Rocket instrument for far-UV spectrophotometry of faint astronomical objects

G. F. Hartig; W. G. Fastie; A. F. Davidsen

doi:10.1364/AO.19.000729

Applied Optics
Vol. 19,
Issue 5,
pp. 729-740
(1980)
•https://doi.org/10.1364/AO.19.000729

Rocket instrument for far-UV spectrophotometry of faint astronomical objects

G. F. Hartig, W. G. Fastie, and A. F. Davidsen

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G. F. Hartig, W. G. Fastie, and A. F. Davidsen, "Rocket instrument for far-UV spectrophotometry of faint astronomical objects," Appl. Opt. 19, 729-740 (1980)

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Abstract

A sensitive sounding rocket instrument for moderate (~10-Å) resolution far-UV (λ1160–λ1750-Å) spectrophotometry of faint astronomical objects has been developed. The instrument employs a photon-counting microchannel plate imaging detector and a concave grating spectrograph behind a 40-cm Dall-Kirkham telescope. A unique remote-control pointing system, incorporating an SIT vidicon aspect camera, two star trackers, and a tone-encoded command telemetry link, permits the telescope to be oriented to within 5 arc sec of any target for which suitable guide stars can be found. The design, construction, calibration, and flight performance of the instrument are discussed.

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Primary mirror
Shape	ellipsoidal, ∊ = 0.90675, lightweighted
Diameter	40.64 cm o.d., 12.86 cm i.d.
Focal length	90.0 cm
Focal ratio	f/2.2
Coating	MgF₂ over Al, peak reflectance at 1216 Å
Secondary mirror
Shape	spherical, R = 33.611 cm, lightweighted
Diameter	7.00 cm
Focal length	−16.81 cm
Coating	MgF₂ over Al, peak reflectance at 1216 Å
Primary/secondary separation	75.6 cm
System effective focal length	629 cm
System effective focal ratio	f/15.5
Plate scale	32.7 arc sec/nm
Field of view	±12 arc min
Net unobstructed collecting area	~1100 cm²

	FOT 1	FOT 2, FOT 3
Grating manufacturer/serial no.	Hyperfine/251-1-1-1	Hyperfine/348-1-1-1
Radius of curvature	400.7 mm	400.7 mm
Dimensions	7 × 34 × 34 mm	7 × 36 × 36 mm
Frequency	1200 lines/mm	1028 lines/mm
Coating	Al + MgF₂(1216 Å)	Al + MgF₂ (1216 Å)
Blaze	1415 Å, 5° bipartite	1357 Å, 4° bipartite
Entrance aperture diameters	4.0 mm (2.2 arc min)	1.1 mm (36 arc sec)
Spacing	8.0 mm	5.0 mm
Spectral range	1260–1700 Å	1160–1760 Å
Dispersion	20 Å/mm	25 Å/mm
Central ray incidence angle	10°.0	9°.3
Focal ratio	f/15.5	f/15.5

Primary mirror
Shape	ellipsoidal, ∊ = 0.90675, lightweighted
Diameter	40.64 cm o.d., 12.86 cm i.d.
Focal length	90.0 cm
Focal ratio	f/2.2
Coating	MgF₂ over Al, peak reflectance at 1216 Å
Secondary mirror
Shape	spherical, R = 33.611 cm, lightweighted
Diameter	7.00 cm
Focal length	−16.81 cm
Coating	MgF₂ over Al, peak reflectance at 1216 Å
Primary/secondary separation	75.6 cm
System effective focal length	629 cm
System effective focal ratio	f/15.5
Plate scale	32.7 arc sec/nm
Field of view	±12 arc min
Net unobstructed collecting area	~1100 cm²

	FOT 1	FOT 2, FOT 3
Grating manufacturer/serial no.	Hyperfine/251-1-1-1	Hyperfine/348-1-1-1
Radius of curvature	400.7 mm	400.7 mm
Dimensions	7 × 34 × 34 mm	7 × 36 × 36 mm
Frequency	1200 lines/mm	1028 lines/mm
Coating	Al + MgF₂(1216 Å)	Al + MgF₂ (1216 Å)
Blaze	1415 Å, 5° bipartite	1357 Å, 4° bipartite
Entrance aperture diameters	4.0 mm (2.2 arc min)	1.1 mm (36 arc sec)
Spacing	8.0 mm	5.0 mm
Spectral range	1260–1700 Å	1160–1760 Å
Dispersion	20 Å/mm	25 Å/mm
Central ray incidence angle	10°.0	9°.3
Focal ratio	f/15.5	f/15.5

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Applied Optics