The Stars in  Great Orion Nebula By IR685 (M42,M43) Step 3

(Close project)

This is my first project using IR685 to see how many stars I can capture hidden by the dust around the Trapezium in the Orion Nebula. It's a shame the Trapezium is obscured, but I think I'll have to sacrifice it this time.

The end point is when the number of stars stops increasing.

＊＊＊Star recognition is no longer possible, so the game is temporarily stopped.

Initial Star count: 3394(Star frame exporsure 0.5h)
2nd Star count: 4766 (Star frame exporsure 2.5h)

3rd Star count: 4811(Star frame exporsure 4.5h)

Stars: IR685 (although there are only a dozen or so, the stars HA and Oiii are also overlaid with IR).
Background: HOO.
To count the stars, I used Pixinsight's Star Alignment right after Strech.
Since it's an alignment tool, I'm not sure how accurate it is, but since my goal here is to see how much the number of stars increases with the IR exposure time, I don't need an exact number of stars, I just need a relative count.
The nebula has been processed in HDR to remove dust very hard.

I'll reuse this for the background nebula and add only the IR685 stars.

オリオン星雲のトラペジウム周辺の塵に隠れてる星をどこまで写せるかのIR685でのプロジェクトを初めてみた。トラペジウムが潰れているのが悔しいが、多分今回は犠牲にするしかない。

終着点は星が増えなくなった時。

＊＊＊星の認識が出来なくなり、一旦終了

初回の星数は3394個 (星の露出時間 0.5時間)

2回目の星数は4766個(星の露出時間 2.5時間)

星はIR685 (10数個しかないがHA,Oiiiの星も画像上ではIRと重ねてある)。

背景はHOO。

星のカウントはStrech直後にPixinsightのStar Aligmentを利用。

Aligment用のツールなのでどのくらいの精度か不明だが、今回はIRの露出時間でどれだけ星の数が増えていくかが目的なので正確な星の数ではなく相対的な数を知れれば良い。

星雲はHDR処理で塵を超ハードにワイプしてある。

背景の星雲はこれを使い回し、IR685の星だけ取り増ししていく。

Place: Astropical@CSky Observatory Saraburi Thailand (Bortle Class 3, Moon Phase 13.3%)