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--- en:news:urat1_catalog [2015/04/23 21:00] – created pch
+++ en:news:urat1_catalog [2015/11/06 20:43] (current) – external edit 127.0.0.1
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-~~NOTOC~~
 ====== URAT 1 ======
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 significant improvement in positional precision as compared to UCAC.
-{{ :en:screenshot:x010_m13_urat1.png?350|}}
+{{ :en:screenshot:x010_m13_urat1.jpg?350|M13 with URAT1 catalog}}
   * Observational catalog, i.e. mean positions of stars at mean epoch of URAT observing (between 2012.3 and 2014.6), on the International Celestial Reference System (ICRS).
@@ Line 37: / Line 35: @@
   * Photometry from 2MASS and American Association of Variable Star Observers Photometry All-Sky Survey (APASS) is added for stars in common
-===== Access the catalog from Vizier =====
+Read more details at http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/urat \\ and http://cdsarc.u-strasbg.fr/viz-bin/Cat?I/329
+===== Access the catalog online from Vizier =====
+You can show the URAT1 catalog data for a specific area in Skychart without downloading the full catalog by using the [[en:documentation:catalog#vo_catalog|Virtual Observatory interface]].
+Start by zooming to a small sky area of the northern hemisphere, about 30 arcmin width, use preferably Equatorial coordinates.\\
+Be sure the button "Show Virtual Observatory data" is checked.{{:en:news:vo_urat0.png|}}\\
+Open the menu Setup -> Catalog -> VO Catalog, click the Add button.
+Type URAT in the search field and click "By name" button, then "Select catalog"\\
+{{:en:news:vo_urat1.png?200|}}
+Select "f.mag" for the magnitude, change Default magnitude to 19, click "Download catalog" \\
+{{:en:news:vo_urat2.png?200|}}
+Be sure the new URAT line is green and click OK.\\
+{{:en:news:vo_urat3.png?200|}}
+The chart now show the URAT1 stars for the selected area. \\
+Save the program options to keep your VO catalog definition for a next time.
+To show the stars for another area, open the menu Setup -> Catalog -> VO Catalog (or right click the "Show Virtual Observatory data" button).\\
+Then click the reload arrow on the right column. When the download is finished click the OK button.
 ===== Build a local catalog for Skychart =====
-Download the data, software and documentation from ftp://cdsarc.u-strasbg.fr/pub/cats/I/329/URAT1/
+Before to start check you have enough disk space available. There is about 17 GB of file to download, then it require 50 GB for the extracted data, and finally 5.8 GB for the Skychart catalog with only a minimal set of data without index.
+Download the data, software and documentation from ftp://cdsarc.u-strasbg.fr/pub/cats/I/329/URAT1/ , for example:
+  mkdir URAT1
+  cd URAT1
+  wget --mirror ftp://cdsarc.u-strasbg.fr/pub/cats/I/329/URAT1/
+  mv cdsarc.u-strasbg.fr/pub/cats/I/329/URAT1/* .
+  cd ..
+In the "access" directory compile the v1dump program. You need a Fortran compiler, for example gfortran, available in every Linux distribution or on Windows with [[https://www.cygwin.com/|Cygwin]] or [[http://www.mingw.org/|Mingw]].\\
+  cd URAT1/access
+  gfortran -o v1dump v1dump.f v1sub.f
+  cd ../..
+For convenience for Windows users you can also download a [[http://www.ap-i.net/pub/skychart/urat/v1dump.zip|precompiled v1dump.exe]]
+Run v1dump to extract the data from the binary files to a new "asc" directory. Response to prompt are in bold.
+  cd URAT1
+  mkdir asc
+  cd access
+  ./v1dump
+  dump URAT binary data to ASCII
+  hit "enter" to accept defaults or enter new values
+  path input = /d01/urat/v12/
+**../v12/**
+  binary data are stored in LINUX-style sequence
+  some computers (PC-style) need a byteflip
+  byte flip (Y/N) ?  N
+**N**
+  path output= ./
+**../asc/**
+  first, last zone (326..900) to handle now =  326 327
+**326 900**
+  enter column separator character (default = blank)
+  begin read file = ../v12/z326
+  ... output to   = ../asc/z326.asc
+  ...
+  ... output to   = ../asc/z900.asc
+  cd ..
+Download the example project file for Skychart Catgen from http://www.ap-i.net/pub/skychart/urat/urat1.prj.zip
+Then use [[en:documentation:catgen|Catgen]] to convert the text files to a binary catalog optimized for chart display.
+  cd URAT1
+  unzip urat1.prj.zip
+  mkdir cat
+  ulimit -S -n 20000
+  skychart
+  Menu : Setup / Catalog / Catalog - Catgen, Load Project -> urat1.prj
+If you use Linux or Mac OS, be sure to read the specific notes in the Catgen documentation page.
-In the "access" directory compile the v1dump program: