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From out of the blue, or should I say From out of the black skies of Arizona, I have received a wonderful package of tri-color CCD images which I just have to post in their entirety. Arizona astro-imagers Tim Hunter and James McGaha, who are fortunate enough to observe from dark skies, also make use of an 24" f/5 reflector located in Tim's Grasslands Observatory (It doesn't get much better than that!). There are a total of fifteen images of planetary nebulae to post, and since some of the image file sizes are moderately large, I will again utilize the multi-page format to present them, so that page load time will not be excessive, and yet keep the image quality. Some of the images have been cropped to reduce load time, but resolution has not been reduced from the original.
The images on this and following pages are tri-color CCD images through Photometric filters, R (red), V (visual), and B (blue). Also included are two images in which the R filter has been replaced with an I (infrared) filter. Typical exposures for the R and V images were 60 seconds, and for the B images, 90 secconds. The images were obtained with an Apogee AP7 camera mounted on a 24 inch, f/5 reflector.
| Images By Tim Hunter and James McGaha | ||||
| IC4406 | IC 4406 (Infrared) | M27 (Dumbbell) | NGC2438 | M57 (Ring) |
| M97 (Owl) | NGC2392 (Eskimo) | NGC246 | NGC3242 (Ghost) | NGC40 |
| NGC4361 | NGC 4361 (Infrared) | NGC6445 | NGC7008 | NGC7293 (Helix) |
| IC 4406 In Lupus Using R, V, B filters. Size: 100" x 37" (arcseconds); Magnitude 10.6. Notice faint outer shell visible in this image. |
IC 4406 In Lupus Using I, V, B filters. Note reddening of several (cooler) stars when imaging in infrared. The PN responds to V and B filters, thus the blue-green color. |
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| The Helix Nebula, NGC 7293 (Aquarius). Size: 900" x 700" (arc-seconds), Magnitude: 7.5 (But surface brightness is a dim 13.6 mg/sq. arcmin.) |
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Planetary Nebulae Observer's Home Page
Doug Snyder, December 1998