(08 May 2026, initial version by Aki Takeda)
Initial purpose was to confirm the stray light level of the phase 7 (since 11-May-2024) after two years. This year, we have multiple HOPs to support in early May and thus the data volume was not enough to perform as many stray light measurements as we did in the past years. The 2026 CCD bakeout schedule was not favorable for the stray light measurements.
| ID No. | date & time (UT) | XOB | purposes (link: obtained plots ) | memo |
| 1 | 3-May-2026, 17:47:00 | 1D4B | light crv., Al-mesh (1.4s) and Al-poly (2.0s) at DC. | previous bakeout + 11 days. |
| 2 | 4-May-2026, 18:18:30 | 1D4C | light crv., thin-Be (11.3s) at DC. | prev. b.o. + 12 days. |
| 3 | 5-May-2025, 18:50:00 | 1D4B | light crv., Al-mesh (1.4s) and Al-poly (2.0s) at W-limb. | prev. b.o. + 13 days. |
| 4 | 8-May-2026, 18:46:30 | 1D4B | light crv., Al-mesh (1.4s) and Al-poly (2.0s) at E-limb | prev. b.o. + 16 days. |
| 5 | 9-May-2026, 17:39:30 | 1D4B | light crv., Al-mesh (1.4s) and Al-poly (2.0s) at S-limb | prev. b.o. + 17 days. |
| 6 | 11-May-2026, 00:43:30 | 1D4C | light crv., thin-Be (11.3s) on AR. | prev. b.o. + 19 days. |
| 7 | 11-May-2026, 18:43:00 | 1D4B | light crv., Al-mesh (1.4s) and Al-poly (2.0s) at (-800,-520) | prev. b.o. + 19 days. |
| 8 | 12-May-2026, 17:36:00 | 1D4B | light crv., Al-mesh (1.4s) and Al-poly (2.0s) at N-pole | prev. b.o. + 20 days. |
| 9 | 13-May-2026, 18:07:30 | 1D4B | light crv., Al-mesh (1.4s) and Al-poly (2.0s) at (810, 430) | prev. b.o. + 21 days. |
| 10 | 14-May-2026, 00:40:00 | 1D4B | light crv., Al-mesh (1.4s) and Al-poly (2.0s) at on AR | prev. b.o. + 22 days. |
| 11 | 14-May-2026, 18:38:30 | 1D4B | light crv., Al-mesh (1.4s) and Al-poly (2.0s) at on AR | prev. b.o. + 23 days. |
| 12 | 15-May-2026, 19:21:00 | 1D4B | light crv., Al-mesh (1.4s) and Al-poly (2.0s) at on AR | prev. b.o. + 24 days. |
| 13 | 10-May-2025, 17:48:30 | 1D32 | light crv., thin-Be (11.3s) at E-limb | prev. b.o. + 10 days. |
| 14 | 11-May-2025, 18:21:00 | 1D32 | light crv., thin-Be (11.3s) at N-limb | prev. b.o. + 11 days. |
| 15 | 12-May-2025, 17:15:00 | 1D32 | light crv., thin-Be (11.3s) at S-limb | prev. b.o. + 12 days. |
| 16 | 23-Jul-2025, 18:24:00 | 1D31 | light crv., Al-poly/Ti-poly (4.0s) and Al-poly (2.0s) at (-530,530) | prev. b.o. + 0 days. |
The stray light component included in the Al_mesh filter was at the same level as that of 2024. The new stray light pattern started to appear since 2023 on the E-limb images was reproduced.
- DC pointings
[NOTE] pnt. indicates the satellite pointing at the time of
data acquisition, i.e., (index.xcen, index.ycen) corrected by the
the coalignment DB.
- limb pointings
| Al-mesh, 20250506(1.4s) [pbo+6d] pnt.(-33.1,955.5) |
Al-mesh, 20250506(1.4s) [pbo+6d] pnt.(3.7,-926.0) |
Al-mesh, 20250506(1.4s) [pbo+6d] pnt.(-983.9,-3.5) |
Al-mesh, 20250507(1.4s) [pbo+7d] pnt.(933.2,34.1) |
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- Other pointings
| Al-mesh, 20250508(1.4s) [pbo+8d] pnt.(-23.1, -477.1) |
Al-mesh, 20250508(1.4s) [pbo+8d] pnt.(-40.7, 413.8) |
Al-mesh, 20250723(1.4s) [pbo+0d] pnt.(-547.5, 557.1) |
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- DC pointings
- limb pointings
| Al-poly, 20250506(2.0s) [pbo+6d] pnt.(-33.1,955.5) |
Al-poly, 20250506(2.0s) [pbo+6d] pnt.(3.6,-926.0) |
Al-poly, 20250506(2.0s) [pbo+6d] pnt.(-983.9,-3.5) |
Al-poly, 20250507(2.0s) [pbo+7d] pnt.(933.2, 34.1) |
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- Other pointings
| Al-poly, 20250508(2.0s) [pbo+8d] pnt.(-32.8, 12.9) |
Al-poly, 20250508(2.0s) [pbo+8d] pnt.(-40.7, 413.8) |
Al-poly, 20250723(2.0s) [pbo+0d] pnt.(-547.5, 557.1) |
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- DC pointings
| thin_Be,20250504(11.3s) phase 7, pnt.(-15.5,12.8) |
thin_Be,20240505(11.3s) phase 6, pnt.(-16.5, 14.4) |
After PREP comparison with phase 7 & 6 |
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- limb pointings
| med_Be,20250505 (22.6s), pnt.(-16.4,14.0) |
med_Be,20240506 (22.6s), pnt.(-15.3, 15.5) |
After PREP comparison with phase 7 & 6 |
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| med_Al,20250506 (32.7s), pnt.(-14.4, 14.8) |
med_Al,20210512 (32.7s), pnt.(-17.0, 14.4) |
After PREP comparison with phase 7 & 6 |
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| Apol+Tpol,20250508 (4.0s), pnt.(-32.8,12.9) |
Apol+Tpol,20220712 (4.0s), pnt.(-20.0, 29.0) |
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