin cirruses. I spotted it
with naked eye 5 minutes after sunset (which took place at 14:59 UT)
though it was still in thin cirruses.

C/2006 P1 (McNaught):
2007 Jan. 10.651: m1=-2.9*, Dia=&2', DC=9, Tail = 4 deg in PA~0
deg...NE...Piotr Guzik (Krakow, Poland)[The conditions were excellent
- I could very clearly see Tatra mountains which were ~90km from my
location. The comet was awesome sight. The tail could be traced AT
LEAST to 4 degrees both with binoculars and with naked eye. It had
extremely high surface brightness. It was curved to west and its
eastern border was much more pronounced than western. I could still
see it for several minutes after the comet had set behind the hills at
true altitude 2.0 deg. It was also easy to see "nucleus shadow"
through binoculars. Comet at first was perly-white and later became
golden, thus the color is an atmospheric effect. I used Venus and
Altair to estimate comets brightness. The observation is corrected for
atmospheric extinction with a parameter of 0.15 mag per airmass as the
sky was extremely transparent.]

Best Regards
Piotr Guzik