NASA Logo, National Aeronautics and Space Administration
NASA Space Science Data Coordinated Archive Header

Three-Channel Spectrometer (TKS)

NSSDCA ID: 1984-125A-02

Mission Name: Vega 1
Principal Investigators:Dr. Vladimir A. Krasnopolsky
Principal Investigators:Dr. Guy Moreels
Principal Investigators:Dr. Mitko Marinov Gogoshev


This experiment (TKS) was intended for (1) spectral and polarization studies of the dust, (2) spectral mapping of the coma, and (3) determination of the outflow rates of various gases from Comet Halley and their content. The instrument had a Cassegrain telescope with a focal length of 500 mm and an objective diameter of 140 mm. The light flux passed through three 1-deg slits located in the focal plane to three independent spectroscopic channels in the UV, visible, and infrared. The UV channel covered the range 120 to 350 nm, with spectral resolution of 0.5 nm, spatial resolution of 3 x 6 arc-min, and sensitivity of 3 rayleighs. The visible channel covered 350 to 900 nm, with spectral resolution of 1 nm, spatial resolution of 3 x 6 arc-min, and sensitivity of 10 rayleighs. The infrared channel covered 900 to 2000 nm, with spectral resolution of 10 to 12 nm, spatial resolution of 6 x 60 arc-min, and sensitivity of 3E4 rayleighs. The UV and visible channels used micro-channeltrons for detectors, while the infrared channel used a germanium photodiode.

Alternate Names

  • TKS
  • Vega1/TKS

Facts in Brief

Mass: 14 kg
Power (avg): 30 W
Bit rate (avg): 12.288 kbps


  • Planetary Science: Small Bodies

Additional Information

Questions and comments about this experiment can be directed to: Dr. David R. Williams



NameRoleOriginal AffiliationE-mail
Dr. Vladimir A. KrasnopolskyPrincipal InvestigatorInstitut Kosmicheskich Issledovaniya (IKI)
Dr. Guy MoreelsPrincipal InvestigatorCentre National d'Etudes
Dr. Mitko Marinov GogoshevPrincipal InvestigatorCentral Laboratory for Space Research, Astronomical Observatory
[] NASA Logo -