Stability of HARPS velocity measurements during an observing night

Powerful demonstration of the extraordinary stability of the HARPS spectrograph. It plots the instrumentally induced velocity change, as measured during one night (9 consecutive hours) in the commissioning period. The drift of the instrument is determined by computing the exact position of the Thorium emission lines. As can be seen, the drift is of the order of 1 m/s during 9 hours and is measured with an accuracy of only 20 cm/s.

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ESO

About the Image

Id:eso0308e
Típus:Chart
Közzététel napja:2003. március 27.
Related releases:eso0308
Size:1902 x 1369 px

About the Object

Név:Spectrograph
Típus:Unspecified : Technology : Observatory : Instrument
Category:Illustrations

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