Observing at the VTT

View of ChroTel from the 2nd floor of the VTT right after a blizzard in Feb. 2014

Observing Season:

The VTT observing season typically starts in April and ends at the beginning of November (for obvious reasons - see picture). Application deadlines are mid-January and May/June. 


Due to changes in setup and instrumentation, the observing season 2019 will be split into two halves: April 28 - beginning of August and from mid August - end of November, 2019. 


VTT/GREGOR – Call for Observing Proposals 2019B (Aug 12 – Nov 30)

We invite proposals for observing campaigns at VTT and/or GREGOR in 2019B, with a submission deadline of June 2, 2019, 23 UT.


Instrumentation available for the second season is:


•    The chromospheric or standard grating for spectroscopy in up to 3 spectral regions simultaneously
•    Own instrument setups

The VTT grating will be exchanged in Sep/Oct if requested by the submitted proposals.

Consortium members who wish to use LARS should contact R. Schlichenmaier, T. Kentischer, and L. Kleint before proposal submission to discuss options.

Requests for technical time should be accompanied by a daily schedule of the planned work.


Apply for observing time:

The VTT is open to external users. The observing time at the VTT has various quotas. All user groups are invited to apply for observing campaigns via one of the following TACs.


Spanish time (CAT Solar)

Contact Solar Cat at IAC for more information.

German time (split between the AIPMPS, and KIS)

Contact tac@leibniz-kis.de for more information.


In 2019B, 10 days are available at VTT. Send proposals to east-tac@astro.su.se.


A common observing time allocation process for European Solar Telescopes was one of the achievements of the trans-national ACCESS program of OPTICON (FP7). This European Time Allocation Committee was established by EAST. The EAST TAC provides a common standard of review for all observing proposals. Observing time quotas for all European telescopes and instruments can be allocated by the EAST TAC. The EAST TAC allocates SOLARNET ACCESS time and CCI international time. SOLARNET is the solar successor of OPTICON, and started in April 2013. Main objectives are to provide access to European Solar telescopes and instruments, and to develop data pipelines such that science-ready data is easily available for users of the ACCESS program. For the VTT observing campaigns with a typical length of 10 days are allocated. For SOLARNET campaigns, travel grants are also provided.


Observing Proposals

External and new users are explicitly encouraged to apply for observing time through one of the above programs. Please contact  Thomas Kentischer (tk@kis) if you are interested in observing at the VTT or if you need help. 

Proposal forms 2019 are available in the right column.

Deadlines for applications to the 2019 observing season are: