- 2021-01-04
Terminator change for 4 days
月2021-01-02 23:41(JST) 45cm反射（40㎝に絞る）。 Mon 2021-01-02 23:41 (JST) 45 cm reflector (stop to 40 cm). Terminator change for 4 days. 。
- 2021-01-02
January 1, 2021
Month 2021-01-01 This is the first month of 2021. I think it’s enjoy to follow the changes in the gap due to the phase of the moon every day with a telescope.
- 2021-01-01
Month December 31, 2020
Mon 2020-12-31 2020 is the last month. Excellent transparency, but seeing is bad and you can’t see the details! It’s 2020, where I enjoyed many astronomical phenomena! I hope that 2021 will contain the coronavirus and create a peaceful world. Have a good year! !!
- 2020-12-31
Full moon December 30, 2020
Full moon 2020-12-30 45 cm Newtonian reflector (stopped 40 cm) It is the last full moon in 2020. The full moon in winter rises high and I don’t feel any color.
- 2020-12-31
Uranus December 28, 2020
Uranus 2020-12-28 (UT) The apparent size of Uranus is 3.7 arcsec, which is as small as the size when Mars is farthest away. Good seeing is important when taking. With the IR pass filter, you can see that the Arctic region is bright, and the rest is dark and circular. This time, I took an image of UV and CH4 (methane band) filter for the first time. In order to increase the sensitivity, 2×2 binning was applied and exposure was applied for 1s for UV and 6s for CH4, but no feature was detected. It is a harsh condition, but I want to challenge depending on seeing condition!
- 2020-12-31
Mars December 28, 2020
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.
- 2020-12-28
Jupiter and Saturn are separated December 26, 2020
2020-12-26 Jupiter and Saturn are farther apart. It is about 0.6 °.
- 2020-12-25
Jupiter and Saturn are separated December 25, 2020
2020-12-25 Jupiter and Saturn are separated. It is about 0.45 °. Matsudaira, Hitachiota City
- 2020-12-25
Jupiter and Saturn are conjunction (December 15-23, 9 days)
Those are an image summarizing the progress of the approach between Jupiter and Saturn (December 15-23, 9 days). It fixed and edited Jupiter so that you can see the daily movement. The daily movement, changes in the distance between Jupiter and Saturn, and the accompanying changes in the relative positions and angles of the satellites. It was a wonderful planetary phenomenon that the two planets approached each other, approached each other on 22.23th, and passed each other.
- 2020-12-25
Uranus December 23, 2020
Uranus 2020-12-23 (UT) Image of Uranus because seeing is good. The Arctic region is bright in the IR image. In the color image, a blue-green round disk image (diameter, 3.7 arcsec).