Yebes Observatory 40-m Telescope

Due to the ongoing comissioning of new broad-band receptors in the Q and W bands, the investigation and improvement of telescope efficiency and functionality, and the implementation of new observing modes (i.e. on-the-fly maps), there will be no Call for Proposals for semester 2019 B. Instead, proposals awarded with telescope time in semester 2019 A will be observed during the second semester of the year, and the resulting data subsequently sent to the IPs. We apologise for any inconvenience this might cause.

Proposals are invited for observations with the RT40-m telescope in Yebes Observatory in the period February 1st - July 31st, 2019.
The National Geographic Institute of Spain (IGN) operates a 40-m radio telescope located in Yebes Observatory, a large-scale scientific facility (ICTS) about 50 km north-east of Madrid. The Yebes 40-m diameter millimetre-wave telescope is used for, e.g., observations of spectral line emission from molecules (in circumstellar envelopes, the interstellar medium in the Galaxy, extragalactic objects, etc), and also for astronomical and geodetic VLBI observations (through a separate proposal procedure).
Proposal submissions
FROM NOVEMBER 12th to DECEMBER 9th, 2018.
Observing period and operations
This Call for Proposals is for single-dish, spectral-only observations during the period February 1st - July 31st, 2019.
Access to the telescope is available to all qualified scientists, of any country. Observing time is assigned to applicants based on the recommendations of the IGN Yebes Program Committee (IYPC), which judges the scientific merit (and technical feasibility) of the observing proposals. Observers are NOT requested to visit Yebes to carry out their observations, which will be carried out in service mode.
Note: For the time being, all observations will be carried out in shared-risk mode. The Yebes Observatory cannot guarantee every accepted proposal will be carried out or pass the quality control assessment, although it will work on a best-effort basis to do so.
Telescope: 40-m diameter telescope. Location: Yebes, 50 km north-east of Madrid. Latitude 40° 31' 30.75" N, longitude 03° 05' 19.41" W, elevation 980 meters.
The RT40m is equipped with HEMT receivers for the 2.2-50 GHz range, and a SIS receiver for the 85-116 GHz range. However, for single-dish observations only three bands are currently offered, C-band (centered in 6.6 GHz), K-band (21-25 GHz), and Q-band (41-50 GHz). Please note that the latter two bands can be observed simultaneously. Dual (circular) polarization is available in all offered bands.
Band Frequency range Receiver temp. Receiver type Polarization HPBW (") Jy/K Tmb/Ta*
C 6.6 GHz 30 K HEMT amplifier Dual (circular pol.) 307 3.2 1.0
K 21.0 - 25.0 GHz 50 K HEMT amplifier Dual (circular pol.) 84 4.1 1.3
Q 39.5 - 50.0 GHz 50 K HEMT amplifier Dual (circular pol.) 42 4.8 1.8
The back-ends for spectral line observations consist of a Fast Fourier Transform spectrometer (FFTS). Observations in K- and Q-bands can be performed simultaneously covering an instantaneous bandwidth of 9 GHz in Q band and 2.5 GHz in K band with 38 kHz of spectral resolution. C-band observations are limited to an instantaneous bandwidth of 500 or 100 MHz (30 or 6.1 kHz of spectral resolution) centered at 6.6 GHz. Continuum back-ends are only used for pointing and focus scans, and are currently not offered for science observations.
Band Frequency range Spectrometer Bandwidth Spectral Resolution
C 6.6 GHz FFTS 1x500 MHz 500 MHz, 100 MHz 30 kHz, 6.1 kHz
K 21.0 - 25.0 GHz FFTS 1x2.5 GHz 2.5 GHz 38 kHz
Q 39.5 - 50.0 GHz FFTS 4x2.5 GHz 9 GHz 38 kHz
Thecnical developments
As part of the technical developments pushed by the ERC-Nanocosmos project (ERC-2013-Syg-610256-NANOCOSMOS), we plan to expand up to 18 GHz the instantaneous bandwidth in Q band. We expect that this improvement will be available since February 1st 2019.
Observing modes
Position switching and frequency switching modes are available. On-the-fly mapping will be offered in the near future.
Observing procedures
Observations will be performed by Yebes operators using macros/procedures defined and prepared by the observer with the help of Yebes support astronomers, who will contact observers with awarded time in advance of their observations and help them prepare appropriate macros for them. Observers are also encouraged to visit the Yebes observatory in order to better prepare their macros/procedures.
Proposal preparation and submission
RT40m uses NorthStar for preparation and submission of proposals. NorthStar is used by several radio and optical observatories.
In NorthStar, information about applicants, instruments, targets, etc., is to be provided "on-line", and the scientific and technical justification is to be prepared "off-line" and uploaded as a pdf file (also target lists can be uploaded). NorthStar then produces one pdf file with all information. NorthStar includes information on how to use it.
The proposal must contain a proper and concise scientific+technical justification including an explanation for how the requested observing time was calculated, in total no more than 2 A4 pages long, plus references, figures and tables if needed (for a total maximum of 4 pages). Any word processor able to produce pdf files is allowed for preparing the document, although LaTeX is strongly encouraged. A very simple LaTeX template is provided here for this purpose.
Proposers should mention relevant previous observation with RT40m or other telescopes, and clearly show preliminary results. Observing time estimates should be made using the on-line observing time calculator. If observations are for Ph.D. work, this should be stated.
For VLBI proposals special rules apply. For proposals which request Yebes RT40m as part of the European VLBI Network (EVN) see here. Information on proposals for the Global mm-VLBI network can be found here.
Publications based on Yebes RT40m observations should be acknowledged:
Based on observations with the 40-m radio telescope of the National Geographic Institute of Spain (IGN) at Yebes Observatory. Yebes Observatory thanks the ERC for funding support under grant ERC-2013-Syg-610256-NANOCOSMOS
Further information
  • The NorthStar proposal submission tool.
  • In case of problems with NorthStarcontact with
  • Questions about the telescope or the proposals in