Palomar 200-inch Telescope:

WIRC - Wide field IR Camera

Orion Nebula Trapezium Cluster
Crab Nebula

Status: Observatory Instrument

Paper:

Please reference this SPIE paper:

Full SPIE paper

PDF file

Telescope:

200" prime focus, f/3.3
Field of view 8.7 arcminutes on a side

Detector:

2048 x 2048 Hawaii-II HgCdTe
gain 5.467 e^-/adu
Dark current ~0.048 adu/s = ~0.26 e^-/s
(due to slight filter leak, dome must be dark when taking dark frames)
read noise < 15 e^-
frame rate (shortest exposure time for full array) = 3.25 seconds

Scale:

0.2487 arcsec/pixel (residuals = rms 0.286" RA and 0.296" Dec)
The camera is rotated 1.39 degrees relative to N and E directly along rows and columns
This information is provided by Dave Thompsen, see his email

Filters: Standard Setup

Filter Wheel	Wheel Position	Filter	Wavelength Center	Manufacturer
Fore Wheel	F-1 F-2 F-3 F-4 F-5 F-6 F-7	Fe II H-cont Br gamma K-cont CH4-long CH4-short Open	1.644 1.570 2.166 2.270 1.690 1.570 -	NDC Infrared NDC Infrared NDC Infrared NDC Infrared Private Private -
Aft Wheel	A-1 A-2 A-3 A-4 A-5 A-6 A-7	PaBeta CO(0-2) H2 Open Ks H J	1.282 2.294 2.120 - 2.150 1.635 1.250	NDC Infrared NDC Infrared NDC Infrared - Barr Associates OCLI OCLI

Sensitivities:

For one hour total integration in 1" seeing for a point source (2" diameter aperture):

Filter S / N Magnitude Notes

J 5 sig 22.0 photometric, 21-22mar03 Â Â (provided by Dave Thompson)

Ksh 5 sig 20.6 photometric, 17sep02 Â Â (provided by Dave Thompson)

Filter	S / N	Magnitude	Notes
J	5 sig	22.0	photometric, 21-22mar03 Â Â (provided by Dave Thompson)
Ksh	5 sig	20.6	photometric, 17sep02 Â Â (provided by Dave Thompson)

Background:

This table will be updated periodically:

Filter Season DN / Sec / Pix DN / Sec / Arcsecond ² Magnitude

J September (clear) 65Â° 115 1840 14.6

J November (cirrus) 50Â° 70 1120 15.2

J March (clear) 32Â° 55 880 15.4

J April (clear) 40Â° 58 928 15.4

J May (clear) 68Â° 62 992 15.3

H September (clear) 65Â° 270 4320 13.9

H May (clear) 71Â° 320 5120 13.8

Ksh September (clear) 65Â° 515 8240 12.8

Ksh September (clear) 64Â° 680 10880 12.5

Ksh November (cirrus) 50Â° 500 8000 12.8

Ksh March (clear) 32Â° 390 6240 13.1

Ksh April (clear) 47Â° 355 5680 13.2

Ksh April (clear) 51Â° 422 6752 13.0

Ksh April (cirrus) 50Â° 435 6960 13.0

Ksh May (clear) 68Â° 750 12000 12.4

Br-Gamma May (clear) 68Â° 60 960 **

** Zero point not yet known

Filter	Season	DN / Sec / Pix	DN / Sec / Arcsecond ²	Magnitude
J	September (clear) 65Â°	115	1840	14.6
J	November (cirrus) 50Â°	70	1120	15.2
J	March (clear) 32Â°	55	880	15.4
J	April (clear) 40Â°	58	928	15.4
J	May (clear) 68Â°	62	992	15.3


H	September (clear) 65Â°	270	4320	13.9
H	May (clear) 71Â°	320	5120	13.8


Ksh	September (clear) 65Â°	515	8240	12.8
Ksh	September (clear) 64Â°	680	10880	12.5
Ksh	November (cirrus) 50Â°	500	8000	12.8
Ksh	March (clear) 32Â°	390	6240	13.1
Ksh	April (clear) 47Â°	355	5680	13.2
Ksh	April (clear) 51Â°	422	6752	13.0
Ksh	April (cirrus) 50Â°	435	6960	13.0
Ksh	May (clear) 68Â°	750	12000	12.4


Br-Gamma	May (clear) 68Â°	60	960	**

Number Of Unresponsive Pixels:

3 cooldown cycles between December 2002 and December 2003
1 cooldown cycle between December 2003 and January 2004

This table will be updated periodically:

Quadrant Sep 2002 Oct 2002 Nov 2002 Dec 2002 Dec 2003 Jan 2004

Lower Left (1) 124 116 127 152 114 148

Lower Right (2) 664 686 693 752 715 739

Upper Left (3) 1247 1011 1104 1142 670 948

Lower Right (4) 3142 3109 3232 3572 3204 3307

Quadrant	Sep 2002	Oct 2002	Nov 2002	Dec 2002	Dec 2003	Jan 2004
Lower Left (1)	124	116	127	152	114	148
Lower Right (2)	664	686	693	752	715	739
Upper Left (3)	1247	1011	1104	1142	670	948
Lower Right (4)	3142	3109	3232	3572	3204	3307

Optical Schematic:

Contact: Rick Burruss & Jeff Hickey Last modified: Dec 16, 2004

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