Calibration of quasi-static aberrations in exoplanet direct-imaging instruments with a Zernike phase-mask sensor - IV. Temporal stability of non-common path aberrations in VLT/SPHERE

Open Access

Table 1

Temporal sequences on the internal source

Date	DIT [s]	N_img	Duration [min]	Precomp.^(a)
2015-12-16	1.0	3500	116	No
2015-12-24	1.0	5000	166	Yes
2017-03-25a	1.0	6000	198	No
2017-03-25b	1.0	6000	198	No
2020-02-10	1.0	6000	198	Yes

Notes. ^(a)This column indicates whether the static NCPA have been pre-compensated using a ZELDA closed loop before the acquisition of the sequence (see Paper II and Paper III).

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