Description of the Hendrix IUE asteroid reflectance spectra bundle V1.0
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Bundle Generation Date: 2020-09-21
Peer Review: 2019 Asteroid Review
Discipline node: Small Bodies Node


Content description for the Hendrix IUE asteroid reflectance spectra bundle
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Observations:
The raw IUE data used in this study were obtained from the INES (IUE Newly Extracted Spectra) Web site. Spectra were taken with the Long Wavelength Redundant (LWR) spectrograph, which covers the 185-335 nm wavelength range with a spectral spacing of 0.27 nm. The NEWSIPS versions of these spectra were published by Roettger & Buratti (1994). The INES files benefit from an improved geometric correction, a more accurate photometric correction, and an increased signal-to-noise ratio of the extracted IUE data through the use of new processing algorithms (Wamsteker & Gonzalez-Riestra 1998). 

Data Processing:
To determine the reflectance measured in the IUE observations, we used the equations outlined by Hendrix and Vilas (2006). We converted the spectra to photons cm-2 s-1 Angstrom-1 for division by the solar spectrum. For all observations we used a solar spectrum from UARS SOLSTICE (Rottman et al. 1993), corrected to an Earth-Sun distance of 1.0 AU. The observations were corrected for satellite-Sun and satellite-Earth distances at the time of each measurement. 

Files and Filenames:
The data directory includes individual reflectance spectra for each observation (where each file is named for the exposure number). For such targets where multiple observations at similar phase angles exist, the data directory includes average reflectance spectra and the document directory includes files (objectname_avg_list.pdf) documenting which 
spectra were averaged. The document directory also includes thumbnail plots (object name_thumbnail_plot.pdf) of reflectance spectra, and the original IUE header files (object name_exposure number_ines_fits_headers.pdf). 

References:
Hendrix, A. R. and F. Vilas 2006. The Effects of Space Weathering at UV Wavelengths: S-class Asteroids, Astron. J.: 132: 1396-1404.
Roettger, E. E., & Buratti, B. J. 1994, Icarus, 112, 496
Rottman G. J., Woods, T. N., & Sparn, T. P. 1993, J. Geophys. Res., 98, 10667 
Wamsteker & Gonzalez-Riestra 1998. in Ultraviolet Astrophysics beyond the IUE Final Archive, ed. W. Wamsteker & R. Gonzalez Riestra ( ESA SP-413; Noordwijk: ESA)


Caveats to the data user
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For all targets, these data appear to be quite noisy shortward of about 2400 Angstroms.