17P Holmes

0bject	Comet 17P Holmes
Date	April 5, 2008
Exposure	LRGB 10:10:10:10 (unbinned, DDP applied)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi FSQ 106N f/5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2, FITS Liberator, GradientXterminator
Comments	Cool, clear and damp

0bject	Comet 17P Holmes
Date	March 10, 2008
Exposure	LRGB 15:15:15:15 (unbinned, luminance synthesized, DDP applied)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi FSQ 106N f/5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2, FITS Liberator, GradientXterminator
Comments	Mild (40º F) and clear; 3 day old moon nearby

Click HERE for an exponential stretch showing the halo.

0bject	Comet 17P Holmes
Date	March 5, 2008
Exposure	LRGB 5:5:5:5 (unbinned, cropped; DDP applied to luminance)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi FSQ 106N f/5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2, FITS Liberator
Comments	Mild (40º F) with snow cover

0bject	Comet 17P Holmes
Date	February 18, 2007
Exposure	LRGB 5:5:5:5 (unbinned)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi FSQ 106N f/5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2, GradientXterminator
Comments	Cold and windy; bright moon. First light for FSQ!

0bject	Comet 17P Holmes
Date	January 27, 2007
Exposure	LRGB 10:10:10:10 (unbinned and cropped; DDP applied to luminance)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2, GradientXterminator
Comments	Cold

0bject	Comet 17P Holmes (with Algol, β Persei)
Date	January 23, 2007
Exposure	LRGB 15:15:15:15 (unbinned and cropped; DDP applied to luminance)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2, GradientXterminator
Comments	Cold (9º F); moderate seeing

0bject	Comet 17P Holmes (with Algol, β Persei)
Date	January 22, 2007
Exposure	LRGB 15:15:15:15 (unbinned and cropped; DDP applied to luminance)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2, GradientXterminator
Comments	Cold (30º F); clear, moon near full

0bject	Comet 17P Holmes (with Algol, β Persei)
Date	January 20, 2007
Exposure	LRGB 15:15:15:15 (unbinned and cropped; DDP applied to luminance)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2, GradientXterminator
Comments	Cold (16º F); clear, some thin clouds; moon 1 day past full

0bject	Comet 17P Holmes
Date	Januar 15, 2007
Exposure	LRGB 15:15:15:15 (unbinned and cropped; DDP applied to luminance)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2
Comments	Cold (36º F); very good seeing but 1st quarter moon high in the sky

0bject	Comet 17P Holmes
Date	Januar 14, 2007
Exposure	LRGB 15:15:15:15 (unbinned and cropped; DDP applied to luminance)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2
Comments	Cold (30º F); good seeing

0bject	Comet 17P Holmes
Date	Januar 11, 2007
Exposure	LRGB 15:15:15:15 (unbinned and cropped; DDP applied to luminance)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2
Comments	Mild (45º F); moderate seeing

0bject	Comet 17P Holmes
Date	December 31, 2007
Exposure	LRGB 15:15:15:15 (unbinned and cropped; DDP applied to luminance)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2
Comments	Cold (26º F); unsteady seeing, windy, with clouds blowing through

0bject	Comet 17P Holmes
Date	December 30, 2007
Exposure	LRGB 8:8:8:8 (unbinned and cropped; DDP applied to luminance)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2
Comments	Cold (36º F); shorter integrations by accident

0bject	Comet 17P Holmes
Date	December 25, 2007
Exposure	LRGB 15:15:15:15 (unbinned and cropped; DDP applied to luminance)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2
Comments	Cold (36º F); waning moon rising

Click HERE for an inverted view (Luminance)

0bject	Comet 17P Holmes
Date	December 23, 2007
Exposure	LRGB 15:15:15:15 (unbinned and cropped; DDP applied to luminance)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2, GradientXterminator
Comments	Cold (32º F); full moon causing nasty gradients

0bject	Comet 17P Holmes
Date	December 18, 2007
Exposure	LRGB 15:15:15:15 (unbinned and cropped; DDP applied to luminance)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2
Comments	Mild (40º F) some thin high clouds; waxing moon

0bject	Comet 17P Holmes
Date	December 16, 2007
Exposure	LRGB 15:15:15:15 (unbinned and cropped; DDP applied to luminance)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2
Comments	Cold (28º F) and clear but with a few high clouds; 1st quarter moon

0bject	Comet 17P Holmes
Date	December 13, 2007
Exposure	LRGB 15:15:15:15 (unbinned and cropped; DDP applied to luminance)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2
Comments	Cold (28º F) with moderate seeing; a few high clouds

0bject	Comet 17P Holmes
Date	November 29 2007
Exposure	LRGB 15:15:15:15 (unbinned and cropped; DDP applied to luminance)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2
Comments	Cool (45º F) with moderate seeing

0bject	Comet 17P Holmes
Date	November 27 2007
Exposure	LRGB 15:15:15:15 (unbinned and cropped; DDP applied to luminance)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2
Comments	Cool (45º F) with moderate seeing

