The Kemble's Cascade aka The Kemble's Water Fall (Asterism)
A cascade of about 20 stars located northwest of NGC1502 (Jolly Roger Cluster) in the constellation Camelopardalis.
I had wanted to photograph this for a while, but I forgot and couldn't.
To be honest, I thought it would be an easy target, but I was completely wrong.
There are many relatively bright stars, so I realized by looking at the stacked images that the cascade was difficult to recognize because it was buried in the other stars.
Before shooting, Chol, a close friend of stars, told me, "Taro, the cascade won't come out easily," and he was right.
It felt strange to apply a mask to separate the bright and faint stars and adjust the levels, so I adjusted the levels little by little so that the cascade would come out.
I thought that with my equipment, it would probably be better to make the overall exposure time longer and process the cascade so that the spikes of the cascade stars would be clearly visible.
I had wanted to photograph this for a while, but I forgot and couldn't.
To be honest, I thought it would be an easy target, but I was completely wrong.
There are many relatively bright stars, so I realized by looking at the stacked images that the cascade was difficult to recognize because it was buried in the other stars.
Before shooting, Chol, a close friend of stars, told me, "Taro, the cascade won't come out easily," and he was right.
It felt strange to apply a mask to separate the bright and faint stars and adjust the levels, so I adjusted the levels little by little so that the cascade would come out.
I thought that with my equipment, it would probably be better to make the overall exposure time longer and process the cascade so that the spikes of the cascade stars would be clearly visible.
きりん座のNGC1502(Jolly Roger Cluster)の北西にある20個程度の星の並び。
以前から撮影したかったが、忘れてしまい撮影できなかった。
正直に言うと簡単な対象だなと思って撮影を始めたが、完全に考えが甘かった。
比較的明る星が多いところなので、そのらの星に埋もれてしまいカスケードを認識し辛いことがStack後の画像を見て判った。
撮影前に星の親友であるCholさんからも「太郎、簡単にはカスケードは浮かんでこないよ」と言われていたが、その通りだった。
マスクをかけて明るい星と暗い星を分けてレベル調整するのは違和感があるので、少しづつカスケードが浮かび上がってくる様にレベル調整をコツコツ行った。
きっと私の機材の場合、もっと全体の露出時間を長くして、カスケードの星にスパイクが明確に出る様な処理でカスケードを浮かび上がらせる方が正解だなと思った。
Place: Astropical@CSky Observatory (Bortle Class 3, Moon Phase 40.5%)
Shot1 Date:6th / Jan / 2025 23:31 (UTC+7)
2 Panels Mosaic
Filter: Baader SemiAPO
Panel1:SmiAPO: 10X 180Secs Total 30 minutes
Panel2:SmiAPO: 10X 180Secs Total 30 minutes
Total 1 Hours
CCD: QHY294C Pro 11Mega Mode BIN1
Mount :iOptron CEM70G
Guide: OAG Z61 61mm F/5.9, QHY290C.
Controler: NINA Dither, PHD2
Pre-Processing APP Drizzle None
Post-Processing PI,PS
Shot By Taro Seki Astropical.uk
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