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Ambiguous Taxonomic Asteroid Research (ATAR)

Presentation #411.02 in the session Asteroids: Main Belt (Poster)

Published onOct 23, 2023
Ambiguous Taxonomic Asteroid Research (ATAR)

Utilizing the 4m Blanco telescope with DECam, a visible wavelength main-belt characterization survey of approximately 2,000 asteroids was conducted to investigate surface color rotational variations. The observing cadence of g,r,i,z,VR with exposure times of 30,30,30,60,20, respectively, was modeled after SDSS where a complete cycle of filters would be taken within five minutes. Six nearby fields were observed seven times resulting in a dataset where each asteroid was observed seven times with a spacing of thirty minutes for three and a half hours.

Each individual DECam image was photometrically solved to PanSTARRS DR1. The results from the photometric calibration provide a linear model of zero-point versus g-r. This allows an accurate G2V zero-point to be determined for each image. Asteroids with an uncertainty below one arc-second were located and instrumental magnitude calculated. This process allows calibrated photometry to PanSTARRS, where changes in airmass and sky conditions are accounted for in the zero-point calculations. The resulting photometry is converted into reflectance, and reflectance values are compared to identify variations.

The statistical analysis focuses not on a single asteroid but on the group because the three and half hours of data collection allow most asteroids to have significant rotations. The asteroid rotations are identifiable using the VR filter, which has the highest signal-to-noise.

The results from the statistical analysis of the data set will be presented at DPS.

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