Below we list the empirical throughput measurements (zeropoints) for all CAHA instruments on which the CAHA Exposure Time Simulator bases its predicted count rates and signal-to-noise.
Optical Imaging (Johnson Filters):
Instrument U B V R I Date CCD Source ---------- ----- ----- ----- ----- ----- ------ ------- ----------- MOSCA 3.5m 23.13 26.27 25.95 26.20(R2) 25.14 990819 SITE#16d Aguirre CAFOS 2.2m 21.41 23.43 23.46 23.80 23.09 000708 SITE#1d Alises CCD 1.23m - 22.25 22.59 22.64 22.06 010307 SITE#2b Riffeser/Hoyo
Optical Spectroscopy:
Instrument ZEROPOINT Date CCD Source ---------- ---------------- ----------- -------- -------- FOCES 2.2m 22.2 (V-band) 010201 LORAL#11i Pedraz TWIN 3.5m (blue) 25.3 (B-band/T08) 010515 Standard Pedraz TWIN 3.5m (red) 25.8 (R-band/T11) 010515 Standard Pedraz
NIR Imaging (Johnson Filters):
Instrument optics J H K K' Ks Date Source ---------------- ------ ----- ----- ----- ----- ----- ------ ---------------------- OMEGA-PRIME 3.5m wf 23.73 23.30 - 23.00 22.82 010211 Guijarro/Sanchez(H,ks) OMEGA-CASS 3.5m hr 23.25 23.17 22.89 - - 990209 Aceituno ALFA+O-CASS 3.5m hr 22.46 22.45 22.26 - - 010701 Aceituno
B=22.6, V=21.5, R=20.6, I=18.7 in mag/arcsec2
For the near-IR domain, the sky brightness have been measured using O-prime in February 2001 by Ana Guijarro in J and K'.J=15.57, K'=12.17 in mag/arcsec2
H=13.6 mag/arcsec2 from MAGIC manual.
NOTE: No empirical zeropoints are available for TWIN, MOSCA spectroscopy, CAFOS spectroscopy, MAGIC, OMEGA-CASS in spectroscopy mode.