Pointing Calibration of GroundBIRD Telescope Using Moon Observation Data

Y. Sueno; J. J.A. Baselmans; A. H.M. Coppens; R. T. Génova-Santos; M. Hattori; S. Honda; K. Karatsu; H. Kutsuma; K. Lee; T. Nagasaki; S. Oguri; C. Otani; M. Peel; J. Suzuki; O. Tajima; T. Tanaka; M. Tsujii; D. J. Thoen; E. Won

doi:10.1093/ptep/ptae011

Pointing Calibration of GroundBIRD Telescope Using Moon Observation Data

Y. Sueno, J. J.A. Baselmans, A. H.M. Coppens, R. T. Génova-Santos, M. Hattori, S. Honda, K. Karatsu, H. Kutsuma, K. Lee, T. Nagasaki, S. Oguri, C. Otani, M. Peel, J. Suzuki, O. Tajima, T. Tanaka, M. Tsujii, D. J. Thoen, E. Won

Department of Physics

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1 Citation (Scopus)

Abstract

Understanding telescope pointing (i.e. line of sight) is important for observing the cosmic microwave background (CMB) and astronomical objects. The Moon is a candidate astronomical source for pointing calibration. Although the visible size of the Moon (30^`) is larger than that of the planets, we can frequently observe the Moon once a month with a high signal-to-noise ratio. We developed a method for performing pointing calibration using observational data from the Moon. We considered the tilts of the telescope axes as well as the encoder and collimation offsets for pointing calibration. In addition, we evaluated the effects of the nonuniformity of the brightness temperature of the Moon, which is a dominant systematic error. As a result, we successfully achieved a pointing accuracy of 3.3^`. This is one order of magnitude smaller than an angular resolution of 36^`. This level of accuracy competes with past achievements in other ground-based CMB experiments using observational data from the planets.

Original language	English
Journal	Progress of Theoretical and Experimental Physics
Volume	2024
Issue number	2
DOIs	https://doi.org/10.1093/ptep/ptae011
Publication status	Published - 2024 Feb 1

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Publisher Copyright:
© The Author(s) 2024.

ASJC Scopus subject areas

General Physics and Astronomy

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10.1093/ptep/ptae011

Cite this

Sueno, Y., Baselmans, J. J. A., Coppens, A. H. M., Génova-Santos, R. T., Hattori, M., Honda, S., Karatsu, K., Kutsuma, H., Lee, K., Nagasaki, T., Oguri, S., Otani, C., Peel, M., Suzuki, J., Tajima, O., Tanaka, T., Tsujii, M., Thoen, D. J., & Won, E. (2024). Pointing Calibration of GroundBIRD Telescope Using Moon Observation Data. Progress of Theoretical and Experimental Physics, 2024(2). https://doi.org/10.1093/ptep/ptae011

Sueno, Y, Baselmans, JJA, Coppens, AHM, Génova-Santos, RT, Hattori, M, Honda, S, Karatsu, K, Kutsuma, H, Lee, K, Nagasaki, T, Oguri, S, Otani, C, Peel, M, Suzuki, J, Tajima, O, Tanaka, T, Tsujii, M, Thoen, DJ & Won, E 2024, 'Pointing Calibration of GroundBIRD Telescope Using Moon Observation Data', Progress of Theoretical and Experimental Physics, vol. 2024, no. 2. https://doi.org/10.1093/ptep/ptae011

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title = "Pointing Calibration of GroundBIRD Telescope Using Moon Observation Data",

abstract = "Understanding telescope pointing (i.e. line of sight) is important for observing the cosmic microwave background (CMB) and astronomical objects. The Moon is a candidate astronomical source for pointing calibration. Although the visible size of the Moon (30`) is larger than that of the planets, we can frequently observe the Moon once a month with a high signal-to-noise ratio. We developed a method for performing pointing calibration using observational data from the Moon. We considered the tilts of the telescope axes as well as the encoder and collimation offsets for pointing calibration. In addition, we evaluated the effects of the nonuniformity of the brightness temperature of the Moon, which is a dominant systematic error. As a result, we successfully achieved a pointing accuracy of 3.3`. This is one order of magnitude smaller than an angular resolution of 36`. This level of accuracy competes with past achievements in other ground-based CMB experiments using observational data from the planets.",

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T1 - Pointing Calibration of GroundBIRD Telescope Using Moon Observation Data

AU - Sueno, Y.

AU - Baselmans, J. J.A.

AU - Coppens, A. H.M.

AU - Génova-Santos, R. T.

AU - Hattori, M.

AU - Honda, S.

AU - Karatsu, K.

AU - Kutsuma, H.

AU - Lee, K.

AU - Nagasaki, T.

AU - Oguri, S.

AU - Otani, C.

AU - Peel, M.

AU - Suzuki, J.

AU - Tajima, O.

AU - Tanaka, T.

AU - Tsujii, M.

AU - Thoen, D. J.

AU - Won, E.

PY - 2024/2/1

Y1 - 2024/2/1

N2 - Understanding telescope pointing (i.e. line of sight) is important for observing the cosmic microwave background (CMB) and astronomical objects. The Moon is a candidate astronomical source for pointing calibration. Although the visible size of the Moon (30`) is larger than that of the planets, we can frequently observe the Moon once a month with a high signal-to-noise ratio. We developed a method for performing pointing calibration using observational data from the Moon. We considered the tilts of the telescope axes as well as the encoder and collimation offsets for pointing calibration. In addition, we evaluated the effects of the nonuniformity of the brightness temperature of the Moon, which is a dominant systematic error. As a result, we successfully achieved a pointing accuracy of 3.3`. This is one order of magnitude smaller than an angular resolution of 36`. This level of accuracy competes with past achievements in other ground-based CMB experiments using observational data from the planets.

AB - Understanding telescope pointing (i.e. line of sight) is important for observing the cosmic microwave background (CMB) and astronomical objects. The Moon is a candidate astronomical source for pointing calibration. Although the visible size of the Moon (30`) is larger than that of the planets, we can frequently observe the Moon once a month with a high signal-to-noise ratio. We developed a method for performing pointing calibration using observational data from the Moon. We considered the tilts of the telescope axes as well as the encoder and collimation offsets for pointing calibration. In addition, we evaluated the effects of the nonuniformity of the brightness temperature of the Moon, which is a dominant systematic error. As a result, we successfully achieved a pointing accuracy of 3.3`. This is one order of magnitude smaller than an angular resolution of 36`. This level of accuracy competes with past achievements in other ground-based CMB experiments using observational data from the planets.

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JO - Progress of Theoretical and Experimental Physics

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Pointing Calibration of GroundBIRD Telescope Using Moon Observation Data

Abstract

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