VLBI Session at URSI GASS 2021

Published on 27 July 2021

On 1 September 2021, the Session "Very Long Baseline Interferometry" will highlight the relevance of VLBI in the fields of astrophysics, Earth and planetary sciences. The session is co-organised by JIVE as part of the XXXIV General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS 2021) that will be held in Rome (Italy) from 28 August to 4 September 2021.

Very Long Baseline radio Interferometry (VLBI) is a mature technique, whose applications in astronomy, geodesy and planetary sciences are unique now that the need for milliarcsecond angular resolution and for extremely accurate localisation are the ultimate frontiers for some of the hottest scientific areas. For this reason, VLBI is in the heart of some of the most advanced present and future instruments and developments (EHT, ngVLA, SKA, VGOS). The session J04 Very Long Baseline Interferometry (see detailed programme below) will bring together experts in each field of application, to provide a view of the state-of-the-art and the desired developments, and to assess the central relevance of VLBI in the continuously evolving landscape of astrophysics, Earth and planetary sciences.


The session co-organised by JIVE is part of the programme of URSI's Commission J Radio Astronomy comprising 18 sessions, see full programme here.


URSI GASS 2021 will be held as an hybrid event, on-site at Sapienza Faculty of Engineering, with provision for online participation and presentations. Valued contributions from online participants will be integrated into the sessions with further details to follow.


The GASS of URSI are held at intervals of three years to review current research trends, present new discoveries and make plans for the future research and special projects in all areas of radio science. The URSI GASS 2020 edition was postponed due to the COVID-19 outbreak.


Programme Session J04: Very Long Baseline Interferometry (VLBI)


Part 1: 1 September 09:00 - 10:00 CEST


(Invited) Imaging Supermassive Black Holes and Blazar Jets with Millimeter and Space VLBI Observations - Gómez, Jose L. (1)

(1) Instituto de Astrofisica de Andalucia - CSIC (Spain)


VLBI Observations of the Faint (μJy) Extragalactic Radio Sources- The wide-Field VLBA & EVN GOODS-N and SPARCS-N 1.4 GHz Surveys - Njeri, Ann (1); Radcliffe, Jack (2); Beswick, Robert (1); Deane, Roger (2); Thomson, Alasdair (1)

(1) University of Manchester (United Kingdom); (2) University of Pretoria (South Africa)


Geometry transition as a common effect in nearby AGN jets - Kovalev, Yuri (1)

(1) Lebedev Physical Institute (Russian Federation)


Part 2: 1 September 10:10 - 11:10 CEST


VLBI as a key to neutrino production in blazars - Plavin, Alexander (1); Kovalev, Yuri (2); Kovalev, Yuri a. (2); Troitsky, Sergey (3)

(1) Astro Space Center of Lebedev Physical Institute (Russian Federation); (2) Lebedev Physical Institute (Russian Federation); (3) Institute of Nuclear Research (Russian Federation)


Astrophysical masers: What can VLBI do for you? - Colomer, Francisco (1)

(1) Joint Institute for VLBI ERIC (The Netherlands)


(Invited) An updated view of the Milky Way from the BeSSeL programme - Rygl, Kazi (1); Reid, Mark (2); Menten, Karl (3); Brunthaler, Andreas (3); Zheng, Xing-Wu (4); Dame, Thomas (2); Xu, Ye (5); Li, Jingjing (5); Sakai, Nobuyuki (6); Wu, Yuanwei (7)(8); Immer, Katharina (9); Zhang, Bo (10); Sanna, Alberto (1)(3); Moscadelli, Luca (11); Bartkiewicz, Anna (12); Hu, Bo (5); Quiroga-Nuñez, Luis (9)(13); van Langevelde, Huib (9)(13)

