Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978icar...33..410c&link_type=abstract
Icarus, vol. 33, Feb. 1978, p. 410-413. In French.
Astronomy and Astrophysics
Astronomy
1
Astrometry, Jupiter (Planet), Longitude Measurement, Planetary Surfaces, Astronomical Photography, Error Analysis, Phase Shift, Planetary Rotation, Visual Observation, Jupiter, Spots, Rotation, Surface, Ephemeris, Surface Photography, Longitude, Telescopic Observations
Scientific paper
The phase exaggeration effect (Phillips effect) is determined quantitatively as a function of the planet's phase angle for the correction of the longitude of spots on Jupiter's disk. This was done on the basis of over 1000 visual observations of the longitude of permanent details of Jupiter's surface compared with photographic observations. The existence of a systematic error (plus 0.6 deg zenographic) in the visual observations is also proposed. As this error is probably caused by unidirectional motion of the detail over the planetary disk, it is referred to as the 'shift effect'.
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