NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
The Solar Disk Sextant - Monitoring the size and shape of the sunThe Solar Disk Sextant (SDS) is a space instrument whose objective is to measure the solar diameter, at different orientations, as a function of time. Results would 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. In order to test the SDS concept a balloonborne version of the instrument has been fabricated and flown on three occasions. Preliminary results of the May 1990 flight are presented.
Document ID
19910049466
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sofia, Sabatino
(Yale University New Haven, CT, United States)
Maier, Eugene
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Twigg, Laurence
(Applied Research Corp. Landover, MD, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1991
Publication Information
Publication: of the COSPAR 28th Plenary Meeting, The Hague, Netherlands, June 25-July 6, 1990. A91-34076 13-92) Advances in Space Research
ISSN: 0273-1177
Subject Category
Spacecraft Instrumentation
Accession Number
91A34089
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available