News & Events

G3P project at AIUB successfully completed

March 15, 2023
After three years, the Global Gravity-based Groundwater Product (G3P) project has successfully ended with the publication of the global Groundwater Storage Anomaly (GWSA) maps developed by the project team. The Astronomical Institute of the University of Bern (AIUB) led work package 2 of the G3P project, which aimed at providing global maps of the "Terrestrial Water Storage" (TWS). The G3P project was funded by the EU Horizon 2020 grant program on "Copernicus evolution - Research activities in support of cross-cutting applications between Copernicus services" under grant no. 870353.

Prof. Dr. Adrian Jäggi new Chair of the SGC

January 2, 2023
Since January 2023, Prof. Dr. Adrian Jäggi, Director of the Astronomical Institute of the University of Bern (AIUB), is the new Chairman of the Swiss Geodetic Commission (SGC, https://www.sgc.ethz.ch/index.html), a commission of the Swiss Academy of Sciences (SCNAT, https://scnat.ch/). He replaces the previous president of the SGC, Prof. Dr. Markus Rothacher. Adrian Jäggi thus joins a long tradition of close relations between AIUB and the SGC.

Double Anniversary: 100 Years Astronomical Institute - 200 Years Uraniae

In November 2022, the Astronomical Institute of the University of Bern (AIUB) celebrated a double anniversary: 200 years Uraniae and 100 years Astronomical Institute. On Friday, November 25 and Saturday, November 26, 2022, the double anniversary was celebrated with a ceremony, a scientific symposium, and exciting ctivities for the general public at the University of Bern. In addition, a commemorative publication (Festschrift) is available.

New GCOS implementation plan 2022

The Global Climate Observing System (GCOS) published the new GCOS implementation plan 2022. For the first time it includes Terrestrial Water Storage (TWS) as a new Essential Climate Variable (ECV). Total terrestrial water storage (TWS) comprises all the water storage on the Earth’s continental areas in frozen and liquid state. Satellite observations of the Earth's time-variable gravity field such as from GRACE (2002-2017) and GRACE Follow-On (launched in 2018) provide global-scale information on mass changes on and below the Earth surface. Gravity data thus provide the basis to observe the new ECV.

New research group at AIUB

9. August 2022:
In July 2022, a new research group was established at the Astronomical Institute of the University of Bern (AIUB). Prof. Dr. Lucia Kleint leads the space weather group, formerly located at the University of Geneva. As the vice-director of the Zimmerwald observatory, Prof. Kleint leads its daily operations with the goal of determining orbits of various satellites and investigating space debris.

11. Copernicus POD QWG Meeting in Bern

8. August 2022:
On June 21-23, 2022, the 11th meeting of the Copernicus Precise Orbit Determination Quality Working Group took place at the University of Bern. Copernicus, the European Union's Earth observation program, is based on satellite measurements of the Sentinel fleet and other satellite missions. The purpose of the Quality Working Group is to ensure a high quality of the computed satellite orbits and to continuously improve them.

Meeting of the COST-G Consortium

11. July 2022:
COST-G stands for „Combination Service for Time-Variable Gravity Fields” and is part of the „International Gravity Field Service” (IGFS) of the „International Association of Geodesy” (IAG). Representatives of the COST-G team met on July 4 – 7, 2022 under the lead of the Astronomical Institute of the University of Bern at the „International Space Science Institute“ (ISSI) in Bern to discuss current developments.

Rolf Dach new Vice-Chair of the IGS GB

05. July 2022
In the frame of the first virtual workshop of the International GNSS Service (IGS) Rolf Dach was elected Vice-Chair of the IGS Governing Board (GB). The GB is that panel which advises and defines the strategic orientation of the IGS. As Vice-Chair he will collaborate together with the current chair Felix Perosanz (CNES) and with Allison Craddock (chair of the Central Bureau) and thus will be able to actively form the further development of the IGS. Thereby the Astronomical Institute of the University of Bern (AIUB) is taking an important position in the IGS again.

SLR through a Slit!

29. June 2022:
On June 24, after more than 4 years of preparatory work and 4 months of construction work, the satellite laser ranging (SLR) system at the Swiss Optical Ground Station and Geodynamics Observatory Zimmerwald was equipped with a new dome. In future the laser will pass through the slit of this new dome on its journey towards satellites and back. The new dome shall reduce the thermal load on the telescope during daytime operation and thus increase the yield substantially.

