The rotational gradient, also called Larson Sekanina filter, is a filter that allows the removal of circular structures from an image, to enable other details to be highlighted. This technique is particularly effective in showing the jets coming out of the nucleus of a comet. Taken on 7th November 2007.

Comet Holmes is a periodic comet in the Solar System, discovered by the British amateur astronomer Edwin Holmes on November 6, 1892. Although normally a very faint object, Holmes became notable during its October 2007 return when it temporarily brightened by a factor of a million, in what was the largest known outburst by a comet, and became visible to the naked eye. Taken on 7th Nov 2007

Took a few images of the Minor Planet Pallas over a few hours on 04/8/2000 and blinked two of them. The movement in that time against the background of stars is evident.

The planet Neptune has 16 known moons, which are named after minor water deities and a water creature in Greek mythology. By far the largest of them is Triton, It can be seen that Triton has moved around its orbit since the previous image 10 days earlier. Taken 20/10/2000

I had to overexpose the planet Uranus to capture the five main moons Miranda, Ariel, Umbriel, Titania, and Oberon. The moons are sometimes called the "literary moons" because they are named after Shakespearean characters. It has a total of 27 moons but too faint for me to see at the moment. Taken on 9/10/2000

A difficult object on which to focus

Used my Imaging Source webcam to take this and used Registax 6 to combine the best 320 out of 800 frames. My best result yet! On 6/3/2020

Took a few images of Jupiter over a short period and created this sequence, showing the Red Spot rotating with the planet. Feb 19th 2004

Another attempt to beat the poor seeing. Feb 28th 2016

This one at 02.35. Great Red Spot has rotated around Jupiter somewhat. Feb 28th 2004

Same image as below but with a Larson-Sekanina filter applied to bring out the faint details. 26th May 2004

Taken on 26/5/04 at 00.14 U.T. 25 x 1 minute tracked on the comet using an HX516 camera on my 80mm guidescope. Some haze. A definite greenish tinge to the comet. Cropped in Photoshop. May 26th 2004

Another attempt to beat the seeing. The best 32 out of 50 images taken at exposure of 0.1 Sec, binned 2x2 on 7/8/2003 at 22.50 UT. Processed hard in AA3. CM is 215 Degrees

The best 20 out of 60 images at 0.1 Sec binned 2x2 working at f70. Imaged on 5/9/2003 at 22.06 U.T. I don't think I'm going to get any better than these as the seeing and low altitude are against me. Stacked and processed in AstroArt 3. I don't think I'm going to get any better than these as the seeing and low altitude are against me. Stacked and processed in AstroArt 3I don't think I'm going to get any better than these as the seeing and low altitude are against me. Stacked and processed in AstroArt 3. CM is 223

The best 18 out of 50 images taken on the night of 29/8/03 at 22.23 U.T. Individual exposure was 0.1 sec., binning was 2x2, stacked and processed using AA3. CM is 289, Hellas and Syrtis Major visible

Mars taken with MX7C on 28/8/03 at 00.25 U.T. Stack of 40 images each of 0.11 sec exposure binned at 2x2 and processed in AA3. Taken with LX200 10 using a TeleVue PowerMate 5X giving a measured f70. Seeing very poor at an elevation of 20 deg

Mars taken at 23.30 U.T on 27/8/03. best 40 out of 50 exposures each of 0.2 Sec, stacked and processed with AA3. Taken with LX200 at f70

Again taken at f70 on 27/8/03 at 22.25 U.T.but this time using an exposure of 0.01 sec to try to beat the poor seeing. The best 40 out of 55 exposures stacked and processed in AA3

Mars taken with MX7C at f30 on 8/8/03 at 00.15 UT. Stack of 30 images 2x2 binned and 0.01 sec. Processed in AA3 using LX200 at f35

Jupiter with Europa and its shadow on left and Io on right. Exposure of 0.05 sec at f30 with HX516. July 21st 2003

Mars on 17th Nov 2005 at 20.11 UT. Both tis and the image below were taken at f20 through the LX200. Camera was in RAW mode. Images taken with Astrosnap and processed with Reistax 3. A notable improvement compared with my fist attemps at webcamming as can be seen at the bottom of this page.

Mars on 13th Nov 2005 at 21.00 UT

Waited up till 3am on the 28/2/04 hoping for some good seeing but no luck. I captured these two while passing the time. This one was at 01.55 UT.. The Great Red Spot can be seen to have moved across the disc in that time. Both were at f25, the first was the best 270 of 750 frames and the other was the best 260 from 770 frames. Acquired with K3CCDtools and processed with Registax.

After a few poor attempts at capturing Jupiter, I managed this one on 12/2/04 at 00.16 U.T. The best 650 from 700 frames. Settings were 5fps, brightness 100, gain 0, exposure 1/25. Focusing was fairly precise. The main drawback was the seeing which was only average

A bit more care with this one together with some better seeing. The same setup as before but taken on 9/2/2004 at 00.27 U.T.

I'm getting the hang of this webcam. these two images of Saturn were taken on successive nights of 16th and 17th January 2004. Attached to a Barlow lens and my 250mm LX200 at an effective f30, I took a sequence of frames using K3CCDTools and then processed the images with Registax. The settings for both were: 5fps, Format 352x288, Brightness 100, Gamma 0, Saturation 50, White balance on automatic, Exposure 1/25 and Gain 30 The adjacent image was processed from the best 800 framesof 1200 and the one below was the best 900 frames from 1150. A notable improvement on my previous attempts.

Saturn taken on 25/10/03 and is the best 420 from 640 images taken with the ToUcam Pro. 1/25th sec exposure and 10 frames per sec. Taken at f25 using the LX200 with a Barlow

This was my first attempt and is made up of a stack of the best 560 images taken with a Philips TouCam Pro camera at 1/25 sec exposure and at 10 frames per second. Gain was set to zero and brightness to 100%.Taken through my 10 LX200 telescope. 29th Sept 2003

Pluto between 10/8/05 and 16/8/05. Pluto images taken on 10th August and 16th August 2005 and show the motion of Pluto between those dates. The bright object near the centre is SAO160548 which is at mag 8.2. Pluto itself is at mag 13.9 but still very visible. The images were 4 minutes of luminance taken with the SXV-H9 camera through My LX200 at f8.

Still not very happy with my processing but still able to capture the tail etc. Taken through a 300mm camera lens at f8, piggybacked on my LX200., on 23rd January 2005 and imaging began at 19.50 UT. LRGB using 20x2:3x5:3x5:3x5 mins all binned 2x2 with final crop in PS