Observations of Comet 17P/Holmes

All observations by Carl Hergenrother, Lunar and Planetary Lab, University of Arizona

Last Update: 2007 Oct. 30

The purpose of this page is to show some of my more interesting comets observations. Most of my target comets are either inactive or only weakly active and, as a result, are not very photogenic.

Observations of 73P/Schwassmann-Wachmann 3 (components B, C and G) from April and May of 2006 can be found here.


Observations of 17P/Holmes in super outburst.
17P on 2007 Oct. 30.18 UT
My backyard Orion XT12i 0.31-m f/5 with a DMK 41AF02.AS camera
Co-added average of 144 x 0.567 second exposures with no filter
Plate Scale = 0.64" per pixel
Field of View is ~ 13.6' x 10.2'
North to top and East to the left
NOTE: the series of lines are streaks around the edge of the images are
due to the process of stacking, shifting and rotating the images and
are not real.    

Co-added average image of 17P with no processing.

Co-added average image processed with a radial gradiant filter with a
kernal size of 11 pixels


17P on 2007 Oct. 29.21 UT
My backyard Orion XT12i 0.31-m f/5 with a DMK 41AF02.AS camera
Co-added average of 162 x 0.267 second exposures with no filter
Plate Scale = 0.64" per pixel
Field of View is ~ 13.6' x 10.2'
North to top and East to the left
NOTE: the series of lines are streaks around the edge of the images are
due to the process of stacking, shifting and rotating the images and are

Co-added average image of 17P with no processing.

Co-added average image processed with a radial gradiant filter with a
kernal size of 11 pixels


17P on 2007 Oct. 28.20 UT
My backyard Orion XT12i 0.31-m f/5 with a DMK 41AF02.AS camera
Co-added average of 149 x 0.267 second exposures with no filter
Plate Scale = 0.64" per pixel
Field of View is ~ 13.6' x 10.2'
North to top and East to the left
NOTE: the series of lines are streaks around the edge of the images are
due to the process of stacking, shifting and rotating the images and are

Co-added average image of 17P with no processing.

Co-added average image processed with a radial gradiant filter with a
kernal size of 11 pixels


Observations of 17P/Holmes in super outburst. 
17P on 2007 Oct. 27.28 UT
My backyard Orion XT12i 0.31-m f/5 with a DMK 41AF02.AS camera
Co-added average of 152 x 0.267 second exposures with no filter
Plate Scale = 0.64" per pixel
Field of View is ~ 13.6' x 10.2'
North to top and East to the left
NOTE: the series of lines are streaks around the edge of the images are
due to the process of stacking, shifting and rotating the images and are

Co-added average image of 17P with no processing.

Co-added average image processed with a radial gradiant filter with a
kernal size of 11 pixels