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
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Last modified November 12, 2013