Flux Calibration
Due to recent improvements to the stellar atmospheric models for the primary standard stars, CALSPECv11, as well as the re-examination of the Vega spectral flux, the STIS instrument team is working to update the flux calibration and zeropoints for all affected modes.
Team Lead: Joleen Carlberg
Recalibration Lead: Matthew Siebert
Implementation Timeline for Flux Calibration Changes
The STIS team has worked towards prioritizing the most impacted and widely used modes, both spectroscopic and imaging. We detail the planned releases below that will include the new sensitivity curves (for spectroscopic modes) and photometry keyword tables (for imaging modes). The timeline for this implementation is tentative and subject to change.
| Release | Target Date | Description | Status |
|---|---|---|---|
| 1st Release | April 2022 |
High Priority Spectroscopic MAMA/CCD Modes |
Complete |
| 2nd Release | November 2022 | High Priority Echelle Modes (January 2023 STAN; May 2023 STAN) |
Complete |
| 3rd Release | July 2023 | NUV-MAMA Imaging Modes & Lower Priority Echelle Modes (July 2023 STAN) | Complete |
| 4th Release | May 2025 | First Order M-Modes | Complete |
| 5th Release | Fall 2025 | Remaining E230H cenwaves | Ongoing |
| 6th Release | TBD | FUV-MAMA/CCD Imaging Modes | Ongoing |
| Mode | Detector | Filter/Grating | Cenwave | Release | Status |
|---|---|---|---|---|---|
| Spectroscopic/Long Slit | FUV-MAMA | G140L | 1425 | 1st Release | Complete |
| Spectroscopic/Long Slit | FUV-MAMA | G140M | All primary | 4th Release | Complete |
| Spectroscopic/Echelle | FUV-MAMA | E140M | 1425 | 1st Release | Complete |
| Imaging | FUV-MAMA | F25SRF2 | 6th Release | Ongoing | |
| Imaging | FUV-MAMA | F25QTZ | 6th Release | Ongoing | |
| Imaging | FUV-MAMA | 25MAMA | 6th Release | Ongoing | |
| Spectroscopic/Long Slit | NUV-MAMA | G230L | 2376 | 1st Release | Complete |
| Spectroscopic/Long Slit | NUV-MAMA | G230M | All primary | 4th Release | Complete |
| Spectroscopic/Echelle | NUV-MAMA | E230M | 1978/2707 | 2nd Release | Complete |
| Spectroscopic/Echelle | NUV-MAMA | E230M | 2415 | 2nd Release | Complete |
| Spectroscopic/Echelle | NUV-MAMA | E230H | 2713/2263 | 3rd Release | Complete |
| Spectroscopic/Echelle | NUV-MAMA | E230H | All remaining cenwaves |
5th Release | Ongoing |
| Imaging | NUV-MAMA | F25QTZ | 3rd Release | Complete | |
| Imaging | NUV-MAMA | F25SRF2 | 3rd Release | Complete | |
| Imaging | NUV-MAMA | F25CN182 | 3rd Release | Complete | |
| Imaging | NUV-MAMA | F25CN270 | 3rd Release | Complete | |
| Spectroscopic/Long Slit | CCD | G750L | 7751 | 2nd Release | Complete |
| Spectroscopic/Long Slit | CCD | G430L | 4300 | 1st Release | Complete |
| Spectroscopic/Long Slit | CCD | G230LB | 2375 | 1st Release | Complete |
| Spectroscopic/Long Slit | CCD | G430MB | All cenwaves | 4th Release | Complete |
| Spectroscopic/Long Slit | CCD | G430M | All cenwaves | 4th Release | Complete |
| Spectroscopic/Long Slit | CCD | G750M | All primary, 6094/6581/8561 |
4th Release | Complete |
| Imaging | CCD | 50CCD | 6th Release | Ongoing | |
| Imaging | CCD | F28x50LP | 6th Release | Ongoing | |
| Imaging | CCD | F28x50OIII | 6th Release | Ongoing | |
| Imaging | CCD | F28x50OII | 6th Release | Ongoing |
NOTE: The STIS Team has yet to determine a release number for any STIS modes not listed in the table above.
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