Cold time is defined as any temperature reading <= -119.2 degrees C.
We are operating on 6 month epochs. The epochs start on the following Days of the Year:
DOY 032 and DOY 213.
The present epoch begins at: 2021:032:00:00:00.00 and today is: 2021:081:11:26:26.833 .
It is important to note that the target exposure times listed below will increase by a factor
of 12% every 6 month epoch due to the half-life of the calibration source.
| Chip | Required (seconds) | Achieved (seconds) |
|---|---|---|
| I0 | 160000.0 | 6559.4 |
| I1 | 160000.0 | 14708.2 |
| I2 | 160000.0 | 14708.2 |
| I3 | 160000.0 | 14708.2 |
| S0 | 80000.0 | 14874.3 |
| S1 | 100000.0 | 14874.3 |
| S2 | 160000.0 | 21433.7 |
| S3 | 200000.0 | 29582.5 |
| S4 | 80000.0 | 14874.3 |
| S5 | 80000.0 | 14874.3 |
| Recovered Science Time (seconds): | 11882.0 |
|---|
| SI Mode | Total Number of Obs. | Total Exposure Time (sec) | Average Exposure (sec/obs) |
|---|---|---|---|
| Primary 6 Chip SI Modes | |||
| TE_007AC | 11 | 62535.40 | 5685.04 |
| TE_007AE | 10 | 68647.20 | 6864.72 |
| TE_00B26 | 10 | 62669.00 | 6266.90 |
| Old 6 Chip SI Modes | |||
| TE_00216 | 0 | 0.00 | 0.00 |
| TE_0021C | 0 | 0.00 | 0.00 |
| TE_008EA | 0 | 0.00 | 0.00 |
| 5 Chip SI Modes | |||
| TE_00C60 | 1 | 9717.00 | 9717.00 |
| TE_00CA8 | 1 | 9717.00 | 9717.00 |
| 4 Chip SI Modes | |||
| TE_00C62 | 5 | 41884.40 | 8376.88 |
| Totals: | 38 | 255170.00 | 6715.00 |
Rule #1: The key time period for balancing SI mode statistics is the 6 month Epoch
By the end of the epoch, the SI mode statistics should match the rules stated below.
Rule #2: Each of the three, default, 6 chip, SI modes (or their 5 chip equivalents) must be used
at least once in each load week.
- If two SI modes are lagging in either cold time or total time, apportion the week's ECS
measurements between the two of them roughly commensurate with the amount they are lagging.
- The 6 month Epoch allows "even" correction of two lagging SI modes. No
need to pile a weeks worth of ECS measurements on one SI mode if two are lagging.
Rule #3: Make certain to spread the amount of COLD ECS time as evenly as possible across all three SI modes
Balance Cold measurement data between the three default 6-chip modes within 10%
of each other on an Epoch basis
Rule #4: Spread the amount of *Total* ECS time as evenly as possible across all three SI modes.
- Balance Total measurement data between the three default 6-chip modes within 10%
of each other on an Epoch basis.
Rule #3 takes precedence over Rule #4.
Rule #5:At least 60% of scheduled ECS measurement time must be -119.2 deg. C
Rule #6: Any ECS measurements during a Perigee Passage that are cold MUST be assigned to the nominal
ECS run SI modes. i.e. Any requested Rawmode runs can be done with a warm focal plane.
All of the TE_00CA8s get counted as TE_007AE
Half of the TE_00C60s get counted towards TE_007AC and the other half get counted with the TE_00B26s
Half of the TE_00C62s get counted towards TE_007AC and the other half get counted with the TE_00B26s.
So watchout for TE_00B26 over-representation.