Tom Droege has graciously made available for general consumption a set of images taken with his triplet on several nights during February, 1997. I have tried to gather together the images themselves, and as many different reductions of them as I could find.
Table of contents.
Here's a table of the images, with dates, times, filters, etc.
# H = high galactic latitude # L = low galactic latitude # # the "RA" and "Dec" values are at the rough center of each image # pixel # name date time camera RA Dec sky skysig FWHM g0483967.fts 03-02-1997 11:13:48 0 I H 202.34 -1.90 -27918 55 3.4 g0483977.fts 03-02-1997 11:27:04 0 I H 205.67 -1.90 -28511 50 3.5 g0493669.fts 13-02-1997 04:03:37 0 I L 104.16 -1.88 -27710 104 3.6 g0493678.fts 13-02-1997 04:16:53 0 I L 107.49 -1.87 -27665 112 3.5 g0493946.fts 13-02-1997 10:42:37 0 I H 204.18 -1.89 -28030 48 3.3 g0493955.fts 13-02-1997 10:55:55 0 I H 207.52 -1.89 -27982 49 3.2 g1493669.fts 13-02-1997 04:03:37 1 V L 119.10 -1.04 -25080 185 2.3 g1493678.fts 13-02-1997 04:16:53 1 V L 122.42 -1.04 -25075 191 2.4 g1493946.fts 13-02-1997 10:42:37 1 V H 219.13 -1.04 -26547 46 2.6 g1493955.fts 13-02-1997 10:55:55 1 V H 222.46 -1.04 -26539 46 2.5 g2483921.fts 03-02-1997 10:07:23 2 I H 199.54 -0.79 -28884 49 3.5 g2483931.fts 03-02-1997 10:20:42 2 I H 202.90 -0.79 -28869 45 3.8 g2493623.fts 13-02-1997 02:57:18 2 I L 101.40 -0.76 -26748 82 4.4 g2493900.fts 13-02-1997 09:36:02 2 I H 201.36 -0.77 -28082 48 3.7 g2493909.fts 13-02-1997 09:49:22 2 I H 204.71 -0.77 -28010 56 3.8
Click on any to download the raw FITS image.
Since several people have asked about "completeness", I have grabbed an image from the Digitized Sky Survey CD-Roms which falls within one of our fields. The images g0493946 and g2493909 should both contain this portion of the POSS. The POSS sub-section has central RA 13h 40m = 205 degrees, and central Dec -1 degree. It is about 90x90 arcminutes in size.
This image has since been deleted ... sorry.
The GIF images displayed below have North at left, East down (similar to TASS images when they are displayed simply). The entire 90x90 arcminute subsection is shown below -- you can click on it to download a larger GIF image (about 450K).
A closeup of the "middle-top" area of the image above, which goes down to the resolution of the original POSS photograph, is shown below. It covers only about 25x25 arcminutes. Note several plate defects! You can click on it to download a larger GIF image (about 460K).
Mike Gutzwiller has detected and measured the properties of stars in these images. His files are ASCII text lists containing info on one star per line; the positions are in pixels, and the magnitudes may be calibrated to values in the SAO catalog. You can read a document describing the data format in Mike Gutzwiller's lists.
Michael Richmond has analyzed these images, too. You can read a description of his work in Technical Note 25. You can grab either the "raw" star lists, which have positions in (row, col), and "instrumental" magnitudes, or "reduced" star lists, which have position in (RA, Dec) equinox 2000, and magnitude calibrated against Landolt standards. Each star list contains a "header" which describes its data format. There are two errors in the star lists:
image raw reduced ------------------------------------------------------ g0483967 g0483967.pht g0483967.ast g0483977 g0483977.pht g0483977.ast g0493669 g0493669.pht g0493669.ast g0493678 g0493678.pht g0493678.ast g0493946 g0493946.pht g0493946.ast g0493955 g0493955.pht g0493955.ast g1493669 g1493669.pht g1493669.ast g1493678 g1493678.pht g1493678.ast g1493946 g1493946.pht g1493946.ast g1493955 g1493955.pht g1493955.ast g2483921 g2483921.pht g2483921.ast g2483931 g2483931.pht g2483931.ast g2493623 g2493623.pht g2493623.ast g2493900 g2493900.pht g2493900.ast g2493909 g2493909.pht g2493909.ast
Glenn Gombert has detected and measured the properties of stars in these images. His files are ASCII text lists containing info on one star per line; the positions are in pixels; I'm not sure if the magnitudes have been calibrated against any standards. You can read a document describing the data format in Glenn Gombert's lists. You can also read Glenn's measurement of FWHM in each image.
Glenn has also produced catalogs with astrometric positions for each star detected in the images.
Glenn has written a note on using WCS parameters in a FITS header, and made a catalog of stars in image g0493946 with calibrated RA and Dec.
Glenn has made a plot showing the variation in PSF over the image "G2493909.fts". You can click on the thumbnail below to see a larger version.
Arne Henden has concentrated on the astrometric performance of the images. You should read Arne Henden's report on the images.
Herb Johnson has compared stars list of the same field which were produced by different people. You should read