Preparing for observations at Paranal

Night Falls at Paranal — Preparing for the Observations

KUEYEN is tilted towards the horizontal position during a test exposure sequence. (Photo obtained on March 23, 2000).

Astronomical observations begin soon after sunset at Paranal.

Normally, they start with a series of test and calibration exposures that serve to determine the exact status of the various instruments, e.g., in terms of sensitivity at different wavelengths.

Some of these exposures are performed on a white target on the inside of the telescope enclosure, others are made on the sky, as it gets progressively darker.

If they are included in a programme, observations of comparatively bright objects may be carried out while the sky is still relatively bright. However, those of the faintest objects must wait until the period of "astronomical twilight" is over, i.e., when the Sun is at least 18° below the horizon.

Crediti:

ESO/H.H.Heyer

A proposito dell'immagine

Identificazione:eso0021f
Tipo:Fotografico
Data di pubblicazione:16 Giugno 2000
Notizie relative:eso0021
Dimensione:7370 x 8856 px

A proposito delll'oggetto

Nome:Very Large Telescope, VLT Unit Telescopes
Tipo:Unspecified : Technology : Observatory : Telescope
Categoria:Paranal

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