Bleed trail artifacts identified as bright stars in 90prime/mosaic

[djschlegel]

Spurious bright stars can be found due to incomplete masking of bleed trails 90prime and/or mosaic images. This doesn't appear to be a problem for decam images. Below are the 15 spurious R<15 stars in 935 bricks of dr9k/north.

   RA                    DEC                 RMAG
   225.57219       42.051660      12.6217 
   224.05478       41.135590      12.6709 
   218.86032       43.031772      12.9813 
   220.97204       40.955396      13.0163 
   224.05095       41.135604      13.0434 
   223.94113       41.136507      13.7033 
   217.38968       41.794339      13.9029 
   219.54944       43.640133      13.9786 
   219.78399       43.075612      13.9862 
   228.15860       41.094272      14.1055 
   218.31279       41.526194      14.5693 
   219.55183       43.639478      14.5883 
   220.24378       44.591116      14.7576 
   215.38792       41.175011      14.8647 
   218.29282       41.525683      14.9424 

[djschlegel]

We still find such sources in dr9m/north. Some are dropped between dr9k -> dr9m, and some new ones are picked up, probably due to the vagaries of the details in each particular case. Here's a list of some new sources picked up between dr9k -> dr9m from the first bricks processed. These are r<17 sources where I'm listed the coordinates, and the r-band magnitudes of all sources within 2 arcsec of that coordinate in dr9m, and then adding a "G2" identifier if one of them is a Gaia source:

215.24201 34.174455 13.3747 16.1237 G2
215.25613 32.217813 13.8184 16.1881 G2
215.14504 33.712779 14.1517 25.0000 G2
215.39804 32.557337 14.0432
215.30221 33.217625 16.1900
215.49940 33.104297 15.4573
215.97860 33.653601 13.3709 16.4074 G2
216.06260 33.978957 16.9040 13.8149 G2
216.11738 34.035838 15.9949 13.2791 G2
216.27225 33.395576 16.2412 13.7476 G2
216.34413 33.549615 13.2346 16.3646 G2
217.16447 33.064700 14.3945
217.27798 34.075926 16.9656
217.31898 32.276351 16.9591
217.52467 32.507309 16.6819
217.52723 33.935676 15.1193
217.62431 32.760057 16.9609
217.78217 33.334431 16.4003 14.0752 G2
217.84505 34.121440 15.1985 16.9120 G2
217.86896 33.398865 16.1880 13.4214 G2
217.98866 34.298950 14.8180 15.8916 G2
217.99464 33.644583 15.1182 16.3503 G2
218.12093 32.081029 15.0767 13.8530 G2
218.06876 33.221059 16.2257
218.07561 32.641704 16.7248 14.2124 G2
217.99646 33.593063 15.4257 25.0000 16.0613 G2
218.05323 33.381013 15.9200 13.6471 G2
218.20255 32.277595 16.6008 13.7058 G2
218.30558 32.907108 15.8582