TY - JOUR
T1 - Ground-Based Thermal-IR Spectroscopic Observations of Jupiter During the Galileo Encounter
AU - Sada, P. V.
AU - Jennings, D.
AU - McCabe, G.
AU - Deming, D.
AU - Bjoraker, G.
PY - 1995/12/1
Y1 - 1995/12/1
N2 - High resolution spectroscopic observations of Jupiter at selected
thermal-infrared wavelengths are scheduled to be performed using
CELESTE, a Goddard-developed cryogenic echelle spectrometer. These
observations will be carried out in conjunction with the McMath-Pierce
60-inch Solar Telescope (KPNO/NSO) during the inital encounter phase of
the Galileo spacecraft with the planet. This arrangement was
successfully used in 1994-95 to perform daytime observations of Jupiter
close to the Sun. The planet will be located 9(deg) away from the Sun in
the sky on 7 December 1995, the day Galileo's probe is scheduled to
enter the atmosphere of the planet. Galileo's entry probe is programmed
to shed its heat shield and start directly sampling the atmosphere of
Jupiter at a pressure level of about 100 mbar. We plan to carry out
observations of a complementary nature to those of the entry probe by
using molecular species which better sample the stratosphere of Jupiter.
These observations, in conjunction with those obtained by Galileo, will
help characterize the state of the atmosphere of Jupiter at the time of
the encounter. In particular we plan to observe the 587 cm(-1) S(1)
quadrupole line of H2, which yields abundance-independent
temperature information on the upper troposphere and lower stratosphere
of Jupiter. We also plan to measure strong stratospheric emission
features from molecules such as CH4,
C2H6, and C2H2. These
spectral observations will be used to retrieve temperature and species
abundance information with some degree of spatial discrimination.
Preliminary results from these observations will be presented. (1)
National Research Council Resident Research Associate. (2) Hughes/STX.
AB - High resolution spectroscopic observations of Jupiter at selected
thermal-infrared wavelengths are scheduled to be performed using
CELESTE, a Goddard-developed cryogenic echelle spectrometer. These
observations will be carried out in conjunction with the McMath-Pierce
60-inch Solar Telescope (KPNO/NSO) during the inital encounter phase of
the Galileo spacecraft with the planet. This arrangement was
successfully used in 1994-95 to perform daytime observations of Jupiter
close to the Sun. The planet will be located 9(deg) away from the Sun in
the sky on 7 December 1995, the day Galileo's probe is scheduled to
enter the atmosphere of the planet. Galileo's entry probe is programmed
to shed its heat shield and start directly sampling the atmosphere of
Jupiter at a pressure level of about 100 mbar. We plan to carry out
observations of a complementary nature to those of the entry probe by
using molecular species which better sample the stratosphere of Jupiter.
These observations, in conjunction with those obtained by Galileo, will
help characterize the state of the atmosphere of Jupiter at the time of
the encounter. In particular we plan to observe the 587 cm(-1) S(1)
quadrupole line of H2, which yields abundance-independent
temperature information on the upper troposphere and lower stratosphere
of Jupiter. We also plan to measure strong stratospheric emission
features from molecules such as CH4,
C2H6, and C2H2. These
spectral observations will be used to retrieve temperature and species
abundance information with some degree of spatial discrimination.
Preliminary results from these observations will be presented. (1)
National Research Council Resident Research Associate. (2) Hughes/STX.
M3 - Article
VL - 187
JO - American Astronomical Society, 187th AAS Meeting
JF - American Astronomical Society, 187th AAS Meeting
ER -