Combined approach to the Hubble Space Telescope wave-front distortion analysis

Claude Roddier; François Roddier

doi:10.1364/AO.32.002992

Applied Optics
Vol. 32,
Issue 16,
pp. 2992-3008
(1993)
•https://doi.org/10.1364/AO.32.002992

Combined approach to the Hubble Space Telescope wave-front distortion analysis

Claude Roddier and François Roddier

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Claude Roddier and François Roddier, "Combined approach to the Hubble Space Telescope wave-front distortion analysis," Appl. Opt. 32, 2992-3008 (1993)

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Abstract

Stellar images taken by the Hubble Space Telescope at various focus positions have been analyzed to estimate wave-front distortion. Rather than using a single algorithm, we found that better results were obtained by combining the advantages of various algorithms. For the planetary camera, the most accurate algorithms consistently gave a spherical aberration of −0.290-μm rms with a maximum deviation of 0.005 μm. Evidence was found that the spherical aberration is essentially produced by the primary mirror. The illumination in the telescope pupil plane was reconstructed and evidence was found for a slight camera misalignment.

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Date	JPL No.	Camera	Filter	Focus	Coordinates	Defocus (μm rms)	Spherical (μm rms)
First set of data
8/31	w24318	PC6	F487N	−5	448, 381	−0.7
9/4	w24706	PC6	F487N	+250	451, 382	+0.87
9/4	w24730	PC6	F487N	−90	450, 378	−1.18
9/5	w24818	PC6	F487N	−260	454, 378	−2.25	−0.294a
9/4	w24710	PC6	F889N	+250	450, 382	+0.89
9/4	w24734	PC6	F889N	−90	451, 379	−1.15	−0.288a
Second set of data
10/25	w29826	PC6	F889N	−267	532, 425	−2.32
10/25	w29830	PC6	F889N	−267	532, 425	−2.32
10/25	w29906	PC6	F889N	−260	530, 426	−2.27
10/25	w29910	PC6	F889N	−260	531, 425	−2.27
10/25	w29918	PC6	F889N	+ 170	537, 419	+0.2	−0.278
10/25	w29826	PC6	F889N	−267	532, 425	−2.32
10/25	w29830	PC6	F889N	−267	532, 425	−2.32
10/25	w29906	PC6	F889N	−260	530, 426	−2.27
10/25	w29910	PC6	F889N	−260	531, 425	−2.27
10/25	w29930	PC6	F889N	+210	538, 421	+0.42	−0.270
11/30	w33434	PC6	F631N	−90	713, 674	−1.12
12/3	w33714	PC6	F889N	+333	671, 677	+ 1.25	−0.298
Third set of data
12/3	w33702	PC6	F889N	+333	196, 228	+ 1.28	−0.305
12/3	w33706	PC6	F889N	+333	680, 158	+ 1.25	−0.294
12/3	w33710	PC6	F889N	+333	143, 674	+1.25	−0.300
12/3	w33726	PC6	F889N	+333	487, 495	+ 1.26	−0.302
10/26	w29938	PC6	F613N	+250	538, 422	+0.83	−0.292
11/30	w33402	PC6	F613N	−90	190, 221	−1.184	−0.292a
11/30	w33406	PC6	F613N	−90	453, 336	−1.216	−0.289a
11/30	w33410	PC6	F631N	−90	717, 337	−1.252	−0.295a
11/30	w33414	PC6	F631N	−90	184, 595	−1.205	−0.292a
11/30	w33422	PC6	F631N	−90	716, 412	−1.230	−0.288a
11/30	w33426	PC6	F631N	−90	183, 670	−1.200	−0.288a
11/30	w33430	PC6	F631N	−90	447, 672	−1.220	−0.286a
11/30	w33434	PC6	F631N	−90	713, 674	−1.253	−0.291a
Fourth set of data
		FOC	F486N	−90		−1.1	−0.245
		FOC	F486N	+250		0.8	−0.248

Image No.	x Coordinates	x Offset	y Coordinates	y Offset
w33042	190	−1.5	221	−2.5
w33406	453	7	336	0.5
w33410	717	17.5	337	0.5
w33414	184	−2.5	595	10.5
w33422	716	17.1	412	3
w33426	183	−2.2	670	12.8
w33430	447	7.5	672	12.8
w33434	713	17.1	674	12.6

Clamp	Coordinate	Measured	JPL Value	Δ	Δ (mm)
1	x	−0.767	−0.772	0.005	6
	y	0.471	0.440	0.031	37
2	x	0.009	0.009	0.000	0
	y	−0.889	−0.890	0.001	1
3	x	0.754	0.755	−0.001	1
	y	0.481	0.468	0.013	16

Image Pairs		Coordinate Difference

JPL No.		Δx	Δy
w33406	w33410	264	1
w33426	w33430	264	2
w33430	w33434	266	2
w33426	w33434	530	2

Image Pairs		Coordinate Difference

JPL No.		Δx	Δy
w33402	w33414	6	374
w33406	w33430	6	336
w33410	w33434	4	337

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