This is the Executed Observation History per AOT file. One of its uses was to transfer what was known as TDATA between the uplink and downlink parts of the system. TDATA, or `Transparent Data', is information about the observation that did not need to be uplinked to the satellite but that was needed to process the data. It was `transparent' (not looked at) to the spacecraft controllers. Such data include the proposer ID, proposal ID, etc. Its main use was in defining the time limits of observations to show how ISO telemetry was divided.
The EOHA file contains a primary header with the fields described in Table D.10. In this example non-mandatory fields are filled with example values.
| Keyword | Value | Description |
| SIMPLE = | T | / |
| BITPIX = | 8 | / |
| NAXIS = | 0 | / |
| EXTEND = | T | / |
| ORIGIN = | 'ESA ' | / European Space Agency |
| TELESCOP = | 'ISO ' | / Infrared Space Observatory |
| COMMENT | Attributes of instantiated Observations | |
| FILENAME = | 'EOHA264 ' | / File name in ISO archive |
| DATE = | '09/07/95' | / Creation date |
| FILEVERS = | '0298 ' | / Version ID in ISO archive |
| OLPVERS = | 'OLP_21 ' | / SOC OLP system version |
| CALGVERS = | 'CALG_31 ' | / SOC OLP CAL-G files version |
| USERNAME = | 'PIPELINE' | / |
The EOHA file contains records described in Table D.11.
| Keyword | Number | Format | Description |
| EOHATDTN | 1 | A6 | TDT number |
| EOHAUTCS | 1 | A11 | UTC start of observation (yydddhhmmss) |
| EOHAUTCE | 1 | A11 | UTC end of observation (yydddhhmmss) |
| EOHAINST | 1 | A1 | Prime instrument ID |
| EOHANCPU | 1 | A1 | # CAM peak-ups (obsolete) |
| Field is always 0 | |||
| EOHARES | 1 | A14 | Reserved |
| EOHAAOTN | 1 | A4 | AOT name |
| EOHAPRID | 1 | A8 | Proposer ID |
| EOHAPLID | 1 | A8 | Proposal ID |
| EOHAOSN | 1 | A2 | Observation Sequence Number (OSN) |
| EOHAPSN | 1 | A2 | Pointing Sequence Number (PSN) (obsolete) |
| Field is always 0 | |||
EOHAPCAT |
1 | A1 | Proposal category |
| EOHACIND | 1 | A1 | Calibration indicator |
| EOHATNAM | 1 | A16 | Target name |
EOHASCAT |
1 | A3 | Scientific category |
| EOHALIND | 1 | A2 | Link indicator |
| EOHASPAR | 1 | A5 | Spare area within observation description |
| EOHAAOTV | 1 | A64 | AOT/COT variable information (instrument specific) |
CAM AOT specific information, kept in the 64 bytes of EOHAAOTV, is described in Table D.12.
| Number | Format | Description |
| 2 | I2 | Raster size |
| 1 | I5 | Observation duration in seconds (not including slew) |
| 1 | A11 | Timestamp of AOT to OCT logic |
| 1 | A5 | AOT/CO to OCT logic version as xx.yy |
| 1 | A5 | Unused |
| 1 | A34 | Unused |
LWS AOT specific information, kept in the 64 bytes of EOHAAOTV, is described in Table D.13
| Number | Format | Description |
| 2 | I2 | Raster size |
| 1 | I5 | Observation duration in seconds (not including slew) |
| 1 | A11 | Timestamp of AOT to OCT logic |
| 1 | A5 | AOT/CO to OCT logic version as xx.yy |
| 1 | A5 | Unused |
| 1 | I1 | FPS use flag `1' yes, `0' no and blank for grating |
| 1 | I1 | FPL use flag `1' yes, `0' no and blank for grating |
| 1 | I2 | Spare |
| 1 | I2 | Total number of spectra to be obtained in this observation |
| 1 |
I2 | Start detector for an L01 AOT |
| 1 |
I2 | End detector for an L01 AOT |
| 1 |
I4 | Start zone to cover the L03 wavelength range |
| 1 | I4 | End zone to cover the L03 wavelength range |
| 1 | I4 | First zone for FPL for L03 and L04 |
| 1 | F8.4 | Start wavelength of requested range for L01 and L03 |
| 1 | F8.4 | End wavelength of requested range for L01 and L03 |
PHT AOT specific information, kept in the 64 bytes of EOHAAOTV, is described in Table D.14
| Number | Format | Description |
| 2 | I2 | Raster size |
| 1 | I5 | Observation duration in seconds (not including slew) |
| 1 | A11 | Timestamp of AOT to OCT logic |
| 1 | A5 | AOT/CO to OCT logic version as xx.yy |
| 1 | A5 | Unused |
| 1 | I2 | Spare |
| 1 | A5 | Number of measurements in observation |
| 1 | I1 | Number of sub-observations making up this observation |
| 1 | I1 | Calibration Sequence used (1-6) |
| 1 | A25 | Unused |
SWS AOT specific information, kept in the 64 bytes of EOHAAOTV, is described in Table D.15
| Number | Format | Description |
| 2 | I2 | Raster size |
| 1 | I5 | Observation duration in seconds (not including slew) |
| 1 | A11 | Timestamp of AOT to OCT logic |
| 1 | A5 | AOT/CO to OCT logic version as xx.yy |
| 1 | A5 | Unused |
| 1 | I7 | Radial velocity provided by observer in km/s |
| 1 | A27 | Unused |