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Two-Color Earth's Limb Photos

NSSDCA ID: 1965-043A-05

Mission Name: Gemini 4
Principal Investigator:Dr. Max Petersen


The two-color earth limb photography experiment was designed to define the earth's limb by photographing the daylight horizon with a blue and red filter. Photos of the earth's limb were taken with a hand-held 70-mm hasselblad camera. The pictures were taken looking forward, in the direction of orbit as judged by the astronaut. A series of three photos each were taken at intervals of about 5 min during the sunlit part of one orbit during the June 3 - 6, flight. A two color (red in the center and blue on the sides) filter mosaic was mounted closely in front of the focal plane. Densitometric evaluations were done on the photos.

Alternate Names

  • Gemini4/Two-ColorEarth'sLimbPhotos

Funding Agency

  • Unknown (United States)


    Additional Information

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



    NameRoleOriginal AffiliationE-mail
    Dr. Max PetersenPrincipal InvestigatorMassachusetts Institute of Technology
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