While organizing old CDs, a digest image of a 20th century planet came out. It is a combination of 32 cm newtonian+ cooled CCD (Teleris). In the era when there was no digital camera for astronomical colors, all colors were RGB composites. It was around the time when the Great Red Spot on Jupiter was pale. The quality is one rank lower than it is now, but I remember the bright vitiligo that looked like Saturn’s EZ.
Mars 2021-03-29 It is almost unobserved Mars. The apparent diameter is 5.4 arcseconds. I got the aperture of 45 cm to 40 cm and saw a faint feature at 600 x. The image is distorted due to the seeing. In the UV image, the white ones on the north and south sides are like clouds.
Mars 2021-03-03 (UT) In March, Mars has already passed its zenith in the evening and is lined up near M45 (Subaru) in the western sky. The visual diameter of Mars has decreased to the 6-second range and the observation season is over, but the feature can still be captured depending on the airflow. Aurorae sinus and Solis lacus can be seen in the Martian feature. (Stopped 45cm Newtonian to 30cm)
Mars 2021-01-09 (UT) The apparent diameter is 9.6 arcsec, which is smaller and does not capture the SPC or details. Clouds that look like polar clouds can be seen around the north side.
Mars 2020-12-28 (UT) In the evening, Mars moves southward, so it overlaps with my daily life and I am busy. The feature of Mars is around 0 degrees longitude, and the appearance of the feature pattern has returned to its original state. The apparent diameter of Mars is now 10 arcseconds. It will continue to be observable in the evening sky until April next year (diameter 5 arcsec), but it will be severe in winter when seeing condition is bad.
Mars 2020-12-23 (UT) Mars after a long time, Seeing is a little good, the longitude after the dust storm. You can barely see the SPC. There is white cloud or fog on the north side. The area around the north is the Arctic clouds. The apparent diameter is as small as 11.4 arcseconds.
小さくなった火星、視直径は13.3秒角。 冬型の悪い気流が多くなり、火星面の大きな模様だけが捉えるだけです。南極冠は悪気流で見えません。 Mars 2020-12-09 (UT) Mars has become smaller, and its apparent diameter is 13.3 arcseconds. There are many bad winter seeing, and only the large feature on the surface of Mars can be captured. SPC is invisible due to poor seeing.
Mars 2020-11-13 (UT) The dust storm that occurred on the 12th is bright.
Mars 2020-11-05 (UT) The morning of Mars was missing from the circle, and the apparent diameter became as small as 19 arcseconds. The clouds on Mt. Tharsis in the evening are bright. In the morning, the morning mist hangs in a low place. In the Martian season, the Southern Hemisphere progresses from summer to autumn, with increased water vapor and mist and clouds.
This is a depressing Mars image with many clouds. The white clouds around the evening sky (on the right side of Mars) are the clouds of Mount Tarsis.