ObsHistory¶
This table keeps a record of each visit made by the observatory during a simulated survey. Multiple proposals can be associated with a single visit leading to duplicate entries in this table.
| Column | Description |
|---|---|
| observationId | Numeric identifier for an observation entry. |
| Session_sessionId | The simulation run session Id. |
| night | The night in the survey for the observation. Starts from 1. |
| observationStartTime | The UTC start time for the observation (units=seconds). This occurs after the slew but before the first exposure. |
| observationStartMJD | The Modified Julian Date at observation start (units=seconds). |
| observationStartLST | The Local Sidereal Time at observation start (units=degrees) |
| TargetHistory_targetId | Numeric identifier that relates to an entry in the TargetHistory entry. |
| Field_fieldId | Numeric identifier that relates to an entry in the Field table. |
| groupId | Group Id for the observation. This is non-zero and repeated for field/filter combinations collected in sets of N (tuples or sequences). It is zero when N equal one. |
| filter | The one character name for the band filter. |
| ra | The Right Ascension of the observation (units=degrees). |
| dec | The Declination of the observation (units=degrees). |
| angle | The Position Angle of the observation (units=degrees). |
| altitude | The altitude of the observation (units=degrees). |
| azimuth | The azimuth of the observation (units=degrees) |
| numExposures | The number of exposures taken for the observation. |
| visitTime | The total time for the observation (units=seconds) including exposure, shutter and readout time. |
| visitExposureTime | The sum of all the exposure times for the observation (units=seconds). No shutter and readout time included. |
| airmass | The airmass of the observation field. |
| skyBrightness | The calculated skybrightness for the observation field. |
| cloud | The fraction of clouds present (0: none to 1: total). |
| seeingFwhm500 | The full-width at half-maximum for seeing observations at 500 nm at zenith. |
| seeingFwhmGeom | “Geometrical” full-width at half-maximum, actual half width at maximum brightness. This can be used to represent the FWHM of a double Gaussian representing the physical width of a PSF. |
| seeingFwhmEff | “Effective” full-width at half-maximum, typically ~15% larger than seeingFwhmGeom. This can be used to calculate SNR for point sources, using seeingFwhmEff as the FWHM of a single Gaussian describing the PSF. |
| fiveSigmaDepth | The magnitude of a point source that would be a 5-sigma detection (units=magnitudes) |
| moonRA | The right-ascension (units=degrees) of the moon. |
| moonDec | The declination (units=degrees) of the moon. |
| moonAlt | The altitude (units=degrees) of the moon. |
| moonAz | The azimuth (units=degrees) of the moon. |
| moonDistance | The distance (units=degrees) between the moon and the observation field. |
| moonPhase | The phase of the moon. |
| sunRA | The right-ascension (units=degrees) of the sun. |
| sunDec | The declination (units=degrees) of the sun. |
| sunAlt | The altitude (units=degrees) of the sun. |
| sunAz | The azimuth (units=degrees) of the sun. |
| solarElong | The solar elongation (units=degrees) of the observation field (distance between it and sun). |