pan-starrs image processing pipeline
DESCRIPTION
Pan-STARRS Image Processing Pipeline. Astrometry and Photometry. IFA Pan-STARRS Seminar 735. October 14, 2004. Summary of Topics. Astrometry and Photometry Precision Requirements Summary of the AP Survey Achieving the Photometry Goals Achieving the Astrometry Goals. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/1.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
IFA Pan-STARRS Seminar 735October 14, 2004
![Page 2: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/2.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
●●●●
![Page 3: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/3.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
●●●●
![Page 4: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/4.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
●●●●●●
●
![Page 5: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/5.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
● ●galaxy cluster evolution●rare object searches
●high-z QSOs●extremely red galaxies●low-mass objects (L & T dwarfs)●YSOs
![Page 6: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/6.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
![Page 7: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/7.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
●linearize detector flux●apply shutter correction●flatten images●photometer objects●apply image zero point, color correction, airmass correction
![Page 8: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/8.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
●stable light source + variable exposure time?●calibrated light source?
![Page 9: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/9.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
●measure shutter fly-over times: dt(x,y)●apply to flat-field or science images●probably small for 30 second exposures (0.1% = 30 ms jitter●may be significant for 5 second exposures...
![Page 10: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/10.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
●twilight-flat
●pros: continuum source, spatially uniform (usually), bright ●cons: very blue, limited availability, cirrus issues
●dome-flat●pros: continuum source, available anytime, repeatable (?)●cons: spatial structures, low count rates, emission line dangers
●night-sky flat●pros: obtained 'automatically'●cons: low count rates, stellar contaminations,
spatial structures unknown, emission line source
![Page 11: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/11.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
●correct for geometrical distortion & scattered light●stability time scale?
![Page 12: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/12.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
●chip-to-chip color terms (possibly linear, small)●internal system vs external system●external transformations are often ambiguous
![Page 13: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/13.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
●use relative photometry with reference overlaps●measure zero points & atmospheric corrections, apply●combination method (relphot + uniphot)
![Page 14: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/14.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
●system zero-points vary ~0.1 mag on timescales ~ 100 days
![Page 15: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/15.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
●variations in time : Cf(t)●variations in space : Cf(ra,dec)●these variations are NOT strongly correlated
![Page 16: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/16.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
![Page 17: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/17.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
●
●●●
●●●
![Page 18: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/18.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
●●●●
![Page 19: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/19.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
● ●high-quality grid for weak-lensing (starting point)●stellar matching in crowded fields
![Page 20: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/20.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
●
●●●
●●●
![Page 21: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/21.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
●●●●
![Page 22: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/22.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
●●●
●●●●●●●
![Page 23: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/23.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
●
![Page 24: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/24.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
●
![Page 25: Pan-STARRS Image Processing Pipeline](https://reader036.vdocuments.net/reader036/viewer/2022062400/56814cfb550346895dba119b/html5/thumbnails/25.jpg)
Pan-STARRS Seminar: IPP Eugene Magnier
●
●●●●
●●●