TESS photometers

If you want to purchase our products, please contact us at: jzamorano@fis.ucm.es
Open data and real time graphs available at tess.dashboards.stars4all.eu
TESS-W  is the photometer you need to continously monitoring the sky brightness at night
TESS-P has been designed to use as a hand help portable photometer
  • The small display shows the measurements.
  • The photometer can be connected via bluetooth to the smartphone app to display and to record your observations.
  • There are accelerometers included to provide the pointing of the photometer.
  • The inside battery is enough to register sporadic measures.
  • If you want to use it on the go or for a night long series of observations you should connect to a power bank.
  • Download and install TESS-P app for Android and record your measurements along with your GPS location.
  • You can also use this photometer to map the sky brightness from a moving vehicle.
TAS allows you to obtain all-sky brightness maps
  • The mount should be leveled and oriented to north.
  • After connecting to the TESS-P smartphone app you only need to press the small button to initiate the full automatic scanning.
  • The 140 data point all along the celestial vault are recorded and they are used to create a map.
  • The all-sky night sky brighness map is similar to those of the NixNox Project.
  • Optional watertight case for outdoor and transport protection


There is some literature about TESS-W photometer.  The device has been presented in different international meetings.
The data is scientifically accurate and it has already been used for research on light pollution.
Follow the link to browse all publications:


The TESS team

Meet the group of professionals that design, build and distribute TESS photometers.

Astrophysics Professor
Jaime Zamorano jzamorano@fis.ucm.es

Professional astronomer and Astrophysics professor at Universidad Complutense de Madrid (UCM).

Rafael González rafael08@ucm.es

Telecom Engineer & former DevOps expert at Telefonica R&D

Cristobal García cristogg@yahoo.es

Telecom Engineer & amateur astronomer

Lucía García lucia_garcia@ucm.es

Research assistant at Universidad Complutense de Madrid (UCM). TESS webpage designer & webmaster.

PhD. Astrophysics & Engineer
Sergio Pascual sergiopr@fis.ucm.es

Astrophysics and software Engineer, assistant professor at Universidad Complutense de Madrid (UCM).

Computer Engineer
Esteban González egonzalez@fi.upm.es

Research assistant at the Ontology Engineering Group at Universidad Politécnica de Madrid (UPM).

Optical Engineer
Carlos Tapia Ayuga ceta@ucm.es

Optical Engineer at Escribano Mechanical & Engineering.

Sales manager
Pamela Cepeda pamelacepeda@gmail.com

Sales and customer management