Average ACIS focal plane temperature during science and calibration source observations. The top panel is the full history of FP temperature since January 2000. The bottom panel is the most recent data, with the dotted vertical line indicating the times of spacecraft events that effect focal plane temperature.
| Time Period | Science Observations | ECS Measurements | |
|---|---|---|---|
| 2007.27-2008.27 | Year before DH heater shutoff | 334/904 (37%) | 106/232 (46%) |
| 2008.27-2009.34 | After DH heater shutoff | 16/848 (2%) | 33/219 (15%) |
| 2009.34-2009.58 | Backoff time reduced to 5 hrs | 17/192 (9%) | 28/67 (42%) |
| 2009.58-2009.62 | Constrained to tail-sun attitudes | 13/27 (48%) | 5/11 (45%) |
| 2009.62-2009.68 | SIM FA6 heater turned off | 4/44 (9%) | 4/14 (29%) |
| 2009.68- | Tail-sun constraints removed | 2/106 (2%) | 4/33 (12%) |
Updated monthly.
The data used to make these plots can be found here
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