QM users will not be charged time (i.e. do not have to include it in
Phase 1 or 2) for standard calibrations, which are:
Important: it is the PI's responsibility to assign
a proper SDSS field to each science field (see Sect. 3.2).
In general, the standard stars field should be the closest SDSS field to the target.
If the target itself is in the SDSS area, its field may be used as the calibrator. The SDSS imaging coverage can be found, for example, here:
We do not recommend to pick up calibrators in the narrow “stripes” of the survey.
- 10 frames per each run.
- Dark frame
- 5 frames of 300 sec per run.
- Dome flat
- for each run, dome flats for all 5 or 6 filters will be
taken, but only one per night.
- Standard stars
- every night at least 3-4 exposures of SDSS fields,
30 sec each. Additionally, a 30-sec exposure every time when proposal ID, filter
or target is changed.
For narrow-band observations, spectrophotometric standard stars will be observed just before and after science observations and shared by multiple programs. While PIs will not be charged the default standard star frames, those who want to obtain a specific object as a standard star can set a custom calibration, which will be charged to their program.
Customized standard star calibrations (not an SDSS field, different exposure
time, etc.) are allowed, but are treated as additional observations. They should be
included in the proposal, separate OBs should be prepared, and time will be charged
in the same way as if it were a science target.
The above calibration procedure is not guaranteed for NBFs. Please contact SOD or QWG.