Celestial hemisphere:  Southern  ·  Constellation: Hydra (Hya)  ·  Contains:  Jupiter's Ghost Nebula  ·  NGC 3242
Getting plate-solving status, please wait...
NGC 3242 Jupiter's Ghost Nebula RGB with Nii  ansae (jets), Sergei
NGC 3242 Jupiter's Ghost Nebula RGB with Nii  ansae (jets), Sergei

NGC 3242 Jupiter's Ghost Nebula RGB with Nii ansae (jets)

Getting plate-solving status, please wait...
NGC 3242 Jupiter's Ghost Nebula RGB with Nii  ansae (jets), Sergei
NGC 3242 Jupiter's Ghost Nebula RGB with Nii  ansae (jets), Sergei

NGC 3242 Jupiter's Ghost Nebula RGB with Nii ansae (jets)

Equipment

Loading...

Acquisition details

Loading...

Description

The body of the nebula and the stars are RGB, SPCC-calibrated and stretched without changing color balance.

I wanted to image the Nitrogen-rich ansae (jets) that are so clear on HST images but have been difficult for me to capture and visualize clearly in previous attempts. Here, I imaged 3nm Nii and Ha, then subtracted Ha from Nii and used this difference as the additional (to calibrated RGB) red signal.

This is also the technique that was used in the reference HST image as well, so kudos to HST researchers who gave me the idea of R += (Nii - Ha). Sometimes log(Nii) - log(Ha) is used instead.

So:
R = R + Nii - Ha
(alternatively, R = R + log(Nii/Ha))
G = G
B = B

Comments

Comments are closed.

Revisions

  • Final
    NGC 3242 Jupiter's Ghost Nebula RGB with Nii  ansae (jets), Sergei
    Original
    NGC 3242 Jupiter's Ghost Nebula RGB with Nii  ansae (jets), Sergei
    D
    NGC 3242 Jupiter's Ghost Nebula RGB with Nii  ansae (jets), Sergei
    E
    NGC 3242 Jupiter's Ghost Nebula RGB with Nii  ansae (jets), Sergei
    F

F

Title: HST reference image

Uploaded: ...

Sky plot

Sky plot

Histogram

NGC 3242 Jupiter's Ghost Nebula RGB with Nii  ansae (jets), Sergei