The photoelectric astrolabe type II

Details The photoelectric astrolabe type II The photoelectric astrolabe type II

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975acasn..16..115.&link_type=abstract

Acta Astronomica Sinica, vol. 16, Dec. 1975, p. 115-122. In Chinese, with abstract in English.

Astronomy and Astrophysics

Astronomy

1

Astrometry, Instrument Errors, Photomultiplier Tubes, Telescopes, Time Measurement, Astronomical Coordinates, Light Amplifiers, Quartz Crystals, Recording Instruments, Star Trackers, Transit Time

Scientific paper

Improved photoelectric astrolabes were built in the 1972-1974 period. The time of almucantar transit of a star can be determined free of personal error with this astrolabe system which incorporates: a fused quartz mirror system and mercury level, a vacuum Ritchey-Chretien telescope (aperture 20 cm, focal length 2.4 m) with fixed glass grid, a time recorder, and three photomultipliers each provided with an ac amplifier. The vacuum telescope tube with horizontal entrance window makes it possible to eliminate refraction, dependence of refraction on the spectral class of the star, and irregular refraction in the tube. The astrolabe is equipped with high and low speed motors, and an automatic tracking mechanism in azimuth.

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