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Palomar Optical Spectrum of Hyperbolic Near-Earth Object A/2017 U1

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arxiv 1710.09977 v2 pith:FFL7DHRX submitted 2017-10-27 astro-ph.EP

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keywords opticalhyperbolicnear-earthobjectpalomarveryabsorptionalthough
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We present optical spectroscopy of the recently discovered hyperbolic near-Earth object A/2017 U1, taken on 25 Oct 2017 at Palomar Observatory. Although our data are at a very low signal-to-noise, they indicate a very red surface at optical wavelengths without significant absorption features.

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Cited by 1 Pith paper

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  1. Precovery Observations of 3I/ATLAS from TESS Suggests Possible Distant Activity

    astro-ph.EP 2025-07 conditional novelty 6.0 of 10

    Archival TESS images show 3I/ATLAS was brighter than distance effects alone can explain, implying possible cometary activity at ~6 au from the Sun.

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