Instrument Throughput, Atmospheric Extinction, Filter Transformation
The instrument evolution is currently being monitored via the pipeline produced PAF files. The zero point trends in the J, H, and Ks filters since July 2006 can be found here.
For previous data about the zero point evolution please refer to this page.
|Date \ Filter||J||H||K||Ks|
|La Silla Folklore||0.08||0.06||0.11|
In the following, lower case refer to SOFI instrumental magnitudes' corrected for atmospheric extinction and upper case letters refer to tabulated magnitudes in the Persson et al. list of standards. Stars in the J-Ks colour range 0.24 to 1.28 were used to derive the following relationships.
- J-j=-0.007(J-K)+23.15, fit residual 0.013 magnitudes
- H-h=-0.022(J-K)+22.98, fit residual 0.009 magnitudes
- Ks-ks=0.023(J-K)+22.38, fit residual 0.013 magnitudes
- K-ks=-0.005(J-K)+22.39, fit residual 0.017 magnitudes
Counts are in electrons per second per Angstrom for a 15th magnitude A0 star at Zenith.
|Date \ Grism-Wavelength||Blue 10500||Blue 12000||Blue 13000||Blue 15000||Red 16000||Red 17000||Red 22000||Red 23000||Red 24000|
Last Modification: 2012-10-04, V.D. Ivanov