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Workshop of MW-Gaia COST Action 18104, Working Group 3, Planetary Systems Near and Far

Scientific Organizing Committee: Prof. Karri Muinonen (chair), Dr. Anne Virkki, and Dr. Antti Penttilä

Local Organizing Committee: Dr. Antti Penttilä (chair),  Dr. Anne Virkki, Ms. Elizaveta Uvarova, Mr. Mikko Vuori, Mr. Vesa Björn, Prof. Karri Muinonen, Department of Physics, University of Helsinki

Workshop dates: September 28–29, 2021

Workshop scope

Asteroids and comets are the key to the evolution of the Solar System. These small Solar System objects (SSOs) are being systematically observed, with unprecedented precision in photometry, spectroscopy, and astrometry, by the ESA Gaia Space Mission. The workshop will cover the synergies and challenges in the combination of the Gaia data and data from other sources, that is, from ground-based astronomical observations and space missions to small SSOs. The former include astrometry, occultations, spectroscopy, polarimetry, and photometry, whereas the latter include the high-resolution observations of asteroid Ryugu by the Hayabusa2 mission (JAXA), of asteroid Bennu by the OSIRIS-REx mission (NASA), and of Comet 67P/Churyumov-Gerasimenko by the Rosetta mission (ESA). How Gaia relates to future SSO space missions, such as DART (NASA) and Hera (ESA), Comet Interceptor (ESA), and Destiny+ (JAXA), will be addressed.

The workshop improves the understanding of the physics of small SSOs to draw inferences on their origin and formation. Topics cover, for example, exploitation of the extraordinary accuracy of, first, Gaia astrometry for orbit improvement, navigation to mission targets, and asteroid mass determination, and, second, Gaia photometry for the retrieval of asteroid phase curve parameters, shapes, and rotational characteristics. Tutorial sessions are organized using pre-recorded videos on data analysis techniques in astrometry and photometry, including applications of machine learning techniques to large samples of asteroid data.

Invited speakers

The workshop attendance is by invitation only, with the restriction of maximum 25 participants on site.


The program will be composed of invited oral presentations with a duration of 20 min each, including questions and answers. Additionally, there will be specific sessions for discussion.

Detailed program to be confirmed.


The workshop is organized in hybrid mode with participants attending virtually and on site. Both modes of attendance will involve scientific presentations via Zoom. Mankeliaitta of the Krapi Conference Center (Tuusula, Finland) serves as the workshop venue, with accommodation at the Onnela premises.

Invited participants (ViZ = virtually via Zoom,  OZ = on site via Zoom)

  • Irina Belskaya (ViZ)
  • Matthew Berg (OZ)
  • Jürgen Blum (ViZ)
  • Benoit Carry (ViZ)
  • Alberto Cellino (OZ)
  • Marco Delbo (ViZ)
  • Deborah Domingue (OZ/ViZ to be confirmed)
  • Grigori Fedorets (ViZ)
  • Mikael Granvik (ViZ)
  • Maria Gritsevich (ViZ)
  • Tomas Kohout (OZ)
  • Yuna Kwon (ViZ)
  • Eric MacLennan (ViZ)
  • Johannes Markkanen (OZ)
  • Julia Martikainen (OZ)
  • Joe Masiero (ViZ)
  • Nick Moskovitz (ViZ)
  • Karri Muinonen (OZ)
  • Olga Munoz (OZ)
  • Dagmara Oszkiewicz (OZ)
  • Antti Penttilä (OZ)
  • Antoine Pommerol (ViZ)
  • Vasilij Shevchenko (ViZ)
  • Lauri Siltala (OZ)
  • Federica Spoto (ViZ)
  • Paolo Tanga (OZ)
  • Gorden Videen (OZ)
  • Anne Virkki (OZ)
  • Xiaobin Wang (ViZ)
  • Sloane Wiktorowicz (ViZ)
  • Evgenij Zubko (OZ)

To be completed.

All other participants

Virtual attendance via Zoom, to follow the presentations, will be possible for MW-Gaia participants and other interested colleagues. Note that there is likely to be an upper limit for the number of participants. Please send email to to receive the connection details.


The workshop is supported by the Gaia COST Action MW-Gaia (CA18104) and the Academy of Finland projects InSight (345115) and PlanetS (325805).

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