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Zero Points
A zero point is defined as the magnitude of an object that would yield 1 ADU/sec at an airmass of 1. They depend on instrument and telescope transmittances as well as detector electronics.
| Filter | Center wavelength (µm) |
Zero point magnitude (Holmes, red) |
Zero point magnitude (Watson, blue) |
Sky background (mag/arcsec) |
| CH4 H 4% S |
1.578 |
20.8 |
||
| CH4 H 4% L |
1.652 |
21.0 |
||
| H |
1.65 |
20.5 |
20.7 |
|
| Br-gamma |
2.1686 | 20.1 |
Last update 2008 Sep 02; Markus Hartung