Subaru Telescope Optics - Basic Parameters

(design and manufactured)

Summary by SSH, Jan. 07, 2001

Baseline configuration is Ritchey-Chretien for optical secondary mirror for Cassegrain focus.

	design	manufactured
r1 (mm)	-30000.0	-30004.56 +/- 1.18
b1	-1.0083505	-1.00934 +/- 0.00059
r2 (mm)	-5524.297	-5524.19 +/- 0.30
b2	-1.9173222	-1.91608 +/- 0.0002

(Based on Dr. Wataru Tanaka's Reports, 03-01-99 NAO-97-0414F, 12-11-99)

Parameters for Optical Observations | Infrared Observations

(NB. difference between IRM2 and NsM2 for Ns-IR observations)

Outer diameter: primary mirror = 8.3 m, IRM2 = 1265 mm, Cs/Opt M2 = 1330 mm, Cs/Ns M2 = 1400 mm

Back focus: Cs = 3000 mm, Ns (default with Im. Rot.) = 4992.6 mm, Ns (w. o. Im. Rot.) = 4600 mm

ADC not included.

label	opt/Cs	opt/Cs	opt/Ns	opt/Ns	opt/Ns
	design	manu.	design	manu.	manu.
active corr.?		yes		yes	yes
M2	opt-Cs	opt-Cs	opt-Ns	opt-Ns	opt-Ns
mode (-> pupil)	optical	optical	optical	optical	optical
BF	3000	3000	4992.6	4992.6	4600
F1	1.829268293	1.829546341	1.829268293	1.829546341	1.829546341
Eff. Foc. Len. In air (mm)	-100000	-100029	-104207	-104228	-102265
Image Sp. F/#	12.1951	12.1987	12.7082	12.7108	12.4713
r1 (mm)	30000	30004.56	30000	30004.56	30004.56
r2 (mm)	5524.297	5524.19	5877.42	5877.81	5877.81
av. Curv. Rad. ( 2(C+D) inversed-> mm)	2409.26	2409.83	2623.29	2623.21	2621.76
b(1)	-1.008350515	-1.008245576	-1.008350515	-1.008394541	-1.006181444
b(2)	-1.917322232	-1.91608	-1.865055215	-1.86543	-1.86543
M1-M2 distance [mm]	12652.174	12654.44	12484.3	12486.39	12494.51
plate scale [arcsec/mm]	0.484813681	0.484954277	0.505209792	0.505311603	0.49579471
plate scale [mm/arcsec]	2.062648065	2.06204682	1.979375717	1.978984351	2.016965025
Spherical(")	-4.28975E-14	0	-2.67169E-14	-9.78364E-15	3.10442E-14
Coma@1'	-7.17627E-16	-0.000916239	0	0.000380084	-0.020575724
2C+D @ 1'	0.033983993	0.033972942	0.031127336	0.0311291	0.03115161
D @ 1'	0.025418838	0.025415971	0.023428941	0.023428935	0.023436438
Distortion @ 1'	-3.96575E-05	-3.96805E-05	-3.61235E-05	-3.61256E-05	-3.6152E-05

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Infrared Observations

label	IR/Cs	IR/Cs	IR/Ns	IR/Ns	IR/Ns	IR/Cs	IR/Ns	IR/Ns
	design	manu.	design	manu.	manu.	manu.	manu.	manu.
active corr.?		yes	yes	yes	yes	yes	yes	yes
M2	IRM2	IRM2	IRM2	IRM2	IRM2	opt-Cs	opt-Ns	opt-Ns
mode (-> pupil)	IR	IR	IR	IR	IR	optical-> IR mode	IR (optM2)	IR (optM2)
BF	3000	3000	4992.6	4992.6	4600	3000	4992.6	4600
F1	1.829268293	1.829546341	1.829268293	1.829546341	1.829546341	1.829546341	1.829546341	1.829546341
Eff. Foc. Len. In air (mm)	-100000	-100023	-110605	-110629	-108536	-100029	-104228	-102265
Image Sp. F/#	12.4119	12.4163	13.9477	13.9507	13.6868	12.4171	13.1435	12.896
r1 (mm)	30000	30004.56	30000	30004.56	30004.56	30004.56	30004.56	30004.56
r2 (mm)	5524.3	5524.56	5524.3	5524.56	5524.56	5524.19	5877.81	5877.81
av. Curv. Rad. ( 2(C+D) inversed-> mm)	2409.26	2409.04	2413.65	2413.42	2412.61	2409.83	2623.21	2621.76
b(1)	-1.008350515	-1.008410895	-1.019662637	-1.019723952	-1.017607852	-1.008245576	-1.008394541	-1.006181444
b(2)	-1.917322232	-1.91787	-1.917322232	-1.91787	-1.91787	-1.91608	-1.86543	-1.86543
M1-M2 distance [mm]	12652.17	12654.31	12612.45	12614.59	12621.81	12654.44	12486.39	12494.51
plate scale [arcsec/mm]	0.484813681	0.484925188	0.536228171	0.536344527	0.526197376	0.484954277	0.505311603	0.49579471
plate scale [mm/arcsec]	2.062648065	2.062178855	1.864874613	1.864471915	1.900426681	2.06204682	1.978984351	2.016965025
Spherical(")	-4.28975E-14	2.48354E-14	1.12888E-14	-3.38664E-14	1.42992E-14	0	-9.78364E-15	-2.74694E-14
Coma@1'	-7.17627E-16	0.000566436	0.112770408	0.113307995	0.09267796	-0.000916239	0.000380084	-0.020575724
2C+D @ 1'	0.033983993	0.033988279	0.033902946	0.033907451	0.033922352	0.033972942	0.0311291	0.03115161
D @ 1'	0.025418838	0.025419927	0.025391822	0.025392984	0.025397951	0.025415971	0.023428935	0.023436438
Distortion @ 1'	-3.96575E-05	-3.9659E-05	-3.95023E-05	-3.95039E-05	-3.9532E-05	-3.96805E-05	-3.61256E-05	-3.6152E-05

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