Comet 17P/Holmes - 10 Nov 07


The comet lost the tail while approaching to Mirfak, Alpha Persei. The blue tail is quite long and exceed the field of vew, more than 2°. The dust coma is 16' wide and 23' long (in the sunward direction). The gas coma is 32'x43'.


A logarithmic photometric profile in the sunward direction show the real dimensions in arcminutes.

Technical Data
Optics Pentax 75 apo refractor
Focal Lenght 500 mm
Focal Ratio f/6.7
Exposure Time Total 1.5 h (300 s single frames)
CCD Canon EOS 350D (unmodified)
Sensor -
Filters -
Chip emperature
 -
Location Bogli (Appennines, Italy) at 1350m height
Date and time of exposure start 10 november 2007, 19.24 UT
Mount Kenko NES
Tracking ST4
Temperature and humidity T=+5°C, RH=40%
Notes Wind that ruined some images.

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