Spartan Dome flats Exposure Times

Updated 20 Jun 2022

Spartan IR Camera typical DOME FLAT lamp exposure times. It is a good idea to take a test exposure at H or K to confirm that the levels remain OK, before you start an extended calibration sequence. If that looks OK you should be able rely on the rest of the values. Don't forget to take images with the lamps turned off!

1) Broad-band filters:

Filter Wavelength (Å) Pupil Lamp (%) Texp (s) Average counts on
the 'd3' array (ADU)
Y 10189 LRLoose 10 15 11,800
J 12325 LRLoose 4 20 12,000
H 16253 LRLoose 2 30 9,400
K 21428 LRTight 2 15 9,800

2) Narrow-band filters:

Filter Wavelength (Å) Pupil Lamp (%) Texp (s) Average counts on
the 'd3' array (ADU)
HeI 10828 LRLoose 50 10 11,400
FeII 16404 LRLoose 10 18 10,200
Cont1 20407 LRTight 10 10 12,900
HeI/CIV 20653 LRTight 10 10 11,800
H2 21164 LRTight 10 10 11,500
Cont2 21400 LRTight 10 10 10,200
BrGamma 21621 LRTight 10 15 10,800
Cont3 22079 LRTight 10 10 10,900
CO 23309 LRTight 10 10 15,200