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Comet 17P/Holmes ~ California Central Coast ~ Fred Watson
Top panels: 12 Nov 2007 ~ 8:30 - 9:30 PST
Middle panels : 3 Nov 2007 ~ 8:30 - 9:30 PST
Bottom panels: 24 Oct 2007 ~ 8:00 - 9:30 PST
See spaceweather for more info.
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12 Nov
Too big to fit on the CCD!
Just looking around the central area to see
what might be lurking in the shadows
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Sequence at left:
- 24 Oct
- 3 Nov
- 12 Nov - tail side
- 12 Nov - centered
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All shots Celestron Nexstar 8SE,
Meade DSI Pro II w/ f3.3 reducer,
3 x RGB x 8 sec exposures,
Alt-Az
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3 Nov 2007
Same field of view as the two images below (with f3.3 reducer) ~ i.e. it is MUCH bigger now.
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RGB Composite. Each color is a combination of about 5 x 2sec exposures.
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RGB Composite. Each color is a single 8sec exposure.
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Bright start lower left is GSC 3325:598. Reddish one lower right is GSC 3325:117. Separation between these = 21'22"
Jupiter's angular diameter tonight = 0'33". Moon's = 30'11". Comet is about 13' in this image. |
24 Oct 2007
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Third try ~ with f3.3 focal reducer ~ 1 sec exposures
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Fourth try - with f-reducer ~ longer exposures
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First try (the 'tail' is a tracking error) ~ 1 sec exposures
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Second try ~ longer exposures.
Stars are from Mag 11.1 (top of screen, GSC 3334:686) to 13.7. |
I think all images are CCD-saturated in the central area; so the size of the disk is really an indication of light gathered, and not so much an indication of the physical dimensions of the comet. (Not 100% sure) |
Equipment
- Celestron Nexstar 8 SE
- Alt-az mount
- JMI Motofocus
- Meade DSI Pro II
- +/- Meade f3.3 f-reducer
- Dark subs (not on 24 Oct)
- Meade Image Processing (not on 24 Oct)
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