Meeting of the CODE Consortium

6. april 2022:
CODE stands for „Center for Orbit Determination in Europe“ and is a Joint Venture between the Astronomical Institute of the University of Bern (AIUB), Switzerland, Federal Office of Topography swisstopo, Wabern, Switzerland, Federal Office of Cartography and Geodesy (BKG), Frankfurt am Main, Germany, and the Engineering Institute for Astronomical and Physical Geodesy at the Technical University of Munich (IAPG, TUM), Germany. The four institutions are working together in different fields of satellite geodesy. Most prominent is the performance as Analysis Center of the International GNSS Service (IGS, GNSS stands for Global Navigation Satellite System). Representatives of the CODE consortium met each other on Thursday, April 5, 2022, at the University of Bern, in order to exchange about current developments and to coordinate the planning of the common future. For almost all of the participants it was the first business trip since the last meeting on March 11, 2020, in Munich.

Tour de l’IGS with Stop at AIUB

The International GNSS Service (IGS) has started in irregular order to organize virtual mini workshops on dedicated topics under the title «Tour de l’IGS». Collaborators of the Astronomical Institute of the University of Bern (AIUB) and of the CODE (Center for Orbit Determination in Europe) Consortium were significantly involved in the organization. On February 17, 2022, one of these mini workshops took place which was organized by Prof. Dr. Rolf Dach and Dr. Arturo Villiger from AIUB.

GGOS and AIUB

2. February 2022:
GGOS, the Global Geodetic Observing System, is a collaborative contribution of the global geodesy community to the observation and monitoring of the Earth System. Learn more about GGOS (https://ggos.org) and the broad variety of geodetic observations, products and services as well as the multifaceted world of geodesy and its ever-increasing benefits to science and society by clicking the link and watching the short film "Discover GGOS", to which also the AIUB contributed.

COST-G gravity field predictions for operational satellite orbit determination

10. December 2021:
Precise orbit determination (POD) of Earth observation satellites at orbit altitudes below 2000 km, so-called Low Earth Orbiters (LEOs), critically depends on the precise knowledge of the Earth’s gravity field and its variations with time. On a global scale, the time-variable gravity field is determined by the analysis of observations of the two satellites of the dedicated GRACE-FO mission (or its predecessor GRACE). In the frame of the Combination Service for Time-variable Gravity fields (COST-G) the Astronomical Institute of the University of Bern (AIUB) collects the monthly gravity field solutions of the GRACE / GRACE-FO analysis centers worldwide and derives combined solutions.

The Future is Now

15. November 2021:
Under this motto, on Friday, 05. November 2021, the day of sustainability of the three Bernese Universities took place at the vonRoll building. There were talks, workshops, and interactive information desks, where different contributions were presented by the groups of the University of Bern, the University of Applied Sciences, and the College of Education of Bern. The goal was the exchange of ideas and research works devoted to the topic “sustainability”. The Astronomical Institute of the University of Bern (AIUB) was also present with an own information desk.

AIUB in the scientific advisory board of the ITP-DLR

18. October 2021:
At the beginning of October Prof. Dr. Thomas Schildknecht of the Astronomical Institute University of Bern (AIUB) and Director of the Swiss Optical Ground Station and Geophysical Observatory was elected as member of the scientific advisory board of the Institute of Technical Physics (ITP) of the Deutsches Zentrum für Luft- und Raumfahrt (DLR). Situated at Stuttgart and Lampoldshausen, the research of this institute is focused on laser-based systems for aeronautics and space flight. It is expected that his expertise in the detection, positioning, and characterization of orbital objects as well as in the reduction of space debris by laser-based techniques will provide useful suggestions for the current and future orientation of the ITP-DLR.

BeiDou-3 Data in MGEX solution

20. September 2021:
The Bernese GNSS Software developed and maintained at the Astronomical Institute of the University of Bern (AIUB) has been enabled to support the Chinese GNSS (Global Navigation Satellite System) BeiDou 3 since spring 2021. Thanks to this update the multi-GNSS solution (MGEX) provided by the AIUB-located CODE (Center for Orbit Determination in Europe) as a contribution to the IGS (International GNSS Service) is now supporting the four operational GNSSes GPS (USA), GLONASS (Russia), Galileo (Europe), BeiDou 3 (China) along with the RNSSes (Regional Navigation Satellite Systems) QZSS (Japan) and BeiDou 2 (China). CODE's MGEX solution is, thus, offering free access to precise orbits, clock corrections, and signal calibration data of some 115 active navigation satellites to scientific, adminstrative, and commercial high-precision GNSS users.

Start of AIUB/ISSI and ISSI-Beijing Collaboration

25. August 2021:
On August 24/25, 2021, the ISSI and ISSI-Beijing International Team led by Prof. Wei Feng from the Institute of Geodesy and Geophysics of the Chinese Academy of Sciences and Prof. Adrian Jäggi from the Astronomical Institute of the University of Bern (AIUB) had its first meeting. The team supported by ISSI and ISSI-Beijng is a direct outcome of the round table COST-G Sino-European Meeting that was taking place 16.-17. January 2020 in Bern. The aim of the team members is to join their effort for gravity field modelling, especially to investigate the added contribution from China to generate established combined time-variable models to be included in the Combination Service for Time-variable Gravity Fields (COST-G). In addition, the simulation of constellation design for Chinese gravity satellites will be performed to pave the way to multi-pair gravity missions for improving our understanding of mass redistribution between the hydrosphere, cryosphere, atmosphere, and lithosphere.

