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Canon Lau

Location of Photo:

Hong Kong

Date/Time of photo:

from 1987 to 2022


1. Celestron C8, Takahashi EM1, Sakura SR1600 colour film, Pentax MX, OR5mm eyepiece. 2. Celestron C14, Gemini G40, Fuji superial 100 colour film, Vixen VX-1, Meade ultra wide 6.7mm eyepiece. 3. Celestron C14, Losmandy G11, Mizar ETL2, Philips ToUcam Pro 740. 4. Celestron C14, Losmandy G11, Televue 2.5x barlow, Philips ToUcam Pro 740. 5. Celestron C14, Losmandy G11, Haoyue 2x barlow, Philips ToUcam Pro 740. 6. Celestron C14, Losmandy G11, Televue 2.5x barlow, Imaging source DBK 21. 7. Celestron C8, Takahashi EM11, Televue 2.5x powermate, ZWO Asi290MM


In 2014, a picture taken with the Hubble Space Telescope showed the Jupiter’s Great Red Spot (GRS) was in fact shrinking. Therefore, I gathered all my past images of Jupiter from 1987 to 2014 to figure out the changes in size of the GRS. As the method of RGB composite image was still foreign to me in 2014, the picture of Jupiter I took back then was still a black and white image. Recently, I replaced the picture taken in 2014 with the one of 2022, which unsurprisingly showed a more apparent shrinking trend of the GRS. 1. All images were taken with Celestron C14 except the first and seventh pictures, which were with C8. 2. All images resized to the same size judging on the diameter of the Jupiter’s South and North Pole. 3. All were composite images, each from several clips processed in WinJupos using the derotation function, except the one in 1987 and 2000, which were a single film; and the one from 2010, which came from a single clip. Back in 1987, shooting Jupiter required 4s of exposure time using the Sakura 1600 film with C8. However, in 2022, the time for a single frame with C8 is 1/124s. With 4 seconds, almost 500 frames could be taken. What an advance in technology! It requires quite a large sum of money, time and efforts to catch up with the advancement!