(2000mm) Nucleus Shape Of Comet C/2025 R2 (SWAN) : Astropical

Astropical

This site is for Astronomy Studies in the Tropics. I'm based in East Pattaya, Thailand, 12.934N, 100.918E, between the sun's northern limit and the Equator. The big advantage of this location is that you can observe both northern and some southern stars at the same time. And it's never cold... lol. I hope to introduce you to the unique celestial opportunities available from this area. Enjoy your observations!! Taro Seki Astropical.uk

Nucleus Shape Of Comet C/2025 R2 (SWAN)

"If you're photographing Swan at this time with a 2000mm focal length, wouldn't it be better to excavate the nucleu?" I received this advice from Niigata astronomer Professor Watanabe, so I redid all of the data I shot the other day, starting with the integration.
Another piece of advice I received was, "The nucleus of this comet is currently in a T-shape, which may be visible if you use the Larson-Sekanina filter," so I first focused on editing the T-shape.
Pic 1: No Filter, Color
Pic 2: No Filter, Color Inversion
Pic 3: Color using a Larson-Sekanina filter
Pic 4: Red channel using a Larson-Sekanina filter

「この時期からSwanを2000mmの焦点距離で撮影したなら、核の部分を掘り起こすほうが良いのでは？」
というアドバイスを新潟の天文家の渡辺先生からいただき先日撮影したデータをインテグレーションから全てやり直した。
もう一つのアドバイスに「この彗星の核は今T字になってるのがLarson-Sekaninaフィルターを利用すれば見れる可能性があるよ」ということで、まずはT字に集中して編集して見た。
Pic1:No Filter カラー
Pic2:No Filter 色反転
Pic3:Larson-Sekaninaフィルターを利用したカラー
Pic4:Larson-Sekaninaフィルターを利用した赤チャンネル

Place: Astropical@CSky Observatory Saraburi Thailand (Bortle Class 3, Moon Phase 0.1%)

Shot Date:22nd / Oct / 2025 20:40 (UTC+7)

TS TSRC10T Carbon Truss Prime Focus　(250mm F/8 f/2000mm)

Filter: Aantria V-Pro Lumi, SVbony RGB set

L 30X30Secs Total 15minutes

R: 10X 30Secs Total 5minutes

G: 10X 30Secs Total 5minutes

B: 10X 30Secs Total 5minutes

Total 30minutes

Palette: Target LRGB

Gain: 200 , Offset 5

CCD: Player One Artemis-M Pro Bin2