Description
High resolution observation (~0.7 km / pixel) during fly-by. Circular orbit synchronized on Phobos (Phobos quasi-synchroneous orbit), the spacecraft is depointed to follow Phobos.
The telemetry file contains two sessions: first a single-pixel track, then an image-cube. Intermediate calibration sessions include several series of 10 spectra of Phobos, that are not calibrated (see this page for details).
Observations
| Name | Date | Spectra | Window size | Phase angle | Solar Meridian | Ls | Mars-Sun dist (au) |
| PHObos window | 25/03 | 600 | 24 x 25 | 28°-31.5° | ~160° | 17.5° | 1.599 |
| Phobos track (PhT), uncalibrated | 25/03 | 298 | 298 x 1 | 15°-21° | ~160° | 17.5° | 1.599 |
Special corrections
Single-pixel track:
- The average phase angle is 20°, Phobos distance is about 190 km, with Mars on the background.
- All spectra are acquired on Phobos.
- Dark current file: fond1403.dg2
- Gain = 2
- Focal plane temperature = -77.4 °C
- The Phobos track is contamined by Marsshine, and is not calibrated.
- Location of pixels on Phobos is not accurately determined.
Image-cube:
- The average phase angle is 30°, Phobos distance is about 220 km.
- About 400 spectra are acquired on Phobos, the other 200 on the dark sky.
- Dark current file: fond2103.dg3
- Gain = 3
- Focal plane temperature = -76.7 °C
- A special processing is applied to register spectral channels (spatial convolution applied by program CorPho.for to minimize registration discrepancies). Registered/convolved data are provided in files PHOEVEN.RES and PHOODD.RES.
- Four different coordinate files are provided for this session, to plot either maps or camera-view of the image cube. See PHO_COOR.LBL.
- Observations are performed at gain 3, but are recalibrated: the uncertainty on gain 3 coefficients does not affect this session.
Files
| Telemetry file | Edited data (track) | Edited data (image-cube) | Calibrated data (image-cube) | Coordinates image-cube) | |
| Data file | PHOB2503.DAT | PHTEVEN.EDT PHTODD.EDT |
PHOEVEN.EDT PHOODD.EDT PHOEVEN.RES PHOODD.RES |
PHOEVEN.CAL PHOODD.CAL |
PHO_COOR.DAT PHO_SCOR.DAT PHO_SCRN.DAT PIXLOC.CTR |
| Label | RAW_DATA.LBL | PHT_EDT.LBL | PHO_EDT.LBL PHO_RES.LBL |
PHO_CAL.LBL | PHO_COOR.LBL |
