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Observation by nhaigh: Final stack (!) with a subtraction of a ...

Uploaded by

BAA Comet Section

Observer

nhaigh

Observed

2025 Jul 02 - 22:07

Uploaded

2025 Jul 03 - 23:54

Objects

0003I

Full filename

3i/3i_20250702_220800_nhaigh.jpg

Target name

0003I

Title

Final stack (!) with a subtraction of a nearby star, showing a faint halo ~10" across around it. Both stacked astrometrically in ASTAP, using the ephemeris for the comet, so instrumental PSFs should be identical. Subtracted star was scaled such that the residuals showed a dip in brightness in the middle to ensure I was fully subtracting the nucleus, hence it being a vague doughnut.

About this image
Final stack (!) with a subtraction of a nearby star, showing a faint halo ~10" across around it. Both stacked astrometrically in ASTAP, using the ephemeris for the comet, so instrumental PSFs should be identical. Subtracted star was scaled such that the residuals showed a dip in brightness in the middle to ensure I was fully subtracting the nucleus, hence it being a vague doughnut.
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