ALMA Solar Ephemeris Generator

Important notice to users

Solar Dynamics Observatory (SDO) will have an on-orbit test, March 28–April 25, 2018. During the test the roll angle of SDO will vary from 0 to 180 degrees. Near-realtime images from SDO may appear with the incorrect position angle, similar to what happens during an instrument calibration. (link)

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
Date: - Size: - x - Format: -
Scaling function: Color: Frame of 0.
Show grid
Show ALMA 12m beam size in band:

cursor (wcs) = (-, -), intensity = -
Pixel (x, y)
Helioprojective (x, y) arcsec
Heliographic (CMD, B) degrees
Heliographic (L, B) degrees

Mosaic observation
Width: arcsec
Height: arcsec
Angle: degrees
Estimated min. no. of pointings for ALMA 12m array is 1 (single pointing).
Change default location (ALMA)
Lat. (N): Lon. (E): Alt.: m
Start of observation (UT):
End of observation (UT):
Step size (minutes):
Differential rotation profile:
A: B: C: deg/day
Height above photosphere (km):

Status window: