[HTML][HTML] HST UV observations of asteroid (16) Psyche

TM Becker, N Cunningham, P Molyneux… - The Planetary …, 2020 - iopscience.iop.org
TM Becker, N Cunningham, P Molyneux, L Roth, LM Feaga, KD Retherford, ZA Landsman
The Planetary Science Journal, 2020iopscience.iop.org
Abstract The Main Belt Asteroid (16) Psyche is the target object of the NASA Discovery
Mission Psyche. We observed the asteroid at ultraviolet (UV) wavelengths (170–310 nm)
using the Space Telescope Imaging Spectrograph on the Hubble Space Telescope during
two separate observations. We report that the spectrum is very red in the UV, with a blue
upturn shortward of∼ 200 nm. We find an absorption feature at 250 nm and a weaker
absorption feature at 275 nm that may be attributed to a metal-oxide charge transfer band …
Abstract
The Main Belt Asteroid (16) Psyche is the target object of the NASA Discovery Mission Psyche. We observed the asteroid at ultraviolet (UV) wavelengths (170–310 nm) using the Space Telescope Imaging Spectrograph on the Hubble Space Telescope during two separate observations. We report that the spectrum is very red in the UV, with a blue upturn shortward of∼ 200 nm. We find an absorption feature at 250 nm and a weaker absorption feature at 275 nm that may be attributed to a metal-oxide charge transfer band. We find that the red-sloped, relatively featureless spectrum of (16) Psyche is best matched with the reflectance spectrum of pure iron; however, our intimate mixture models show that small grains of iron may dominate the reflectance spectrum even if iron only comprises up to 10% of the material on the surface. We also stress that there is a limited database of reflectances for planetary surface analogs at UV wavelengths for comparison with the spectrum of (16) Psyche. The mid-and far-UV spectra (< 240 nm) are markedly different for each of the four asteroids observed at these wavelengths so far, including ones in the same spectral class, indicating that UV observations of asteroids could be used to better understand differences in the composition and processing of the surfaces of these small bodies.
iopscience.iop.org
以上显示的是最相近的搜索结果。 查看全部搜索结果