ISPI Filters

ISPI is offered with the broad band Y, J, H, Ks filters, as well as a set of narrow band filters. Basic data are given in the tables below. Filter scans are available for some of the filters here.

ISPI Broad Band Filters
Filter Central wavelength
(micron)		 Wavelengths @80%
(micron)
J 1.25 1.176 1.322
H 1.635 1.5005 1.7705
Ks 2.150 1.9915 2.2955
Y 1.0381 BW 0.1457mu

Fluxes, isophotal wavelengths, and isophotal frequencies for Vega have been determined by Tokunaga and Vacca for J, H, and K' filters which comprise part of the MKO/Gemini filter set. Copies of these filters were used in ISPI up until 2004B.

ISPI Narrow Band Filters
Filter Central wavelength
(micron)		 Wavelengths @80%
(micron)
Cont-203 2.0336 2.0262 2.0400
He I 2.0618 2.0545 2.0674
C IV 2.0826 2.0753 2.0892
H2 2.1262 2.125 2.146
Continuum,
2.14 mu		 2.1462 2.1385 2.1532
Br gamma 2.1648 2.1592 2.1738
He II 2.1911 2.1845 2.1976
H2 & continuum 2.25 mu 2.2527 2.2428 2.2618

February 12, 2007