Purpose of the flight and payload description
The Solar Disk Sextant (SDS) is a balloon-borne instrument whose objective is to measure the solar diameter, at different orientations, as a function of time. Results include the solar oblateness, the oscillation spectrum for use in helioseismology, and the rate of the secular variation of the solar diameter. The required instrumentation precision (a few milliarcsec) is attained by means of an objective beam splitting wedge which produces multiples solar images through consecutive reflections.
Details of the balloon flight
Balloon launched on: 5/4/1990 at 14:27 utc
Launch site: Scientific Flight Balloon Facility, Fort Sumner, (NM), US
Balloon launched by: National Scientific Balloon Facility (NSBF)
Balloon manufacturer/size/composition: Zero Pressure Balloon N40I-8/8T-11.62
Balloon serial number: R11.62-1-110
Flight identification number: 286N
End of flight (L for landing time, W for last contact, otherwise termination time): 5/5/1990 at 0:15 utc
Landing site: 15 miles W of Sayre, Oklahoma, US
- NASA Balloon Flights (1989-1998) in NASA Historical Data Book, Vol. VII: NASA Launch Systems, Space Transportation, Human Spaceflight, and Space Science, 1989-1998
- The solar disk sextant: Monitoring the size and shape of the sun Advances in Space Research Volume 11, Issue 4, 1991, Pages 123-132
- Yale Astronomy Department, New Haven, Connecticut 06511. Report for the period 1 Jul 1989 - 30 Jun 1990 Bulletin of the Astronomical Society, Vol. 23, No. 1, p. 810 - 818
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