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en:news:urat1_catalog [2015/04/23 21:37] admin |
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- | ~~NOTOC~~ | ||
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====== URAT 1 ====== | ====== URAT 1 ====== | ||
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significant improvement in positional precision as compared to UCAC. | 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). | * 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). | ||
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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 | 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 from Vizier ===== | + | ===== 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. | ||
+ | |||
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cd URAT1 | cd URAT1 | ||
wget --mirror ftp://cdsarc.u-strasbg.fr/pub/cats/I/329/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]].\\ | ||
- | 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 Cygwin or Mingw. | ||
cd URAT1/access | cd URAT1/access | ||
gfortran -o v1dump v1dump.f v1sub.f | 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. | + | Run v1dump to extract the data from the binary files to a new "asc" directory. Response to prompt are in bold. |
cd URAT1 | cd URAT1 | ||
mkdir asc | mkdir asc | ||
cd access | cd access | ||
./v1dump | ./v1dump | ||
+ | |||
dump URAT binary data to ASCII | dump URAT binary data to ASCII | ||
hit "enter" to accept defaults or enter new values | hit "enter" to accept defaults or enter new values | ||
- | path input = /d01/urat/v12/ ../v12/ | + | path input = /d01/urat/v12/ |
+ | **../v12/** | ||
binary data are stored in LINUX-style sequence | binary data are stored in LINUX-style sequence | ||
some computers (PC-style) need a byteflip | some computers (PC-style) need a byteflip | ||
- | byte flip (Y/N) ? N N | + | byte flip (Y/N) ? N |
- | path output= ./ ../asc/ | + | **N** |
- | first, last zone (326..900) to handle now = 326 327 326 900 | + | path output= ./ |
+ | **../asc/** | ||
+ | first, last zone (326..900) to handle now = 326 327 | ||
+ | **326 900** | ||
enter column separator character (default = blank) | enter column separator character (default = blank) | ||
begin read file = ../v12/z326 | begin read file = ../v12/z326 | ||
- | ... output to = ../ascz326.asc | + | ... 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 | Download the example project file for Skychart Catgen from http://www.ap-i.net/pub/skychart/urat/urat1.prj.zip | ||
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Then use [[en:documentation:catgen|Catgen]] to convert the text files to a binary catalog optimized for chart display. | Then use [[en:documentation:catgen|Catgen]] to convert the text files to a binary catalog optimized for chart display. | ||
cd URAT1 | cd URAT1 | ||
+ | unzip urat1.prj.zip | ||
mkdir cat | mkdir cat | ||
ulimit -S -n 20000 | ulimit -S -n 20000 |