Back to Standards Table of Contents

Home

Bandpass	Wavelength (microns)	Frequency	flambda(W m-2 um-1)	fnu(W m-2 Hz-1)
V	0.5556	5.4 x 1014	3.44 x 10-8	3.54 x 10-23
J	1.25	2.4 x 1014	3.07 x 10-9	1.60 x 10-23
H	1.65	1.8 x 1014	1.12 x 10-9	1.02 x 10-23
K	2.20	1.4 x 1014	4.07 x 10-10	6.57 x 10-24
L	3.45	8.7 x 1013	7.30 x 10-11	2.90 x 10-24
L'	3.80	7.9 x 1013	5.24 x 10-11	2.52 x 10-24
M	4.80	6.3 x 1013	2.12 x 10-11	1.63 x 10-24
	7.8	3.8 x 1013	3.22 x 10-12	6.53 x 10-25
	8.7	3.5 x 1013	2.10 x 10-12	5.30 x 10-25
	9.8	3.1 x 1013	1.32 x 10-12	4.23 x 10-25
N	10.1	3.0 x 1013	1.17 x 10-12	3.98 x 10-25
	10.3	2.9 x 1013	1.09 x 10-12	3.85 x 10-25
	11.6	2.6 x 1013	6.81 x 10-13	3.05 x 10-25
	12.5	2.4 x 1013	5.07 x 10-13	2.64 x 10-25
Q	20.0	1.5 x 1013	7.80 x 10-14	1.04 x 10-25

Notes: (1) The estimated uncertainties are 3% at JHKLL', 6% at M, 3% at N, and 5% at Q. (2) The flux density for 0.5556 um is from Hayes (1985). (3) The "reference wavelengths" (i.e., monochromatic wavelengths) of the IRTF N and Q filters are 10.1 and 20.0 um for standard stars. (4) flambda is given in MKS units for consistency. This unit is widely used outside the US and it is a better unit for posterity.