Palomar 60-inch Telescope:

Spectrograph

Status: Observatory Instrument (McCarthy)

Scale at the aperture:

15.5 arcsec/mm

Collimator:

457 mm focal length
Off-axis paraboloid

Camera:

144 mm focal length
Transmission optics, AR coated

Detector:

CCD 9; TI 800 × 800; 15µ pixels

Modes:

	Echelle Mode	Standard Mode
Wavelength range Resolution	3600Å - 9000Å 19,000 (2 pixels)	3200Å - 9000Å 500 to 5,000 (2 pixels)

Filters:

Position	Filter	Thickness	Transmits
1 2 3 4	None GG-385 GG-455 OC-570	2 mm 3 mm 5 mm	< 6000Å > 4000Å > 4600Å > 6000Å

User filters: 2-inch square; 8 mm maximum thickness

Gratings:

Designation	lines/mm	Blaze	Tilt Offset	Mode
ECHELLE 150R 300G2 300G 500G2 600R 600R2 600G 830IR 1200G2 1200G 1800G2 1800G	52.65 150 300 300 500 600 600 600 830 1200 1200 1800 1800	63° 26' 8,000Å -5,000Å 5,000Å -5,000Å 7,500Å -7,500Å 5,000Å 10,000Å -5,000Å 5,000Å -5,000Å 5,000Å	8.2 9.8 58.0 9.0 18.2 5.9 5.7 2.1 5.4 37.6 7.3 4.8	Echelle Standard Standard Standard Standard Standard Standard Standard Standard Standard Standard Standard Standard

Negative blaze indicates grating mounted for old spectrograph (blaze angle in opposite direction).

Apertures:

Installed:

Designation

Label
Length
(arcsec)
Width
(arcsec)

FHOLE0
ESLIT1
DSLIT2
CSLIT3
BLONG4
ALONG5
S-7
S-1
S-2
S-3
L-3
L-10

7.28
7.36
7.90
360
360
0.77 dia
0.81
1.43
2.13
1.32
4.65

Slit dimensions given to two decimal places are ±0.03 arcsec.

Designation	Label	Length (arcsec)	Width (arcsec)
FHOLE0 ESLIT1 DSLIT2 CSLIT3 BLONG4 ALONG5	S-7 S-1 S-2 S-3 L-3 L-10	7.28 7.36 7.90 360 360	0.77 dia 0.81 1.43 2.13 1.32 4.65

Additional (Echelle):

Label	Length (arcsec)	Width (arcsec)
S-8 S-6 S-4 S-5	7.24 7.86 7.44 7.86	0.74 2.48 2.94 3.76

Slit dimensions given to two decimal places are ±0.03 arcsec.

Additional (Standard):

Label	Length (arcsec)	Width (arcsec)
L-1 L-2 L-4 L-5 L-6 L-7 L-8 L-9	360 360 360 360 360 360 360 360	9.22 0.74 2.05 3.33 9.22 2.0 3.99 3.33

Slit dimensions given to two decimal places are ±0.03 arcsec.

Cross Dispersers (Echelle):

UV/Visible

2 fused quartz prisms; 60° apex angle
e.g.,
- Orders 98 >= m >= 34 (3400Å 9900Å)
- Order-to-order spacing 18 9 pixels
-or-
- Orders 104 >= m >= 48 (3200Å 7000Å)
- Order-to-order spacing 20 9 pixels

Visible/IR:

2 Schott SF3 prisms; 42° apex angle
e.g.,
- Orders 78 >= m >= 50 (4300Å 6700Å)
- Order-to-order spacing 38 20 pixels
-or-
- Orders 70 >= m >= 34 (4800Å 9900Å)
- Order-to-order spacing 32 14 pixels

Extreme orders can be varied continuously. Listed above are representative settings.

Contact: Rick Burruss & Jeff Hickey Last modified: Jan 26, 2003
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