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天王星の見かけの大きさが3.7秒角と火星が最も遠ざかった時の大きさと同じくらい小さい。
撮る時は気流の良さが大切です。IRパスフィルターでは北極地方が明るく、それ以外は暗く、円形が分かります。
今回、初めてUVとCH4（メタンバンド）フィルターを撮像してみました。感度上げるために2ｘ２ビニングしUVでは1s、CH4では6sの露出を掛けましたが模様の検出は無しでした。厳しい条件ですが気流次第では挑戦したいです
撮る時は気流の良さが大切です。IRパスフィルターでは北極地方が明るく、それ以外は暗く、円形が分かります。
今回、初めてUVとCH4（メタンバンド）フィルターを撮像してみました。感度上げるために2ｘ２ビニングしUVでは1s、CH4では6sの露出を掛けましたが模様の検出は無しでした。厳しい条件ですが気流次第では挑戦したいです
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!
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!