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.

Credit:

ESO

About the Image

Id:eso0308e
Type:Chart
Release date:27 March 2003
Related releases:eso0308
Size:955 x 700 px

About the Object

Name:HARPS, Spectrograph
Type:• Unspecified : Technology : Observatory : Instrument
• X - Illustrations

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