Preparing for the observations

Night Falls at Paranal — Preparing for the Observations

As the sky gets darker, KUEYEN is still seen in evening moonlight. (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

Riguardo l'immagine

Identificazione:eso0021h
Tipo:Fotografico
Data di rilascio:16 Giugno 2000
Notizie relative:eso0021
Grandezza:1982 x 3000 px

Riguardo all'oggetto

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

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