Neptune And Its Moon Triton
As soon as I saw the JWST photo of Neptune, I noticed a beautiful star several times brighter than Neptune shining nearby.
To my surprise, it wasn't a star, but Neptune's moon, Triton.
My interest piqued, so I looked into it and found out that while Neptune's atmospheric methane absorbs light, Triton's surface is covered in ice, making it extremely reflective, and so Triton appears brighter in infrared images.
Of course, my equipment and filters only allow me to shoot in RGB, so Neptune appears brighter.
Looking at various photos of Neptune, I knew Neptune was blue, but I learned that Triton is reddish.
I wanted to see the blue and red parent-child stars, so I took some photos.
The magnitudes are
Neptune: 7.9
Triton: 13.5
There's quite a big difference, so I took the photos and stacked them several times, trying to find settings that would allow Neptune to appear blue without being blown out and Triton to appear red.
Even so, I still had to increase the saturation quite a bit to bring out Neptune's color.
During integration, the image was enlarged by 3x using Drizzle, and during post processing, the image was enlarged by 180% and 5.4x using re-sampling.
To my surprise, it wasn't a star, but Neptune's moon, Triton.
My interest piqued, so I looked into it and found out that while Neptune's atmospheric methane absorbs light, Triton's surface is covered in ice, making it extremely reflective, and so Triton appears brighter in infrared images.
Of course, my equipment and filters only allow me to shoot in RGB, so Neptune appears brighter.
Looking at various photos of Neptune, I knew Neptune was blue, but I learned that Triton is reddish.
I wanted to see the blue and red parent-child stars, so I took some photos.
The magnitudes are
Neptune: 7.9
Triton: 13.5
There's quite a big difference, so I took the photos and stacked them several times, trying to find settings that would allow Neptune to appear blue without being blown out and Triton to appear red.
Even so, I still had to increase the saturation quite a bit to bring out Neptune's color.
During integration, the image was enlarged by 3x using Drizzle, and during post processing, the image was enlarged by 180% and 5.4x using re-sampling.
JWSTの海王星の写真を見たら海王星よりも何倍も明るい星が近くで綺麗に輝いていた。
なんとそれは恒星では無く海王星の月であるトリトンだった。
興味が湧いてきて調べたら海王星は大気のメタンが光を吸収してしまうのに対してトリトンは氷が表面にありめちゃくちゃ反射率が高く、赤外線で撮るとトリトンは明るく写るそうだ。
もちろん私の機材とフィルターではRGBでしか撮れないので海王星の方が明るく写る。
色々海王星の写真を見てみると海王星が青いのはもちろん知っていたがトリトンは赤っぽいことを知った。
青と赤の親子の星を見たくなり撮影して見た。
等級は
海王星：7.9
トリトン：13.5
とかなり差があるのでスタック後も海王星が白飛びしないで青く写り、トリトンが赤く写る設定を探して何度か撮影とスタックを繰り返した。
それでも海王星の色を出すのにかなり強く彩度を上げてある。
Integration時にDrizzleで3倍、Post Processing時にRe-samplingで180％、5.4倍の拡大をかけてある。
Place: Astropical@CSky Observatory Saraburi Thailand (Bortle Class 3, Moon Phase 1.8%)
Shot Date:5th / Jan / 2026 19:53 (UTC+7)
TS TSRC10T Carbon Truss Prime Focus (250mm F/8 f/2000mm)
Filter: SVbony RGB set
R: 25X 1Secs Total 25secs
G: 25X 1Secs Total 25secs
B: 25X 1Secs Total 25secs
Total 1minutes 15secs
Palette: Target RGB
Star RGB
Gain: 200 , Offset 5
CCD: Player One Artemis-M Pro Bin2
Mount :iOptron CEM70G
De-Rotator : Wanderer Mini V2 (0 Deg)
Guide:None
Controler: NINA
Pre-Processing APP Drizzle Droplet 0.9 Scale 3.0
Post-Processing PI,PS (Re-sampling 180%)
Shot By Taro Seki Astropical.uk
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