Comet 3I/ATLAS
Taken by Mieczyslaw Leszek Paradowski on December 16, 2025 @
Lublin, Poland
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Camera Used: Unavailable Unavailable
Exposure Time: Unavailable
Aperture: Unavailable
ISO: Unavailable
Date Taken: Unavailable
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Details:
Exposure: 72x30s - integration time 36 min. Tracker mount: Star Adventurer. Processing: DeepSkyStacker, IRIS - written by Christian Buil, GIMP. All calibrated frames (darks, bias, flats) were stacked on stars and the comet. Aperture photometry of the comet performed in IRIS. Measured total magnitude mC=10.15 +/-0.02 mag, magnitude in V band mV=10.19 +/-0.02 mag @Dia=3.0'. Tail: 6.7' in p.a. 102 deg.
Effective diameter of the comet's nucleus is 2.5 +/-0.2 km assuming phase coefficient 0.040 +/-0.005 mag/deg and albedo 0.02. Bulk density of the nucleus is 420 +/-60 kg/m3 assuming absolute total magnitude (coma + nucleus) 5.8 +/-1.0 mag.
The size and bulk density of the nucleus are estimated using my methods that were published in Monthly Notices of the Royal Astronomical Society, Volume 492, Issue 3, March 2020 Pages 4175-4188, https://doi.org/10.1093/mnras/stz3597 and Acta Astronomica Vol. 72 (2022) pp. 141-159 doi:10.32023/0001-5237/72.2.4, respectively.
Photographer's website:
No URL provided.
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