By Meiying Lee | 2025-10-02
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Comet 3I/ATLAS before passing Mars
On 10/02/2025 11:39 pm by Filipp Romanov | Website | Deep Sky Chile at Rio Hurtado Valley, Chile
I observed interstellar comet 3I/ATLAS (before passing Mars) on 2025-10-02 near 23:39 UT, remotely using iTelescope.Net T75 (0.25-m f/3.8 reflector + CMO) located at Rio Hurtado Valley, Chile (MPC code X07).
In single 180-sec. image with Green filter, I measured the magnitude = +12.5 G (compared using magnitudes of nearby stars from the Gaia DR2 G band).
In stacked 3x60 sec. + 2x180 sec. image, I measured the diameter of the coma = 0.5 arcmin.
Images: color (stacked 3x60 sec. R, G, B) and with false color - for better visibility of coma.
