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

Stellar UV Spectra Data on Microfiche


Availability: At NSSDC, Ready for Offline Distribution (or Staging if Digital)

Time span: 1971-11-14 to 1972-01-16


This data set consists of one published report, in hardcopy form, provided by the experimenter - "Mariner 9 Mars Orbiter Ultraviolet Spectrometer Experiment Data Report 6, January 19, 1972." The report covers the period November 14, 1971, to January 16, 1972. The data consist of stellar spectra observed by the UV spectrometer ranging in spectral type from O7 to A2. The data are presented in plots of instrumental response in data numbers vs wavelength in angstroms for both the 1400 to 3400 A and 1100 to 2000 A channels of the instrument. The sky background Lyman-alpha emission has not been removed from these plots. The data for each of the plots have been multiplied by an arbitrary constant to make the peak intensity fall between 200 and 250 data numbers. Noise pulses were suppressed by ignoring signals greater than a fixed level and the spectra have been smoothed with a running three-point average. Headings for the plots give the star name, orbit number, and scaling factor. The quality of the 1400 to 3400 A channel data is not as high as that of the 100 to 2000 A channel because of a higher noise level and a smaller field of view, which reduced the effective observing time for the star. Stellar measurements were by Mariner 9 when the planet could not be viewed, i.e., a 20-min period after earth occultation and a period of an hour or two at apoapsis between the end of tape recorder playback and the time Mars sets at Goldstone. The region of the sky that was observable with the instrument was limited by spacecraft design to the area north of the ecliptic between 96 deg and 165 deg from the sun. Each orbit generated about one million stellar data points. Good data were obtained for 29 stars. These stars are listed in a table presented in the report along with the spectral type, the visual magnitude, the blue to visual intensity magnitude ratio, the UV to blue intensity magnitude ratio, the number of scans summed, indications if any 1400 to 3400 A channel plots were obtained, and the pass number. Also included were (1) a table giving the strongest UV lines in the Mariner 9 stellar data, (2) a picture giving the sequence of spacecraft events for a typical zenith (Goldstone) pass, (3) a celestial map showing the area of the sky that could be observed with the instrument on November 15, 1971, and (4) a plot showing the average signal in the 100 to 1200 A channel during orbit 72.

Alternate Names

  • Stellar Data on Microfiche
  • Stellar Data


  • Planetary Science: Atmospheres
  • Planetary Science: Biology
  • Planetary Science: Geology and Geophysics


  • 71-051A-02D

Additional Information



Questions and comments about this data collection can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Dr. Charles A. BarthData ProviderUniversity of
Dr. Charles A. BarthGeneral ContactUniversity of
[] NASA Logo -