C/2020 R4 (Atlas)
2021-05-03T21:01:14/21:23:24(+30sec)までの30秒間露光20枚を合成
露光時間：30秒*20=10分00秒 ISO3200 長秒時ノイズリダクションをオン
t-T=+14sec
Mewlon210FR/2050mm + LPS-P2 + 60D / EM200Temma2
StellaImage6.5で合成、レベル補正とリサイズ
2000*1500を切り取り、640*480にリサイズ
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C/2020 R4 From https://www.universetoday.com/150895/catch-comet-r4-atlas-as-it-nears-earth/ Discovered on the night of September 12th, 2020 by the prolific automated Asteroid Terrestrial Impact Last Alert System (ATLAS) sky survey based in Haleakala (ALTAS-HKO) and Mauna Loa (ATLAS-MLO) Hawaii, R4 ATLAS has proven to be an over-achiever. In fact, it was never initially predicted to top +10th magnitude… until a surprise outburst in late December 2020 shot it up 100-fold in brightness, from +18th to +13th magnitude. As of writing this, it sits at about +8th magnitude ‘with a bullet,’ and may top out +7th magnitude this week. Clearly, this is a dynamic comet with lots going on… and one more well-placed outburst this week could nudge it into naked eye territory. The comet reached perihelion on its 957-year orbit on March 1st, 2021 at 1.029 Astronomical Units (AU)(95.7 million miles/154 million kilometers) from the Sun. Had the comet dropped by in August, its passage versus the Earth would have been four times closer.
Physical Parameter Table
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2021年05月03日 10?等