  Enceladus is the Saturnian satellite known to have water vapor erupting from
its south pole region called Tiger Stripes. Data collected by Cassini
Ultraviolet Imaging Spectrograph during Enceladus transiting Saturn allow us to
estimate water plume absorption from 1115.35 - 1912.50 Angstrom and compare it
to the Mie solutions of Maxwell equations for particles with a diameter in the
range from 10 nm up to 2 um. The best fit performed using Gradient Descent
method indicates a presence of submicrometer particles of diameters: 120-180 nm
and 240-320 nm consistent with Thermofilum sp., Thermoproteus sp., and
Pyrobaculum sp. cell sizes present in hydrothermal vents on Earth.
