Ne Interstellar Comet 3I/ATLAS

[theskyhound]

Hi Dennis,

Good to hear from you again. That's a very nice image you've got there. The comet is easy to see at 17 magnitude with only a 60 sec exposure.

Thanks,

Phil S.

Thanks Phil, we’ve had a cloudy few weeks down under which is unusual for our winters in Brisbane.

This is C/2025 N1 (ATLAS) as recorded from Brisbane on 16th August 2025.

I processed a stack of 19x60 sec frames in Tycho Tracker and then up-sampled the cropped region by x2 in Photoshop using an AI based re-sizer (ON1).

There is “fuzziness” around the comet, but I am uncertain if this is the coma, a stacking artefact or just “drift” as these were 60 sec unguided frames at 2800mm focal length.

The “fuzziness” extends for approx. 9x9 arc secs and does not appear to be elongated like the classical tail.

Dennis.

Center RA (2000.0): 16h 09m 25.48s
Center Dec (2000.0): -16° 10' 11.2"
Scale: 0.5520 arcseconds/pixel
Position Angle: 180° 12' from north through east




FWHM: 3.41 pixels, 1.88 arcseconds

Hi Dennis,

May I used your images on my Comet Chasing youtube channel. I will attribute.