Standard Star Photometry¶

Standard Star Lists¶

SDSS griz + UKIDSS Yab¶

• README-standard_stars_sdss_sv_v1.txt

• standard_stars_sdss_sv_v1.csv (77MB)

• standard_stars_sdss_sv_v1.fits (57MB)

DECam (u)grizY¶

Soon!

RASICAM Video Archive¶

• RASICAM on YouTube

Overview of Photometric Standards Module (PSM) Results:¶

• 2012-11-01: excellent!

• 2012-11-02: very good!

• 2012-11-03: excellent!

• 2012-11-04: g has strange residuals vs. x,y position on focal plane; otherwise very good!

• 2012-11-05: excellent!

• 2012-11-06: excellent!

• 2012-11-07: bad - solutions affected by light clouds (cirrus) at beginning of night

• 2012-11-08: very bad - solutions affected by light clouds (cirrus) during second half of night

• 2012-11-09: fits appear to be good, but the results are weird (e.g., very large extinctions)

• 2012-11-10: generally very good; z-band fit is OK, but not great.

• 2012-11-11: good in g, OK in r, possible evidence of a jet contrail or band of cirrus passing through i and z std star exposures

• 2012-11-12: very good!

• 2012-11-13: very good in g,i,z; OK in r

• 2012-11-14: excellent!

• 2012-11-15: excellent! Poor astrometry(?) in CCD 61.

• 2012-11-16: very good in i, OK in g and r, marginal in z; high values for first-order extinction (k) in all filters. Poor astrometry(?) in CCD 61.

• 2012-11-17: very good in g,r,i; OK in z. Poor astrometry(?) in CCD 61.

• 2012-11-18: excellent! Poor astrometry(?) in CCD 61.

• 2012-11-19: excellent in g, i, z; very good in r. Poor astrometry(?) in CCD 61.

• 2012-11-20: PSM was not run on this night due to insufficient number of standard star frames (from the DESDM SV-Nov2012-A FirstCut Production Runs webpage

• 2012-11-21: excellent!

• 2012-11-22: not so good, especially in r; a band of cirrus or a jet contrail affecting some of the standard star observations???

• 2012-11-23: very good.

• 2012-11-24: reasonably good -- but TASCA showed a fair amount of cirrus (apparently when standard star fields were not being observed)

• 2012-12-02: excellent in g, r, i; very good in z.

Detailed Night-to-Night Results¶

• MJD 56233 (Evening of 2012-11-01 to morning of 2012-11-02)

• MJD 56234 (Evening of 2012-11-02 to morning of 2012-11-03)

• MJD 56235 (Evening of 2012-11-03 to morning of 2012-11-04)

• MJD 56236 (Evening of 2012-11-04 to morning of 2012-11-05)

• MJD 56237 (Evening of 2012-11-05 to morning of 2012-11-06)

• MJD 56238 (Evening of 2012-11-06 to morning of 2012-11-07)

• MJD 56239 (Evening of 2012-11-07 to morning of 2012-11-08)

• MJD 56240 (Evening of 2012-11-08 to morning of 2012-11-09)

• MJD 56241 (Evening of 2012-11-09 to morning of 2012-11-10)

• MJD 56242 (Evening of 2012-11-10 to morning of 2012-11-11)

• MJD 56243 (Evening of 2012-11-11 to morning of 2012-11-12)

• MJD 56244 (Evening of 2012-11-12 to morning of 2012-11-13)

• MJD 56245 (Evening of 2012-11-13 to morning of 2012-11-14)

• MJD 56246 (Evening of 2012-11-14 to morning of 2012-11-15)

• MJD 56247 (Evening of 2012-11-15 to morning of 2012-11-16)

• MJD 56248 (Evening of 2012-11-16 to morning of 2012-11-17)

• MJD 56249 (Evening of 2012-11-17 to morning of 2012-11-18)

• MJD 56250 (Evening of 2012-11-18 to morning of 2012-11-19)

• MJD 56251 (Evening of 2012-11-19 to morning of 2012-11-20)

• MJD 56252 (Evening of 2012-11-20 to morning of 2012-11-21)

• MJD 56253 (Evening of 2012-11-21 to morning of 2012-11-22)

• MJD 56254 (Evening of 2012-11-22 to morning of 2012-11-23)

• MJD 56255 (Evening of 2012-11-23 to morning of 2012-11-24)

• MJD 56256 (Evening of 2012-11-24 to morning of 2012-11-25)

• MJD 56264 (Evening of 2012-12-02 to morning of 2012-12-03)

• MJD 56265 (Evening of 2012-12-03 to morning of 2012-12-04)

• MJD 56266 (Evening of 2012-12-04 to morning of 2012-12-05)

Trend Analysis¶

• Historical

• Photometric calibrations from SV Nights 1 and 2 (Report to Calibration Group, 9 Nov 2012)

• Trends for Nov 1-7

• "Starflat" trends for Nov 1-14

• DES-SDSS Color Terms

• BD+17 4708

• StarFlatResiduals.tar.gz : gzipped tar file containing all the good-solution residual tables from Nov 1-19 (use columns "res", "X", "Y" for generating a first-iteration star flat illumination correction).

• PSM_res_Nov1-6i.tar.gz : same as StarFlatResiduals.tar.gz, but using updated standard stars table ("Marriner Stripe 82"), and only for i-band date and only including good-solution residual tables from Nov 1-6.

• PSM_res_Nov1-6i-New.tar.gz : same as PSM_res_Nov1-6i.tar.gz, but with additional columns for the CCD coordinate system (x_ccd, y_ccd) as well as in the Focal Plane coordinate system (X_fp, Y_fp).

• Zeropoint trends for Nov 1-19 (Added 26 Dec 2012)

• StarFlatResiduals-Y.tar.gz : gzipped tar file containing all the good-solution residual tables from Nov 1-19 for Y-band (use columns "res", "X", "Y" for generating a first-iteration star flat illumination correction).

• Standard Star Evening Twilight Tests

Mean Photometric Standard Star Module (PSM) Solutions (mean zeropoints, color terms, extinctions) for Nov 1-19, 2012¶

The following take DECam instrumental mags and convert them into SDSS ugriz (and UKIDSS Yab) mags,
using the site/instrument-average zeropoints, color terms, and extinctions for the nights of
Nov 1-19, 2012:

• psmFitDES-mean-u.csv

• psmFitDES-mean-g.csv

• psmFitDES-mean-r.csv

• psmFitDES-mean-i.csv

• psmFitDES-mean-z.csv

• psmFitDES-mean-Y.csv

The zeropoints assume sextractor was run on the data using the default sextractor
zeropoint of 25.0. See Slides 13 and 14 of DES-docdb#7207 --

• http://des-docdb.fnal.gov:8080/cgi-bin/ShowDocument?docid=7207 (internal DES)
• http://des-docdb.fnal.gov/cgi-bin/ShowDocument?docid=7207 (public)

-- on the format of the photometric equations.

Attached Files¶