You are here: Home / Observations / Content / Sun observations / or Michelson experiment

Sun observations / or Michelson experiment

To observe the Sun with Telesto it is mandatory to put a cap and a filter to prevent the detector's damage (the sun is too bright to observe it without protection).
Follow these steps:

1) In the control room, take the Sun filter. This filter let about 1/10000 of the light to pass through it (in all wavelengths).

2) In the dome, place the sun filter in the white cap

3) Use the ladder to help you to remove the cover from the telescope

3a) Remove the 4 butterfly screws from the telescope front

6) Install the white cap and secure it with the butterfly screws

7) Place the ladder back close to the wall, where it was

8) Follow the STARTUP procedure of the Telesto user manual.

9) In the OBSERVATIONS section, choose a target using Stellarium (search for 'Sun' in Stellarium, pp. 18-19 of the manual)

10) As suggested in the manual, point to the Sun with ‘Slew’ (p. 21 of the manual)

11) Take a picture of the Sun (e.g., 0.3-second exposure with the V filter). If the Sun is not centered in the image, slightly adjust the pointing coordinates (Framing tab → Coordinates) as described in the manual (p. 19).

12) Adjust the coordinates, slew, and take another picture until the Sun is well centered in the image


The apertures in the mask can be also used to do other scientific experiments.
One is used to install a Mylar filter and can be used for example for the Michelson experiment. In the latter case a ring and spring can be used to secure the mask.
The other aperture with threads make it possible to install a Coronado Fabry-Perot. This is mechanically working but has not yet been validated on sky.