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I captured two ISS transits of The Sun on the weekend of 12-13th June 2021. Both images and videos were taken with my Lunt Systems T60Ha Hydrogen Alpha telescope and ASI174MM camera. ISS Transit at 15:05.14 on Saturday 12th June 2021 The transit above was not quite visible from my back yard and so I had to put all the gear into the car and drive to about three miles from where I live. I set up about 20 minutes early to ensure I was ready to capture the data for the image above. I was not quite located exactly where the ISS crossed the precise diameter of the sun – I was about 300m away! Yes, a very small change of position on the Earth’s surface really does make that much difference to the visible track of the ISS across the face of the sun. The ISS was about…

The Sun, 16 June 2021 at 13:10 UK time, Lunt 60Tha and ASI174MM This is a 10000 frame capture of the Sun with good seeing at 13:10 UK time in Nottingham. I used my Lunt 60Tha and my ASI174MM camera at 16-bit and 65 fps. The day was very hot – by UK standards – at about 28C and quite humid. I was able to use 92% of the frames which I stacked in Autostakkert. Post processing in IMppg and Photoshop CC. The image capture is a full disk and disk and proms are from the same capture. Black and White version

Images on this post were made by using the TEC140 and Celestron C925 SCT telescopes with my ASI174M mono camera. From my backyard in Nottingham on the evening of 25th March 2021 with the Moon high to the south in Leo at a phase of 86% waxing (i.e. growing towards full moon) and at an altitude of about 50 degrees above the horizon. A slightly hazy sky made for quite good seeing although it was very cold and windy and the moon was jiggling about a lot in the gusts, even inside my sheltered observatory. I had to try and time my capture runs between these gusts and passing clouds, a process that was not always successful. As a consequence I accumulated nearly 600G data for these four pictures in total, much of which had to be deleted. I was outside at the scope for about 90 minutes doing these…

A selection of four images I took with my two main telescopes on the evening of the 24th March 2021 with The Moon at 78% waxing gibbous phase to the South in the constellation of Leo. First up below is a main disk taken with TEC140 refractor. I shot RGB through those filters on my ASI174M camera and I took the luminance through a 7nm Ha filter. My field of view with the TEC140 and this camera is only half the disk and so I have to take sequence runs, one for the north and the other for the south and then combine them in Photoshop. Lunar Disk I then moved on to use my C925 SCT telescope again using the ASI174M in RGB mode. I did not capture a specific luminance channel this time and just used RGB and made a pseudo luminance. The weather conditions were too windy…

I have owned my Celestron C925 SCT telescope for many years but have only ever used it for visual purposes. I have always preferred the use of refractors for imaging. However, I have started to want to get much greater detail in my lunar images, having been bitten by the lunar imaging bug. I had some significant issues getting the C925 properly collimated, accurate enough for imaging purposes, a story I discuss here. After successfully collimating the scope these are my first two pictures taken with The Moon quite low down in the East with some slight mistiness. Mare Nectaris Region Above is the best 15% of 5000 frames in each of Red, Green and Blue. I collected the data with Sharpcap with ASI174M camera with Baader RGB filters. I created the master R,G,B files with PlanetarySystem Stacker and then used PixInsight and Photoshop to develop. Copernicus Above is Copernicus…