0bject	Comet 17P Holmes
Date	November 24 2007
Exposure	LRGB 45:15:15:15 (unbinned and cropped; luminance synthesized from RGB)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2
Comments	Cold (30º F) with the full moon nearby in the sky

0bject	Comet 17P Holmes
Date	November 20, 2007
Exposure	LRGB 45:15:15:15 (unbinned and cropped; luminance synthesized from RGB)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2
Comments	Warm, moderate seeing, comet about 40º above horizon

0bject	Comet 17P Holmes
Date	November 19, 2007
Exposure	LRGB 45:15:15:15 (unbinned and cropped; luminance synthesized from RGB)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2
Comments	Warm, moderate seeing, comet about 40º above horizon

0bject	Comet 17P Holmes
Date	November 17, 2007
Exposure	LRGB 45:15:15:15 (unbinned and cropped; luminance synthesized from RGB)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2
Comments	Cool, moderate seeing, comet about 60º above horizon

Click HERE for luminance only - log stretched

0bject	Comet 17P Holmes
Date	November 16, 2007
Exposure	LRGB 15:15:15:15 (unbinned and cropped)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2
Comments	Cool, moderate seeing, comet about 60º above horizon

0bject	Comet 17P Holmes
Date	November 15, 2007
Exposure	LRGB 45:15:15:15 (unbinned and cropped)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head w/ E-finder
Processing	MaximDL, PhotoshopCS2
Comments	Cold, moderate seeing, comet about 45º above horizon

0bject	Comet 17P Holmes
Date	November 11, 2007
Exposure	BRGB 45:24:24:24 (unbinned and cropped; Blue used for luminance)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head
Processing	MaximDL, PhotoshopCS2
Comments	Warm, moderate seeing, comet low ~30º

Click HERE for an inverted view

0bject	Comet 17P Holmes
Date	November 5, 2007
Exposure	L+B 45:60 (unbinned and cropped; DDP and exponential stretch)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head
Processing	MaximDL, PhotoshopCS2
Comments	Cool and clear, breezy

0bject	Comet 17P Holmes
Date	November 4, 2007
Exposure	LRGB 30:15:15:15 (unbinned and cropped)
Camera	STL11000 with Astronomik filters
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head
Processing	MaximDL, PhotoshopCS2
Comments	Moderate seeing with noticeable sky glow

Mouse over for stretched view; click HERE for an inverted image

0bject	Comet 17P Holmes
Date	November 3, 2007
Exposure	10 x 180 seconds (unbinned)
Camera	STL11000
Telescope	Takahashi Sky90@ f/4.5 on Losmandy G11 w/Gemini
Guiding	remote guide head
Processing	MaximDL, PhotoshopCS2
Comments	Long exposure to reveal tail(s)

0bject	Comet 17P Holmes
Date	October 30, 2007
Exposure	LRGB 8 x 30 (30 sec subexposures x 8 binned 2x2; L synthesized RGB)
Camera	ST2000XM with SBIG filters
Telescope	Celestron C8 @ f/5 on Losmandy GM-8
Guiding	unguided
Processing	MaximDL, PhotoshopCS2
Comments	Bob Judd and Gregg Ruppel; comet halo continues to expand; mouse over image to apply rotational gradient filter

0bject	Comet 17P Holmes
Date	October 29, 2007
Exposure	LRGB 20 x 5 (5 sec subexposures x 20 unbinned; L synthesized RGB)
Camera	STL11000M with Astronomik filters
Telescope	Takahashi Sky90 @ f/4.55 on Losmandy G11 w/ Gemini
Guiding	unguided
Processing	MaximDL, PhotoshopCS2
Comments	Comet seems to have dimmed slightly; green halo faintly visible.

0bject	Comet 17P Holmes
Date	October 28, 2007
Exposure	RGB 20 x 5 (5 sec subexposures x 20 unbinned)
Camera	STL11000M with Astronomik filters
Telescope	Takahashi Sky90 @ f/4.55 on Losmandy G11 w/ Gemini
Guiding	unguided
Processing	MaximDL, PhotoshopCS2
Comments	Comet still low (~30º); still fairly bright - mag 2.5; a bright star shining through the halo gives the appearance that the nucleus has split.

Larson Sekanina filter applied; color composite (10/27/2007)

0bject	Comet 17P Holmes
Date	October 27, 2007
Exposure	RGB 10:10:10 (30 sec subexposures x 20 unbinned)
Camera	ST2000XM with SBIG filters
Telescope	Celestron C8 @ f/5 on Losmandy GM-8
Guiding	unguided
Processing	MaximDL, PhotoshopCS2
Comments	Bright moon in sky

Synthesized luminance from R+G+B

Color image with rotational gradient (Larson-Sekanina) overlay

Rotational gradient (5%) applied to luminance (Larson-Sekanina)

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