Daytime sky background

SpeX measurements 10/24/2013 at 1400 HST. Clear.

Sun angle                       DN/sec/pixel
                   J                  H               K
21               22000              21500           9000
26               17700              15000           5500
31               15000              13000           4500
41               10500               9200           3000
51                8600               7500           2000

Convert into mag/sq. arcsec.
Use previously measured QE:
   0.18 (J), 0.22 (H), 0.23 (K),
   gain 14e/DN, image scale 0.12"/pix.
MKO filters.

Sun angle          J                  H               K
21                6.1                6.4             6.2
26                6.3                6.7             6.8
31                6.6                7.0             7.0
41                6.9                7.3             7.4
51                7.1                7.5             7.9