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The Atacama Cosmology Telescope: Millimeter observations of a population of asteroids or: ACTeroids

Orlowski-Scherer, John, Venterea, Ricco C., Battaglia, Nicholas, Naess, Sigurd, Bhandarkar, Tanay, Biermann, Emily, Calabrese, Erminia ORCID:, Devlin, Mark, Dunkley, Jo, Hervías-Caimapo, Carlos, Gallardo, Patricio A., Hilton, Matt, Hincks, Adam D., Knowles, Kenda, Li, Yaqiong, McMahon, Jeffrey J, Niemack, Michael D., Page, Lyman A., Partridge, Bruce, Salatino, Maria, Sievers, Jonathan, Sifón, Cristóbal, Staggs, Suzanne, van Engelen, Alexander, Vargas, Cristian, Vavagiakis, Eve M. and Wollack, Edward J. 2024. The Atacama Cosmology Telescope: Millimeter observations of a population of asteroids or: ACTeroids. Astrophysical Journal 964 (2) , 138. 10.3847/1538-4357/ad21fe

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We present fluxes and light curves for a population of asteroids at millimeter wavelengths, detected by the Atacama Cosmology Telescope (ACT) over 18,000 deg2 of the sky using data from 2017 to 2021. We utilize high cadence maps, which can be used in searching for moving objects such as asteroids and trans-Neptunian Objects, as well as for studying transients. We detect 170 asteroids with a signal-to-noise of at least 5 in at least one of the ACT observing bands, which are centered near 90, 150, and 220 GHz. For each asteroid, we compare the ACT measured flux to predicted fluxes from the near-Earth asteroid thermal model fit to WISE data. We confirm previous results that detected a deficit of flux at millimeter wavelengths. Moreover, we report a spectral characteristic to this deficit, such that the flux is relatively lower at 150 and 220 GHz than at 90 GHz. Additionally, we find that the deficit in flux is greater for S-type asteroids than for C-type.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Additional Information: License information from Publisher: LICENSE 1: URL:, Type: cc-by
Publisher: American Astronomical Society
ISSN: 0004-637X
Date of First Compliant Deposit: 27 March 2024
Date of Acceptance: 22 January 2024
Last Modified: 27 Mar 2024 10:00

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