conversions

Conversion of Magnitudes to Janskys and F-Lambda

Check Isophotal wavelengths and absolute calibration of the MKO NIR filters. NEW!

One Jansky represents an incident energy flux density of 10**-26 Watt per sq. metre per Hz. The table below gives Jansky equivalents S(nu,0) for a source with magnitude 0.00 in the standard photometric bands.

Conversion Table

Band S F-lambda
Microns(Jy)W/m2/um
V (0.5556) 3540 3.44e-08
J (1.25) 1600 3.07e-09
H (1.65) 1020 1.12e-09
K (2.20) 657 4.07e-10
L (3.45) 290 7.30e-11
L'(3.80) 252 5.24e-11
M (4.80) 163 2.12e-11
(7.8) 65.3 3.22e-12
(8.7) 53.0 2.10e-12
(9.8) 42.3 1.32e-12
N (10.1) 39.8 1.17e-12
(10.3) 38.5 1.09e-12
(11.6) 30.5 6.81e-13
(12.5) 26.4 5.07e-13
Q (20.0) 10.4 7.80e-14

NB: These calibrations are derived from those given by Beckwith et al. (1976), except for slight modifications at 10 and 20 microns to be consistent with Tokunaga (1984).