(1) Italian ALMA Regional Centre, INAF-Istituto di Radioastronomia (Italy); (2) Center for Astrophysics - Harvard & Smithsonian (USA); (3) Max-Planck-Institut für Radioastronomie (Germany); (4) Department of Astronomy, Nanjing University (China); (5) Purple Mountain Observatory, Chinese Academy of Sciences (China); (6) Korea Astronomy & Space Science Institute (Republic of Korea); (7) National Time Service Center, Key Laboratory of Precise Positioning and Timing Technology, Chinese Academy of Sciences (China); (8) National Astronomical Observatory of Japan (Japan); (9) Joint Institute for VLBI ERIC (the Netherlands; (10) Shanghai Astronomical Observatory (China); (11) Arcetri Observatory (Italy); (12) Centre for Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University (Poland); (13) Leiden Observatory/Leiden University (The Netherlands)


Part 3: 1 September 13:50 - 14:50 CEST


Imaging ~3500 Sources in the International Celestial Reference Frame - Hunt, Lucas (1); Johnson, Megan (1); Cigan, Phillip (1); Spitzak, John (2); Gordon, David (1)

(1) United States Naval Observatory (USA); (2) Computational Physics Inc (USA)


Prospective VLBI Astrometric Study of FAST - Zhang, Haiyan (1); Chen, Rurong (1)

(1) National Astronomical Observatories of CAS (China)


Will the next generation of VLBI instruments allow for an order of magnitude improvement in Astrometry? - Rioja, Maria (1); Dodson, Richard (2)

(1) ICRAR/CASS/OAN (Australia); (2) ICRAR (Australia)


Part 4: 1 September 16:20 - 17:20 CEST


The ngVLA Long Baseline Array - Brisken, Walter (1); Beasley, Anthony (1)

(1) National Radio Astronomy Observatory (USA)


VLBI with the Square Kilometre Array - Garcia Miro, Cristina (1); Paragi, Zsolt (1); Chrysostomou, Antonio (2); Colomer, Francisco (1); Breen, Shari (2)

(1) Joint Institute for VLBI ERIC (The Netherlands); (2) SKA Organisation (United Kingdom)


The current performance of the VLBI Global Observing System and comparison with legacy geodetic VLBI - Nilsson, Tobias (1); Diamantidis, Periklis (2); Haas, Rüdiger (2); Varenius, Eskil (2)

(1) Lantmäteriet (Sweden); (2) Chalmers University of Technology (Sweden)


Part 5: 1 September 17:30 - 18:30 CEST


(Invited) Near-field VLBI for space and planetary science - Bocanegra Bahamon, Tatiana (1); Cimo, Giuseppe (2); Dirkx, Dominic (3); Duev, Dmitry (4); Gurvits, Leonid (2); Calvés, Guifré (5); Pogrebenko, Sergei (6)

(1) Jet Propulsion Laboratory (USA); (2) JIVE (The Netherlands); (3) TUDelft (The Netherlands); (4) California Institute of Technology (USA); (5) University of Tasmania (Australia); (6) Joint Institute for VLBI-European Research Infrastructure Consortium (The Netherlands)


Simultaneous X- and K-Band Receiver for Astrometry and Navigation - Soriano, Melissa (1); Kooi, Jacob (2); Bowen, James (2); Fung, Andy (2); Hoppe, Daniel (2); Manthena, Raju (2); Abdulla, Zubair (2); Samoska, Lorene (3); Jacobs, Christopher (2); Lazio, Joseph (2)

(1) NASA Jet Propulsion Laboratory, California Institute of Technology (USA); (2) Jet Propulsion Laboratory (USA); (3) self (USA)


COMPASS: VLBI Beacons In Support of Lunar Science and Exploration - Eubanks, T. M. (1)

(1) Space Initiatives Inc (USA)

Session J04: Very Long Baseline Interferometry Conveners

  • Francisco Colomer (JIVE, the Netherlands)
  • Taehyun Jung (KASI, Republic of Korea)
  • Chris Jacobs (Jet Propulsion Laboratory, Caltech, USA)
  • Tiziana Venturi (IRA-INAF, Italy)



Francisco Colomer

JIVE Director



Jorge Rivero González

JIVE Science Communications Officer