ATLAS Photometry of Interstellar Object 3I/ATLAS Article Swipe

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J. Tonry , L. Denneau , M. R. Alarcón , A. Clocchiatti , A. Fitzsimmons , J. Licandro , K. J. Meech , H. Weiland ·

YOU? · · 2025 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2509.05562

We present calibrated ATLAS photometry of the interstellar comet 3I/ATLAS (C/2025 N1) from 28 March through 29 Aug 2025, obtained with the five-site, robotic ATLAS network in the c (420-650~nm), o (560-820~nm), and Teide w (420-720~nm) bands. Stacked difference images yield reliable light curves measured in four fixed apertures that capture the evolving coma. We observe 3I/ATLAS transitioning in color from red (c-o)~0.7 before MJD 60860 to near-solar (c-o)~0.3 after MJD 60870, coincident with the appearance of a prominent anti-solar tail. The absolute magnitude curve H(t) shows a slope break near MJD 60890 at r~3.3 au from -0.035 to -0.012 mag/day, or in terms of coma cross section as a function of heliocentric distance, r^{-3.9} to r^{-1.1}.

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Type: preprint
Language: en
Landing Page: http://arxiv.org/abs/2509.05562
PDF: https://arxiv.org/pdf/2509.05562
OA Status: green
OpenAlex ID: https://openalex.org/W4416219567

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OpenAlex ID: https://openalex.org/W4416219567

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DOI: https://doi.org/10.48550/arxiv.2509.05562

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Title: ATLAS Photometry of Interstellar Object 3I/ATLAS

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Type: preprint

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Language: en

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Publication year: 2025

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Publication date: 2025-09-06

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Authors: J. Tonry, L. Denneau, M. R. Alarcón, A. Clocchiatti, A. Fitzsimmons, J. Licandro, K. J. Meech, H. Weiland

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Landing page: https://arxiv.org/abs/2509.05562

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PDF URL: https://arxiv.org/pdf/2509.05562

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Open access: Yes

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Cited by: 0

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