Asteroid Measurements at Millimeter Wavelengths with the South Pole Telescope

We present the first measurements of asteroids in millimeter wavelength (mm) data from the South Pole Telescope (SPT), which is used primarily to study the cosmic microwave background (CMB). We analyze maps of two \(\sim270\) deg\(^2\) sky regions near the ecliptic plane, each observed with the SPTp...

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Veröffentlicht in:	arXiv.org 2023-04
Hauptverfasser:	Chichura, P M, Foster, A, Ossa-Jaen, N, Ade, P A R, Ahmed, Z, Archipley, M, Avva, J S, Balkenhol, L, Barry, P S, R Basu Thakur, Beall, J A, Benabed, K, Benson, B A, Bianchini, F, Bouchet, F R, Bryant, L, Byrum, K, Carter, F W, Cecil, T W, Chang, C L, Chaubal, P, Chen, G, Chiang, H C, T-L Chou, Crawford, T M, Cukierman, A, Denison, E V, Dibert, K, Dobbs, M A, Dutcher, D, Feng, C, Ferguson, K R, Gallicchio, J, Gambrel, A E, Gardner, R W, Goeckner-Wald, N, Gualtieri, R, Guns, S, Gupta, N, Guyser, R, Harke-Hosemann, A H, Harrington, N L, Hilton, G C, Hivon, E, Holzapfel, W L, Hood, J C, Howe, D, Hrubes, J D, Huang, N, Irwin, K D, Jeong, O B, Jonas, M, Jones, A, Khaire, T S, Kofman, A M, Kubik, D L, Kuhlmann, S, C -L Kuo, Leitch, E M, Lowitz, A, Marrone, D P, McMahon, J J, Meyer, S S, Millea, M, Montgomery, J, C Corbett Moran, Nadolski, A, Natoli, T, Nguyen, H, Novosad, V, Omori, Y, Padin, S, Pan, Z, Pearson, J, Posada, C M, Prabhu, K, Pryke, C, Rahlin, A, Reichardt, C L, Riebel, D, Riedel, B, Rouble, M, Sayre, J T, Schaffer, K K, Schiappucci, E, Sievers, C, Smecher, G, Sobrin, J A, Springmann, A, Stephen, J, Story, K T, Suzuki, A, Tandoi, C, Thorne, B, Vale, L R, Veach, T, Vieira, J D, Whitehorn, N, Wu, W L K, Yefremenko, V
Format:	Artikel
Sprache:	eng
Schlagworte:	Asteroid detection Asteroids Brightness temperature Cameras Cosmic microwave background Datasets Flux density Light curve Physics - Earth and Planetary Astrophysics South Pole Surface properties
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Zusammenfassung:	We present the first measurements of asteroids in millimeter wavelength (mm) data from the South Pole Telescope (SPT), which is used primarily to study the cosmic microwave background (CMB). We analyze maps of two \(\sim270\) deg\(^2\) sky regions near the ecliptic plane, each observed with the SPTpol camera \(\sim100\) times over one month. We subtract the mean of all maps of a given field, removing static sky signal, and then average the mean-subtracted maps at known asteroid locations. We detect three asteroids\(\text{ -- }\)(324) Bamberga, (13) Egeria, and (22) Kalliope\(\text{ -- }\)with signal-to-noise ratios (S/N) of 11.2, 10.4, and 6.1, respectively, at 2.0 mm (150 GHz); we also detect (324) Bamberga with S/N of 4.1 at 3.2 mm (95 GHz). We place constraints on these asteroids' effective emissivities, brightness temperatures, and light curve modulation amplitude. Our flux density measurements of (324) Bamberga and (13) Egeria roughly agree with predictions, while our measurements of (22) Kalliope suggest lower flux, corresponding to effective emissivities of \(0.66 \pm 0.11\) at 2.0 mm and \(
ISSN:	2331-8422
DOI:	10.48550/arxiv.2202.01406