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Table 1

Details of two transit observations for HAT-P-12b.

Parameter OB12 OB13
Program ID GTC17-12A (a) GTC52-13A (a)
RA (J2000) 13h57m33.467s
Dec (J2000) + 43°29′36.602″
Observing date 21 Apr. 2012 17 Mar. 2013
Start time (UT) 00:13:13 22:50:34
End time (UT) 03:31:07 02:34:42
Exposure time (s) 45 40
Readout velocity (kHz) 500 200 (b)
Readout time (s) 7.8 21.0
Readout noise (e) ~8.0 ~4.5
Frame number 209 213
Airmass 1.03–1.17 1.05–1.79
FWHM (c) 0.64″–1.02″ 0.94″–1.70″
Resolving power (Å) 6.6–10.5 9.7–17.5

Notes. (a) PI: E. Pallé. (b) Readout speed of 200 kHz is currently the standard mode for OSIRIS. (c)Full width at half maximum (FWHM) of the point spread function (PSF) of stars in the spatial direction at the central wavelength of 7187 Å.

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