The most important advantage of widefield cameras is, precisely, the "widefield", since this offers the observers the possibility of obtaining vast amounts of data in a much shorter observing time. However, for a reliable data interpretation, it is necessary a proper data calibration. Concerning the flatfielding of images, many times it is required to obtain several integrations in blank regions (sky patches without bright sources) nearby to the science target areas.

TESELA is a service developed to provide access to a catalogue of blank regions, based on the application of the Delaunay triangulation of the sky. The present implementation of TESELA uses as source for the star coordinates the Tycho-2 Catalogue (Hog et al. 2000), or the USNO_B Catalgue (Moret et al. 2003).

  Search Form for Tycho-2 Blank Fields (6-11 mag)

  Search Form for USNO-B Deep Blank Fields (15-18 mag)

  Short list of selected deep blank fields at the northern and southern hemisphere
     - Deep Blank Field catalogue for medium- and large-size telecopes (Jiménez-Esteban et al. 2012)
     - TESELA: a new Virtual Observatory tool to determine blank fields for astronomical observations (Cardiel et al. 2011)
     - Searching for good blank regions in the sky for flatfielding (Cardiel & Aberasturi, 2008)
     - The Tycho-2 catalogue of the 2.5 million brightest stars(Hog et al. 2000)
     - The USNO-B Catalog (Monet et al. 2003)
  Help Desk
  Private zone
The system has been jointly developed by the Department of Astrophysics of the Universidad Complutense de Madrid and CAB (INTA-CSIC) and is maintained at CAB (INTA-CSIC).

Acknowledging TESELA in publications:
Please include the following in any published material that makes use of TESELA:
"This publication makes use of TESELA, partially funded by the Spanish MICINN under the Consolider-Ingenio 2010 Program grant CSD2006-00070: First Science with the GTC, and developed under the Spanish Virtual Observatory project supported from the Spanish MICINN through grants AyA2008-02156, AyA2011-24052."

Referencing TESELA in publications:
If your research benefits from the use of TESELA, please include the following reference in your publication:
Tycho-2 BFs: "Cardiel, N., Jiménez-Esteban, F.M., Alacid, J.M., Solano, E., & Aberasturi, M. 2011, MNRAS, 417, 3061"
USNO-B DBFs: "Jiménez-Esteban, F.M., Cabrera-Lavers, A., Cardiel, N. & Alacid, J.M. 2012, MNRAS, 427, 679"

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