CSHELL Throughput


All data values are in ADU.  Wavelengths were chosen to match 63.5° blaze angle near JHKLM band centers.  Continuum lamp counts are the mean of a 30 x 30 pixel box near spectrum center.  Stellar images were centered in the field and are the star - sky sum in a 30 x 30 pixel box.  Stellar spectra were centered midway along a 2" slit and are the star - sky sum in a 10 x 20 (x by y) pixel box.


MOST RECENT THROUGHPUT MEASUREMENTS

Taken by John Rayner on 15 March 1998 (1" seeing at 2.2 μm)

λ(μm) Standard Magnitude Cont. Spect Stellar Image Stellar Spect
1.2537 HD 77281 J = 7.11 260 / 5 sec 62,500 / 2 sec 3,200 / 60 sec
1.6593 HD 77281 H=7.05 710 / 5 sec 60,500 / 2 sec 3,800 / 60 sec
2.1698 HD 77281 K=7.03 1,300 / 5 sec 48,700 / 1 sec 4,500 / 60 sec
3.5260 HR 4828 L=4.68 650 / 5 sec 19,800 / 0.1 sec 26,000 / 60 sec
4.7010 HR 4828 M=4.69 5,350 / 5 sec 5,700 / 0.1 sec 2,200 / 10 sec



HISTORICAL THROUGHPUT MEASUREMENTS

Taken by John Rayner in 1997

λ(μm) Standard Magnitude Cont. Spect Stellar Image Stellar Spect
1.2537 HD 77281 J = 7.11 300 / 5 sec 59,921 / 2 sec 3,968 / 60 sec
1.6593 HD 77281 H=7.05 820 / 5 sec 51,110 / 2 sec 5,462 / 60 sec
2.1698 HD 77281 K=7.03 1,502 / 5 sec 46,029 / 1 sec 4,833 / 60 sec
3.5260 HR 4828 L=4.68 542 / 5 sec 19,174 / 0.1 sec 32,000 / 60 sec
4.7010 HR 4828 M=4.69 3,150 / 5 sec 8,432 / 0.1 sec 2,500 / 10 sec


LAST UPDATE: February 1, 2010 (format only)