Characteristics of the ADONIS infrared cameras

SHARP camera

Model	NICMOS 3 Rockwell
Material	HgCdTe
Sensitivity domain	1-2.5 µm
Number of pixels	256 x 256
Pixel pitch	40 µm
Pixel scale	35 or 50 or 100 marsec
Field size	8.96 x 8.96 or 12.8 x 12.8 or 25.6 x 25.6 arcsec
Readout time	900 ms
Quantum efficiency	60 % (max)
Conversion factor	9.36 e^-/ADU
Dark current	5.8 exp-(t/27) e^-/s/pixel ! non linear !
Readout noise	39 ± 1 e^-rms
Linearity range (deviation less than 1%)	between -30700 and -9000 ADU
Full detector capacity	283000 e^-
Last update of this table	1999, September 1st

Note 1: Flat-Fields taken during several setup nights (dates are indicated) are available here

Note 2: Some photometric standards have been observed during several setup nights (dates are indicated). In particular, Zero Points & Sky Brightness are given. Please check the results here: http://www.ls.eso.org/lasilla/Telescopes/360cat/adonis/html/Table_Photometry_SHARP.html

COMIC camera

Model	LIR
Material	HgCdTe
Sensitivity domain	1-5 µm
Number of pixels	128 x 128
Pixel pitch	50 µm
Pixel scale	35 or 100 marsec
Field size	4.5 x 4.5 or 12.8 x 12.8 arcsec
Readout time	40 ms
Quantum efficiency	60 % (max)
Conversion factor	92 e^-/ADU
Dark current	2000 e^-/s/pixel
Readout noise	1300 ± 100 e^-rms
Linearity	between -32768 and 25655 ADU
Full detector capacity	5900000 e^-
Last update of this table	1999, September 1st

Note 1: Flat-Fields taken during several setup nights (dates are indicated) are available in the following ftp site: ftp://kila.ls.eso.org/pub/360cat/documentation/adonis/comic/FLAT/

Note 2: Some photometric standards have been observed during several setup nights (dates are indicated). In particular, Zero Points & Sky Brightness are given. Please check the results here: http://www.ls.eso.org/lasilla/Telescopes/360cat/adonis/html/Table_Photometry_COMIC.html

Some useful information about La Silla

Sky characteristics

Band	J	H	Ks	K	L	M
Absorption [mag/airmass]	0.09	0.06	0.10	0.11	0.13	0.27
Sky brightness [mag/arcsec²]	15.5	14	12	11.2	2	-0.9

Note: These values are typical (source: ESO measurements with IRAC), they need to be checked carefully for a high accuracy photometry. We have a catalog of infrared standards available at the telescope. You will find a catalog of infrared standards here.

La Silla Observatory location

Latitude	Longitude	Altitude
29º15' South	70º44' West	2400 m