Application for Observing Time
at the Calar Alto Telescopes
- General Information -
Spanish open time at the CAHA 2.2- and 3.5-m
Applications for observing time at the 2.2- and 3.5-m
telescopes for the Spring semester 2021
(January 1 through June 30)
The Principal Investigator (PI) of the proposal must be
affiliated with a Spanish Institution at the time of
submission. Co-investigators (CoIs) from all countries are welcome to participate along with the Spanish PI.
As an ICTS (Spanish Singular Scientific Facility), Calar Alto offers
a minimum of 20% of the available observing time. Due to the new
status of the observatory, the number of available observing
nights for the Spanish community is larger since 2019. For
this reason, Calar Alto encourages Spanish PIs to send their
proposals and take advantage of the new situation.
UPDATED INFORMATION IS AVAILABLE IN THE CALL FOR PROPOSALS (pdf).
DEADLINE FOR SPRING 2021 PROPOSALS
October 15, 2020 23:59:59 (CEST)
Earliest date for submission is September 17, 2020
Calar Alto also offers the option to buy observing time at the
3.5-m and 2.2-m telescopes.
Interested PIs must submit a proposal following the regular Call for Proposals procedure.
Those pay-per-night proposals approved by the TAC will be accepted.
In these cases, a separate operation agreement (MoU) between CAHA A.I.E. and the
respective user institution shall be signed.
Proposals submitted out of the regular period indicated in the regular Call for Proposals will also be considered and evaluated by the TAC, but their priority will be conditioned by the availability of the schedule of the semester. For further information please contact the CAHA director (director at caha.es).
For any use of the 1.23-m telescope, a separate operation agreement
between CAHA A.I.E. and the respective user institution will be
There is no definite deadline for this telescope, but a scientific proposal
must be submitted to the CAHA director (director at caha.es), and it will be evaluated all year
long by an external TAC.
Only the best rated proposals for the 1.23 m will receive time on this
Since the 1.23-m telescope with the
can be used remotely, experienced observers are welcome to use it from the
distance. Yet, for new users, we strongly recommend that the first run is
performed in visitor mode for several nights, to gain sufficient experience
at the telescope. Limited support will be available (day and night, on a best
effort basis) for remote users, considering that larger CAHA telescopes have
a higher priority.
The Schmidt telescope (80-cm aperture, 1.2-m mirror) is currently under
contract with the European Spatial Agency (ESA), with well-trained observers
using it fully remotely, in an automated way, with Python scripts. The only
instrument mounted is a 2k CCD (model FLI ProLine 23042, offering a field of
view 44'x44' ), property of Deimos Space S.L.U., to do free band imaging.
A filter wheel has just been installed to perform multi-band imaging
CAHA-BASED PUBLICATIONS MUST CONTAIN A FOOTNOTE AS FOLLOWS:
"Based on observations collected at the Centro Astronómico
(CAHA) at Calar Alto, operated jointly by Junta de Andalucía
and Consejo Superior de Investigaciones Científicas (IAA-CSIC)."
Alternatively, a similar phrasing appearing in the paper acknowledgements is acceptable.
Failure to do so may result in penalties being applied by the TAC for future proposal submission from the same PI/Co-I(s).
If you would like to get an email reminder in the future to inform
you about the start of the next proposal round, send an email to
notice"at"caha.es with the subject line "CfP subscribe". In the same
way you can unsubscribe from this list with the subject line "CfP
Please note that a new proposal submission (web-based) system should
available for the Autumn 2021 semester. We'll inform in advance former
users by email, and potential new ones through our News web page on
Please stay tuned!
Last updated: September 16, 2020