<=== observer ===>
"ASALAMA",\
"Salama, A.",\
"SAI",\
"ESTEC",\
"Keplerlaan 1",\
"",\
"2200 AG",\
"Noordwijk",\
"The Netherlands",\
"31 1719 84871",\
"31 1719 85434",\
"asalama@isosa6.estec.esa.nl"

<=== proposal ===>
"SS433",1,3,\
{"accretion discs","bipolar outflows","jets"},\
{"P.Barr","J. Clavel"}

<=== title ===>
ISO Observations of SS433

<=== abstract ===>

SCIENTIFIC ABSTRACT
We propose to study the infrared spectral variability of the
peculiar object SS433, a binary system and black hole candidate
from which plasma is ejected at 0.26c in two oppositly directed,
precessing jets.
Despite copious observations performed since its discovery in
1978 at many wavelengths, the physical nature of the black-hole
candidate SS433 is still uncertain. The IRAS (12, 25 micron) and
ground-based NIR observations indicate that a turnover in the
energy distribution will be found in the ISO wavelength range.
Proposed explanationss could be either free-free emission from
an ionized plasma or thermal emission from an accretion disk.
With our PHT observations (using PHT-S, -P and -C), some of which
will be repeated within the binary and precessional cycles, we aim
to derive observational constraints to the theories that model the
shape and physical properties of the emitting region.

OBSERVATION SUMMARY
The IR emission of SS433 will be measured with PHT-S (both ranges), PHT-P
(in the 11.5, 25 and 60 micron filters) and PHT-C (in the C_100 filter),
as CONCATENATED OBSERVATIONS.
Half-way through the precessional cycle of 163 days, the PHT-S observation
will be repeated 3 times, equally spaced within the binary cycle of 13 days.
The requested S/N is at least 10 for all observations, which are chopped,
in Triangular mode, with a throw of 90 arcsec with PHT-S, 120 arcsec with PHT-P
and 150 arcs with PHT-C. Diffraction limited apertures of 18, 52 and 99 arcsec
will be used with the 11.5, 25 and 60 microns filters, respectively.

<=== scientific_justification ===>
Time distribution for autumn launch targets:
        Team    top 40%    second 30%    third 30%
        SOT :    9276       2564         2214
      total :    9276       2564         2214

Time distribution for spring launch targets:
        Team    top 40%    second 30%    third 30%
        SOT :    9276       2564         2214
      total :    9276       2564         2214


<=== autumn_launch_targets ===>
1, "PHT40", 1.0, "N", "SS433                         ", 19.15591,    4.89833, 1950,     0.000,     0.000,  2334,   2
2, "PHT03", 1.0, "N", "SS433                         ", 19.15591,    4.89833, 1950,     0.000,     0.000,  2564,   3
3, "PHT22", 2.0, "N", "SS433                         ", 19.15591,    4.89833, 1950,     0.000,     0.000,  2214,   0
<=== spring_launch_targets ===>
1, "PHT40", 1.0, "N", "SS433                         ", 19.15591,    4.89833, 1950,     0.000,     0.000,  2334,   2
2, "PHT03", 1.0, "N", "SS433                         ", 19.15591,    4.89833, 1950,     0.000,     0.000,  2564,   3
3, "PHT22", 2.0, "N", "SS433                         ", 19.15591,    4.89833, 1950,     0.000,     0.000,  2214,   0