ALMA Solar Ephemeris Generator
Notice to users
Solar Dynamics Observatory (SDO) sometimes has an on-orbit tests. During tests the roll angle of SDO vary from 0 to 180 degrees. Near-realtime images from SDO may appear with the incorrect position angle, similar to what happens during instrument calibration.
It is possible that ALMA Solar Ephemeris GUI interface doesn't work as expected with SDO/AIA images during that period, so please use it with caution and double-check your coordinates with other tools (e.g.
Helioviewer or SolarMonitor). However, the text interface should not be affected by this issue.
Select user interface
GUI (by clicking on the solar image)
Text (manual input of coordinates)
Input FITS file
AIA image (local)
AIA synoptic 94 (latest)
AIA synoptic 131 (latest)
AIA synoptic 171 (latest)
AIA synoptic 193 (latest)
AIA synoptic 211 (latest)
AIA synoptic 304 (latest)
AIA synoptic 335 (latest)
AIA synoptic 1600 (latest)
AIA synoptic 1700 (latest)
AIA synoptic 4500 (latest)
AIA image (for testing)
Size: - x -
Format: - View header
> of 0.
Show ALMA 12m beam size
cursor (wcs) = (-, -), intensity = -
Estimated min. no. of pointings for ALMA 12m array is 1 (single pointing).
Use old JPL header ("R.A._(ICRF/J2000.0)_DEC")
Original JPL file
Download table data
Please read the
User Manual. Notes
Coordinates of the Sun are astrometric J2000 coordinates from JPL Horizons for the ALMA center of array. Atmospheric refraction is not taken into account.
Physical ephemeris of the Sun are also from JPL Horizons.
If you use this tool in research or observation planning, please acknowledge it by citing the following paper:
Skokić, I.; Brajša, R. (2019) ALMA Solar Ephemeris Generator. Mining-geological-petroleum engineering bulletin, Vol. 34 No. 2, 59-65.
DOI: 10.17794/rgn.2019.2.7, NASA ADS
You are using this software at your own risk. The author(s) do not take responsibility for any damage caused by this software.
The software is provided "As is", without warranty of any kind, express or implied, including but not limited to the warranties of merchantability,
fitness for a particular purpose and noninfringement. In no event shall the authors or copyright holders be liable for any claim, damages or other liability,
whether in an action of contract, tort or otherwise, arising from, out of or in connection with the software or the use or other dealings in the software.
http://www.eso.org Czech ARC node Ondřejov,
http://www.asu.cas.cz/alma AIA synoptic images courtesy of NASA/SDO and the AIA, EVE, and HMI science teams.
https://github.com/astrojs/fitsjs JPL Horizons,
http://ssd.jpl.nasa.gov/horizons.cgi Joint Science Operations Center (JSOC),
http://jsoc.stanford.edu Hvar Observatory,
http://oh.geof.unizg.hr Kanzelhöhe Observatory,
Special thanks to the members of the ALMA Solar Development Team for comments, improvement suggestions and testing.
Brajša, R.; Vršnak, B.; Ruždjak, V.; Schroll, A.; Pohjolainen, S. (1991) Solar differential rotation determined by polar crown filaments. SoPh, 133, p. 195-203.(
ADS) Sudar, D.; Skokić, I.; Ruždjak, D.; Brajša, R.; Wöhl, H. (2014) Tracing sunspot groups to determine angular momentum transfer on the Sun. MNRAS, 439-3, p. 2377-2385.(
ADS) Thompson, W. T. (2006) Coordinate systems for solar image data. A&A, 449-2, p. 791-803.(
ADS) Wöhl, H.; Brajša, R.; Hanslmeier, A.; Gissot, S. F. (2010) A precise measurement of the solar differential rotation by tracing small bright coronal structures in SOHO-EIT images. Results and comparisons for the period 1998-2006. A&A, 520-A29.(
Hvar Observatory, Faculty of Geodesy, University of Zagreb Kačićeva 26, HR-10000 Zagreb, Croatia
Astronomical Institute of the Czech Academy of Sciences Fričova 298, 251 65 Ondřejov, Czech Republic