C/2007 N3 Lulin Magnitude ~9.5
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Stack of 41 x 3 minute exposures aligned on the stars!
The comet's relative motion is so slow that there was no blurring with my 5
arc second sampling. |
Screen shot from SkyMap Pro 10
http://www.skymap.com/ .
I was a little disappointed because SkyMap
indicated a fairly open area of sky. But the faintest stars in the data base
are only about magntude 18, and the camera sees much deeper, as seen at
left. |
| Scope: | Takahashi E160 at f/3.3 | |||
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Image: |
Single 90 second frame, binned 2x2, unguided, SXV-H9 camera Acquired with AstroArt 3.0. Processing ImagesPlus for most processing operations; MaximDl for annotation; AstroArt 3.0 for Isophotes, color. | |||
| Filters: | None | |||
| Conditions: | 19.0 mags/ sq arc second = 4.7 NELM 40 miles west of Chicago Seeing very poor (but doesn't matter for comets!) | |||
| Mount: | AP1200GTO | |||
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Comments:
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The comet was moving very slowly (0.014 arc second
/minute) so I was limited in
exposure time by the sky background of 19.0 mags/sq arcsec to 180 seconds
(binned 2x2). Seeing was incredibly poor, but with 5 arc second sampling (binning 2x2) it didn't matter. During focusing on a relatively dim star with AA3, the focus image kept jumping around filling 3 to 6 pixels -- usually I can focus to just one pixel. |
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| SkyMap Pro 10 http://www.skymap.com/ screenshot showing the comet in Gemini at my observatory in north central Illinois. | Orbital parameters courtesy of http://neo.jpl.nasa.gov/orbits/ |
See my other, weather-independent hobby --
http://home.att.net/~dpersyk/horr.htm
My paper on design of embedded piers is here -- http://home.att.net/~dpersyk/Pier_Design.htm
Thanks for looking and for feedback.
Images on the New Images page are changed from time to time, so the next time you return, there may be a different image.
Email comments appreciated at
dpersyk@att.net
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