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Stellar Observations Network Group

SONG is an initiative to construct a global network of 1-m class robotic telescopes.

The scientific goals of SONG are:

  • to study the internal structure and evolution of stars using asteroseismology.
  • to search for and characterize planets with masses comparable to the Earth in orbit around other stars.

Welcome to the SONG-homepage

Tenerife site, March 22nd 2012
Telescope installed, April 23rd, 2012

For images showing the progress of the first site at Tenerife check the Webcam 1 or Webcam 2 or look at this.

Latest news and announcements

Solar spectrum observed with the chinese spectrograph
Image of Saturn with improved optics (June 2013)
Christmas 2012 at the Delingha site
Sky tracker image of the Andromeda Galaxy
First stellar velocity measurements on beta Aql compared to earlier measurements (non simultaneous).
Telescope for the Delingha site at the factory in China.

Jul. 1, 2014

More and later news are under the News menu

Dec. 12, 2013:
The SONG spectroscopic observations have now started in robotic form after the optics of the telescope now seems to be good. How good we will know, when decent weather appears so that the image quality can be tested. In the beginning we will concentrate on spectroscopic programs until the final test of the optics has been carried out.

Sep. 30, 2013: While we are still waiting for the active optics to be finally adjusted, we now have a spectrum with the spectrograph built in China of the Sun. The Sodium doublet is visible (central order) as well as the Halpha line (upper left). Click on the spectrum to enlarge.

Jun. 19, 2013: The secondary mirror has been repolished and a better image quality obtained as evident in the image of Saturn shown on this page. We expect to have Factory Acceptance before the end of June.

Jan. 9, 2013: SONG Tenerife node to start operating in February after revision of optics. See Christmas card showing the 50BiN telescope at the Chinise site at Delingha. SONG node to be installed in May. The Sky tracker camera on the Tenerife node is operating now. To get an impression of the field of view look at the image of the Andromeda Galaxy.

Aug. 15, 2012: The Chinese SONG node is making good progress and expected to go into operation 2013. This is illustrated by the photo of the telescope under construction.

Aug. 12, 2012: First velocity measurements performed (see figure). Remote observing possible and robotic mode is under development.

Jul. 12, 2012: First spectra of stars recorded and analysed. At Vmag=2.48 using 90s exposures the error per data point is close to 1.3 m/s. The image quality of the telescope is not perfect due to a misunderstanding about the secondary mirror. A new mirror will be delivered in August. We are now starting remote operations of the site as a step towards a fully automatic mode. A proper figure showing the latest results will soon be presented here.

Feb. 8, 2012: SONG Tenerife site installation planned March 2012. Telescope handover date March 21st. The progress can be followed by watching the site with Webcam 1 or Webcam 2.

Nov. 7th, 2011: The SONG China Site is now accessible at a new web page SONG China.

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Revised 2014.07.09