Some more CCD Images.

M17 M42 M20

Images last updated 2005/01/07

This is a continuation of my CCD images. The first page shows images mostly from my 20-cm f4·5 Newtonian while most of these images are from my new 30cm f/5 Newtonian. It yields a field of view of about 14·5 × 10·8 arcminutes. Pixels are 2·31 2·69 arcseconds, but have been resampled for these images so that they appear square. These images are JPEG compressed so some loss of detail has occurred. This is unavoiadable if I am to keep lots of images on-line. The TIFF files are somewhat larger.

More information on how I process images is here.

The images are presented in reverse chronological order - the oldest images are last, with the newest ones added at the top of the list.

NGC 6302
(56kB)
A bright bi-polar planetary nebula - also known as the bug nebula.
NGC 6334
(58kB)
Just one of the cat's paw's.
NGC 55
(27kB)
A long, thin, asymmetric galaxy. Note the background cluster to the lower right. Shown at half scale.
NGC 300
(29kB)
Just the inner portion of this large and detailed, but low surface brightness galaxy. (Shame about those bright stars!)
NGC 253
(48kB)
Another big mosaic - but halved for this view. The detail in the original is delicious. The mosaic is in 4 parts, with each part being the sum of 3, 2 minute exposures.
NGC 247
(29kB)
Another big galaxy mosaic - again halved for this view. The sum of 3, 2 minute exposures, with a 3-part mosaic to cover the field. This is a much fainter galaxy than its famous neighbour NGC 253 (shown above).
47 Tuc (NGC 104)
(59kB)
The sum of 12, 15 second exposures showing the inner portions of this spectacular globular. This object is always so hard to display because of its dynamic range. The centre is (just) saturated while the faintest stars barely above the sky background. The scaling makes the star images appear bloated.
NGC 6822 (Barnard's Galaxy)
(46kB)
This large, but LSB galaxy is always difficult to display. A mosaic in 2 parts, with each half the sum of 5, 2 minute exposures.
NGC 4945
(37kB)
A two part mosaic, with each half being the sum of 3, 2 minute exposures. A very nice galaxy with lots of detail visible. This image is shown at half resolution.
R CrA region
(24kB)
This gorgeous field is the sum of 14, 15 second exposures. The variable star R CrA is at lower left, surrounded by nebulosity (NGC 6729) with the brighter NGC 6726 north-west, around the 7th magnitude A0 star. Note the lack of background stars due to the presence of a very dark cloud. Visually, this field is magnificant containing something for every taste.
IC 2948
(45kB)
H-alpha Covering over ½°, this image is a twelve part mosaic being the sum of 2 minute exposures through a H-alpha filter (taken around full moon!). A large patch of nebulosity with several large Bok globules, and the open cluster Col 249 in the foreground. The image is shown at half resolution.
NGC 3195
(20kB)
With a declination of -81°, this small and relatively unknown planetary nebula doesn't even have a listed magnitude! If it were in the northern hemisphere it would be listed as a "must see" object.
NGC 4755 (the Jewel Box cluster)
(67kB)
The sum of 30, 1 second exposures. I tried this as an experiment and it seems to have worked reasonably well. There were still clouds around when I did this as well, so I'm surprised that there are no halos around the bright stars.
Comet 1999 H1 (Lee)
(20kB)
The sum of 10, 1 minute exposures, shifted to align on the comet nucleus. Taken on 1999/06/04 starting at 08:33 UT. There is much detail in the tails now. The star spots dim towards the right as some clouds appeared during the sequence. This image has had the gain turned up a little.
Comet 1999 H1 (Lee)
(21kB)
The sum of 10, 1 minute exposures, shifted to align on the comet nucleus. Taken on 1999/05/19 starting at 09:44 UT. The ion tail shows up nicely now. This image has had the gain turned up a little.
Cen A (NGC 5128)
(51kB)
The sum of 6, 2 minute exposures, taken right after the M83 shot below.
M83
(48kB)
Just minimal baffling, but at least I could guide. The sum of 5, 2 minute exposures. Definetely better than the 20-cm version, in my opinion.
Eta Carina
(34kB)
The telescope didn't have a finder, let alone a guider or any baffling, but I just had to try it out. This image is the sum of 7, 15 second exposures (not even flat fielded).

home back to Cookbook CCD to image processing


Page last updated 1999/09/06
Steven Lee