• Educational Activities for Students

    The educational program for children at Thissio Visitor Center

  • Doridis Telescope

    Doridis Telescope

  • WMO certificate
  • ttod_photo01
  • August

    August 2017 | Photo: Theofanis Matsopoulos


    Julius Schmidt, CHARTE DES GEBIRGE DES MONDES, 1878, ΝΟΑ Library

  • simonvouet English2

    Simon Vouet (1590 - 1649), The Muses Urania and Calliope (1634)

    National Gallery of Art, USA

  • Τηλεσκόπιο Αρίσταρχος English

    Aristarchos Telescope, Helmos Observatory

  • Helmos National Geographic English

    Helmos Observatory, Photography: Harry Katzjaeger
    Source: "Top Shots," National Geographic, June 2012

  • Eskimo Nebula NGC2392 English

    Eskimo Nebula (NGC2392), Aristarchos Telescope, Observer: Dr. Ioannis Alikakos (NOA)

    Digital Image Processing: Theofanis Matsopoulos.

  • Μουσείο Γεωαστροφυσικής English

    Geoastrophysics Museum, Thissio

  • Εκπαίδευση στο ΕΑΑ English

    Summer School in Astrophysics

  • Τηλεπισκόπηση-Γή English

    Remote Sensing & Earth Observation

  • Greece from ISS English

    Greece from the International Space Station

    Photography: Paolo Nespoli, ESA astronaut

  • 3D Sun English

    3D Image of the Sun from the Solar Dynamics Observatory (SDO) mission of NASA.

    Source: NASA's Solar Dynamics Observatory

  • Helicorder English

    Analogue seismograph recorder

  • Geothermal English
  • Παλιρροιογραφος English

    Tide-gauge of the Instittute of Geodynamics at Vlyhada, Santorini.

  • Πειραμα Ulusses English
    Recovered  Ocean Bottom Seismometers on board of research vessel in the frame of the ULYSSES scientific program
  • Meteo historic archive english

    The historic archive of NOA/IERSD with recordings of climatic observations dated from the mid-19th century is one of the oldesr sources of climatic information for Eastern Medirranean.

  • Meteo time-series graph English

    The evolution of the average annual temperature in Athens from the mid-19th century until today, according to the records of the historic station NOA/IERSD (Hill Nymphs Thission).

  • Researchers Night 2014

    Pnyx Hill: Citizens observe the night sky through telescopes of NOA

    Researchers Night 2014

  • Researchers Night 2014

    Pnyx Hill: Citizens observe the night sky through telescopes of NOA

    Researchers Night 2014




“Hubble Catalogue of Variables (HCV)”

Funding Organization

European Space Agency (ESA)

NOA role


Scientist in charge

Kanaris Tsinganos

Start Date


End Date


Project Website

Number of Personnel under NOA contracts



The “Hubble Catalogue of Variables” or HCV is a new activity of the European Space Agency (ESA) launched at the National Observatory of Athens (NOA). The program, which was kicked-off in April 2015, aims to identify all the variable and transient sources in the Hubble Source Catalog (HSC; http://archive.stsci.edu/hst/hsc/), which has combined the tens of thousands of visit-based source lists in the Hubble Legacy Archive (HLA; http://hla.stsci.edu/) into a single master catalog. The HSC was designed to optimize science from the Hubble Space Telescope (HST) and the HCV will take this a step further, by extending the original HSC services and implementing added-value functionality. The HCV system will consist of three modules or elements. One module is a highly-automated data-processing pipeline for querying the HSC, detecting and validating the variable sources, and populating the catalogue of variables. The second element is the HCV itself. The third module is a web-based, user-friendly interface that will make the HCV accessible to the public.

The novelty of this activity is expected to be the improved efficiency in identifying variables and its enormous coverage due to HST’s archive of imagery from the 25 years of HST observations. HST’s extremely long baseline of observations is totally unprecedented for any space mission. Given the combination of high angular resolution and depth of the HST data, the HCV has the potential to produce groundbreaking science despite the non-uniformity of the data and the limitations of the HSC. The time domain and variability properties of astronomical sources provide a wealth of information that can be very useful for characterizing e.g. the fundamental properties of stars, or for identifying particular types of sources from a large dataset. Objects showing variations in flux may be associated with variable stars in our own Galaxy, stars in nearby galaxies, or distant Active Galactic Nuclei (AGN), or possibly transient events such as novae and supernovae.

Mon Tue Wed Thu Fri Sat Sun

Penteli Visitor Center
Thissio Visitor Center
Educational program on Meteorology
Multiple Events

Real Time Seismicity

Institute of Geodynamics
seismografoi thumb

Weather Forecast


View the latest weather forecasts, maps, and alerts for Greece on meteo.gr


The Sky Today


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