Data for Spectral Characteristics of Interstellar Object 3I/ATLAS from SOAR Observations

3I/ATLAS SOAR Optical Spectroscopy Data ArchiveGenerated: 2025-08-08 19:12:25 OBSERVATION DETAILS:- Target: Comet 3I/ATLAS (3I/2025 A1)- Date: 2025-07-03- Telescope: SOAR 4.1m telescope- Instrument: Goodman Spectrograph - Author: Thomas H. Puzia, Rohan Rahatgaonkar, Juan Pablo Carvajal, Prasanta K. Nayak, Baltasar Luco- Wavelength range: 3700.1 - 7057.2 Å- Spectral resolution: ~5Å (after smoothing) APERTURE SIZES:- 1" FWHM: Point source extraction- 2" FWHM: Extended source extraction CALIBRATION METHODS:- Solar Analog: HIP 90136 (G2V star)- SOLSPEC: Meftah et al. 2018 solar reference- Standard Star: CD-32 9927 (Hamuy et al.) PROCESSING PIPELINE:1. Spectral extraction & wavelength calibration2. Sensitivity function creation from standard star3. Absolute flux calibration 4. Reflectance spectrum calculation5. Normalization to 1.0 at 6000Å6. Gaussian smoothing (5Å FWHM)7. Uncertainty propagation through all stages DATA COLUMNS (16 total):0-11: Spectral data (wavelength, fluxes, reflectances)12-15: Uncertainties (normalized and smoothed reflectances) UNCERTAINTY PROPAGATION:- Source: CCD readout noise and Poisson statistics- Propagated through: Flux calibration → reflectance → normalization → smoothing- Monte Carlo validation: 1000 realizations for key derived quantities- Statistical tests: Equivalent width, spectral slopes with proper uncertainties FILES:- 3I_SOAR_1fwhm_complete_pipeline.dat: 1" aperture data with uncertainties- 3I_SOAR_2fwhm_complete_pipeline.dat: 2" aperture data with uncertainties - 3I_SOAR_metadata.txt: This file CONTACT:- Observer: Rohan Rahatgaonkar- Institution: Institute of Astrophysics UC | Chile- Email: [e-mail]