The Near-Earth Didymos-Dimorphos binary system after the NASA/DART impact: rotationally resolved spectral characterization.

In this data collection, we present new spectra of the binary asteroid Didymos obtained 25 days after DART's impact and two months later. These observations allowed us to investigate the spectroscopic rotation of Didymos, and geometric analyses were performed to identify the source regions corresponding to each spectrum. Although the spectra are consistent with the pre-impact behavior of the system and confirm its S-type taxonomic classification, the spectral slopes exhibit a slight increasing trend from October to December. Additionally, subtle variations were tentatively identified in correspondence with secondary eclipse/occultation events observed in both October and December.
The spectroscopic data were acquired using the Copernico Telescope (INAF-OAPD) in Asiago, Italy; the Large Binocular Telescope (INAF) on Mount Graham, Arizona; and the Gran Telescopio Canarias (GTC) in La Palma, Spain. Observations were conducted using the AFOSC instrument on the Copernico Telescope and the MODS instrument on the Large Binocular Telescope, covering the spectral range of 0.5–0.9 µm.
This dataset includes:
• Raw calibration files: Bias, flat-field, and lamp data.
• Spectra of the solar analog Landolt SA 98-978 and Didymos, obtained on different dates:
o Copernico Telescope: October 18, 2022; December 26, 2022; and December 27, 2022.
o Large Binocular Telescope: October 18, 2022.
• Reduced spectra of Didymos from October 19, 2022, acquired using the GTC. These are provided as three text files.
Additionally, a log file named Log.txt is included. This file summarizes key metadata for each dataset, such as file name, object, and observation date (FILENAME, OBJECT, DATE-OBS).