On-orbit performance of the Hubble Space Telescope fine guidance sensors

David J. Eaton; Richard A. Whittlesey; Bruce W. Allen; Roy Stoll; Linda Abramowicz-Reed; Marcel Margulies

doi:10.1364/AO.32.001689

Applied Optics
Vol. 32,
Issue 10,
pp. 1689-1695
(1993)
•https://doi.org/10.1364/AO.32.001689

On-orbit performance of the Hubble Space Telescope fine guidance sensors

David J. Eaton, Richard A. Whittlesey, Bruce W. Allen, Roy Stoll, Linda Abramowicz-Reed, and Marcel Margulies

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David J. Eaton, Richard A. Whittlesey, Bruce W. Allen, Roy Stoll, Linda Abramowicz-Reed, and Marcel Margulies, "On-orbit performance of the Hubble Space Telescope fine guidance sensors," Appl. Opt. 32, 1689-1695 (1993)

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Abstract

The observed and measured on-orbit performance of various aspects of the fine guidance sensors is presented and discussed in the light of the original requirements and predictions. The fine guidance sensors are shown to meet or exceed the original requirements concerning dynamic pointing errors, photometric repeatability, and moving-target tracking capability. Calibration accuracy has been sufficient for observations to date, and fine-lock acquisitions are approaching a 100% success rate. Improvements to the fine-guidance-sensor tolerance of telescope spherical aberration, the South Atlantic anomaly, and solar-panel vibrations have been made, and further improvements are expected.

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Sensor Location	Temperature Change in 24 h After Slew (°C)

	Fine Guidance Sensor 1		Fine Guidance Sensor 2		Fine Guidance Sensor 3

	T/V Test^a	OV^b	T/V Test^c	OV^b	T/V Test^d	OV^b
HV/pad shelf	1.39	0.18	1.61	0.19	1.72	0.55
Interferometer	0.17	0.18	0.39	0.19	0.39	0.0
Pickoff arm	0.61	0.37	0.39	0.19	0.39	0.18
Bench below image dissector electronics	0.61	0.18	0.50	0.0	0.50	0.19
Bench near motor encoder A	0.39	0.0	0.39	0.0	0.39	0.37
Motor encoder housing	0.0	0.0	0.0	0.0	0.0	0.0
PMT	0.39	0.0	0.22	0.19	0.22	0.0
Keel near D Fitting	0.17	0.0	0.39	0.0	0.39	0.18
Graphite epoxy oven near the optical control system	0.39	0.0	0.22	0.18	0.22	0.0

Fine Guidance Sensor	Average PMT Counts	Visual Magnitude	Number of Observations^a	Standard Deviation (% of Average Counts)
1	322	12.7	5	0.46
1	1048	11.4	4	0.44
1	982	11.5	4	0.32
1	305	12.7	5	0.28
1	836	11.6	4	0.21
2	195	13.0	3	0.44
2	268	12.7	4	0.35
2	391	12.3	4	0.47
2	742	11.6	4	0.21
3	509	12.4	5	0.72
3	447	12.6	5	0.63
3	474	12.5	4	0.66
3	1246	11.5	4	0.39
3	603	12.2	4	0.45
3	4659	10.0	4	0.47

Fine Guidance Sensor	Filter	Ground Test	On-Orbit Days 180–185 1990	On-Orbit Days 264–265 1990	On-Orbit Day 315 1991	Percent Change from 1990.264–5 to 1991.315
1	Clear	511	508	493	490	−0.6
1	2/3^b	250	210	241	238	−1.2
2	Clear	457	418	409	407	−0.5
2	2/3^b	227	207	202	203	0.5
3	Clear	864	625	611	614	0.5
3	2/3^b	423	311	299	302	1.0

Sensor Location	Temperature Change in 24 h After Slew (°C)

	Fine Guidance Sensor 1		Fine Guidance Sensor 2		Fine Guidance Sensor 3

	T/V Test^a	OV^b	T/V Test^c	OV^b	T/V Test^d	OV^b
HV/pad shelf	1.39	0.18	1.61	0.19	1.72	0.55
Interferometer	0.17	0.18	0.39	0.19	0.39	0.0
Pickoff arm	0.61	0.37	0.39	0.19	0.39	0.18
Bench below image dissector electronics	0.61	0.18	0.50	0.0	0.50	0.19
Bench near motor encoder A	0.39	0.0	0.39	0.0	0.39	0.37
Motor encoder housing	0.0	0.0	0.0	0.0	0.0	0.0
PMT	0.39	0.0	0.22	0.19	0.22	0.0
Keel near D Fitting	0.17	0.0	0.39	0.0	0.39	0.18
Graphite epoxy oven near the optical control system	0.39	0.0	0.22	0.18	0.22	0.0

Fine Guidance Sensor	Average PMT Counts	Visual Magnitude	Number of Observations^a	Standard Deviation (% of Average Counts)
1	322	12.7	5	0.46
1	1048	11.4	4	0.44
1	982	11.5	4	0.32
1	305	12.7	5	0.28
1	836	11.6	4	0.21
2	195	13.0	3	0.44
2	268	12.7	4	0.35
2	391	12.3	4	0.47
2	742	11.6	4	0.21
3	509	12.4	5	0.72
3	447	12.6	5	0.63
3	474	12.5	4	0.66
3	1246	11.5	4	0.39
3	603	12.2	4	0.45
3	4659	10.0	4	0.47

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Applied Optics