Jupiter 2021-04-30 (UT) At dawn, it was fine and transparent, but it was a poor seeing. I could observe Jupiter and GRS, so I forced myself to take an image. It became brighter and the seeing recovered a little, but it was late and disappeared into the blue sky.
Humboldt. The crater chain towards the center is not known in this phase, but there is a valley near the outer wall on the south side. It’s a tough phase 2021-04-27 45cm F / 4 newtonian x2 IR-685 ASI290MM
Jupiter 2021-04-27 (UT) There are low-altitude haze and clouds, the transparency is poor, the brightness of Jupiter changes, and the seeing is also bad. GRS can be seen on the far left.
Jupiter 2021-04-24 (UT) Jupiter at dawn has reached an observable height. The altitude in the south and middle is as low as 41 ° this year, but I want to be blessed with good airflow. On the Jupiter surface, the density of redness is high from NEB to EZc, and they are connected in the UV image. SEB is faint depending on longitude. CH4 (methane band) filter changed to ZWO. I would like to expect a short exposure of 100-150ms.
Veil Nebula 2021-04-23 45 cm F/4 Newtonian I took a picture of the Veil Nebula (Veil Nebula, NGC 6992-5, NGC 6960) before observing Jupiter. Since it is a large diffused nebula, it is a part of the field of view, but it is a beautiful color of red, blue . Weak image processing suppresses contrast and adjusts to gentle colors. It was a low altitude image in the twilight, but next time I would like to take it at the zenith position! The bright eastern side is NGC 6992-5 (C33) and the western side is NGC 6960 (C34), and it is thought that the gas of the supernova remnant that exploded tens of thousands of years ago is spreading at 100 km / s (Wikipedia (Wikipedia)
Video M8 2021-04-21 Seeing condition was poor, but the transparency was good, so I took a video of the Lagoon Nebula in Sagittarius (ISO102400, 1/4 second)（with BGM). The camera of the IR modified has a high sensitivity of red, and it looks better than it looks visually. It is an image without color with the UHC filter. The change in atmospheric fluctuations and the feeling of passing artificial satellites are the expressive power of movies!
2021-04-17 The weather was bad at the astronomical observation party at the Oarai Sun Beach tsunami evacuation facility, so we only talked indoors. We can’t read the spring weather!
M20 2021-04-15 45cm F4 1m x 20 frames The transparency was good, but seeing was bad and the star image was large.
C / 2020 R4 ATLAS 2021-04-15 03:04 (JST) 45cm F4 Newtonian 30s exposure x 4 sheets It became transparent after the rain. The airflow is bad and the stars image is big.
I god a red LED ballpoint pen from an acquaintance. A little light is useful for astronomical observation at night!
