DeVeny Gratings / Filters / Lamps

This page is for quick reference. Please consult the DeVeny Users Manual for more detailed information.

DeVeny Gratings:

ID	Ruling (g/mm)	Blaze (Å)	Dispersion (Å/pix)	Free Spectra Range (Å)	Comments
DV1	150	5000	4.3	8800	KPNO 201
DV2	300	4000	2.17	4440	KPNO 09
DV3	300	6750	2.17	4440	KPNO 32
DV4	400	8500	1.66	3400
DV5	500	5500	1.33	2720	KPNO 240
DV6	600	4900	1.14	2320	KPNO 26new
DV7	600	6750	1.14	2320	KPNO 35
DV8	831	8000	0.80	1630	KPNO 47
DV9	1200	5000	0.58	1180
DV10	2160	5000	0.33	670	4500Å red tilt limit

DeVeny Filters:

Wheel

Position C

Position 1

Position 2

Position 3

Position 4

"Front"

pre-slit

Clear

Neutral Density

2.5 mag

Neutral Density

5.0 mag

Neutral Density

7.5 mag

EMPTY

"Rear"

post-slit

Clear

Order Sorting

GG420

NOT INSTALLED*

GG495

Order Sorting

OG570

NOT INSTALLED

(e.g., WG360?)

*The GG495 filter has come out of the instrument; replacement plan TBD. (2021Apr29)

DeVeny Calibration Arc Lamps:

Ne - Neon (stabilizes within seconds) – Video illustrating stabilization

Ar - Argon (stabilizes within 1 minute) – Video illustrating stabilization

Hg - Mercury (stabilizes in 1-3 minutes) – Video illustrating stabilization

Cd - Cadmium (stabilizes in ~6 minutes) – Video illustrating stabilization

Example Grating Settings:

Grating	Tilt Angle	Central Wavelength	Range	Filter	Notes
DV1	21.00º	7200 Å	2600 Å − 11,600 Å	GG420	O(2) at λ > 8400 Å
DV2	22.54º	5200 Å	3000 Å − 7400 Å	GG420
DV3	24.05º	6750 Å	4500 Å − 9000 Å	GG420	O(2) at λ > 8400Å
DV3	25.28º	8000 Å	5800 Å − 10,200 Å	OG570
DV4	26.06º	6600 Å	4900 Å − 8300 Å	GG420
DV4	27.89º	8000 Å	5800 Å − 10,200 Å	OG570
DV5	24.62º	4400 Å	3000 Å − 5800 Å	Clear
DV5	27.24º	6000 Å	4600 Å − 7400 Å	GG420
DV5	29.04º	7100 Å	5700 Å − 8500 Å	GG495
DV6	27.04º	4900 Å	3750 Å − 6050 Å	Clear
DV7	31.19º	7000 Å	5850 Å − 8150 Å	GG495
DV8	39.51º	8000 Å	7200 Å − 8800 Å	OG570
DV9	33.20º	4000 Å	3400 Å − 4600 Å	Clear
DV9	37.27º	5000 Å	4400 Å − 5600 Å	Clear
DV9	42.30º	6200 Å	5600 Å − 6800 Å	GG495
DV9	46.65º	7200 Å	6600 Å − 7800 Å	OG570	Collimator rails at lower limit
DV10	44.28º	3700 Å	3370 Å − 4030 Å	Clear	Collimator rails at lower limit
DV10	48.0º	4170 Å	3840 − 4500	Clear	Red tilt limit

Space shortcuts