Sentinel-6A: Orbit Determination using Galileo

20. August 2021:
On November 21, 2020, the satellite Sentinel-6A was launched into a low orbit. As the first Sentinel satellite it carries on board a GNSS receiver allowing it to also use the signals of the European Global Navigation Satellite System Galileo for orbit determination. The Astronomical Institute of the University of Bern (AIUB) is determining high precision orbit parameters of Sentinel-6A using GPS and Galileo within the framework of the Copernicus Precise Orbit Determination (POD) Quality Working Group.

Geodesy for a Sustainable Earth

2. July 2021:
Under the motto "Geodesy for a Sustainable Earth" the International Association for Geodesy (IAG) has held a scientific assembly with predominant online participation as a hybrid meeting in Peking from June 28 until 2 July 2, 2021. In his role as President of Commission 2 "Gravity Field", Prof. Adrian Jäggi from the Astronomical Institute of the University of Bern (AUB), together with the Vice-President of Commission 2, Prof. Mirko Reguzzoni from Politecnico di Milano, was in charge of organizing the conference’s symposia 2a "Static Gravity Field" and 2b "Time-variable Gravity Field". Both symposia together comprised overall 11 Sessions providing a comprehensive overview of the current research on the topic of Earth gravity field determination by 72 oral and 78 poster presentations. In Session 2b.1 "Analysis Methods", dealing with the methodologic relevant aspects of gravity field determination using satellite data, Prof. Jäggi was also chairing the meeting.

Repro3 – Reproccessing of 25 years of GNSS Data at CODE

24. June 2021:
The Center for Orbit Determination in Europe (CODE) affiliated at the Astronomical Institute of the University of Bern (AIUB) has reprocessed data amounting up to more than one Million single measurements of about 300 observing stations of the International GNSS Service during the year 2020 and generated with it a consistent time series. This product will be used to calculate high-precision coordinates and velocities of a global network of observing stations which will provide the stable geodetic foundation for future scientific applications.

Zimmerwald SLR station as World’s top class in week 13/2021

8. April 2021:
In calendar-week 13 of this year alone the satellite observation station in Zimmerwald of the Astronomical Institute of the University of Bern (AIUB) succeeded in measuring distances to over 700 satellites using a satellite laser ranging system. With this result it was the most successful station worldwide and was once more able to confirm and consolidate its foremost position at least of the northern hemisphere.

AIUB in the Advisory Board of BKG’s Gauss Center

11. March 2021:
The German Federal Agency for Cartography and Geodesy (BKG) has founded a virtual research center named “Gauss Center for Geodesy and GeoInformation”. The BKG will award contracts for research tasks to universities and research institutions via this center. On behalf of the BKG these institutions shall conduct diverse projects to gain new insights on different aspects within the disciplines of Geodesy and GeoInformation. The goal consists in subsequent using of the gained findings and developments of procedures and methods for operational works of the BKG. The Astronomical Institute of the University of Bern (AIUB), represented by its director Prof. Dr. Adrian Jäggi, is member of the advisory board of this center.

New AIUB – EUMETSAT – Collaboration

1. February 2021:
The Astronomical Institute of the University of Bern (AIUB) concluded a contract with the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT) to launch the
Bernese POD Scientific Service that shall be provided to the Remote Sensing and Products (RSP) Division within EUMETSAT’s Technical and Scientific Support (TSS) Department. EUMETSAT intends to apply the Bernese GNSS Software (BSW) as a baseline software for its scientific and operational activities related to precise orbit determination (POD) involving several missions such as EPS/Metop, Sentinel-3, EPS-SG, Sentinel-6/Jason-CS and other missions of opportunity. For this purpose, EUMETSAT has initiated a Scientific Service contributing to the maintenance and evolution of the BSW as required for EUMETSAT’s POD applications.

Operational combination of monthly GRACE-FO gravity field models

21. December 2020:
Since July 2019, the Astronomical Institute of the University of Bern (AIUB) operates the Combination Service for Time-Variable Gravity Fields (COST-G) of the International Association of Geodesy (IAG). COST-G first performs a quality control, analysing the signal content of the gravity fields provided by the GRACE-FO Analysis Centres (ACs), and then generates a combination. In November 2020, two years after the launch of the GRACE-FO satellites in May 2018, the combination at COST-G became operational, aiming at the combination of the monthly gravity fields derived from GRACE-Follow On (GRACE-FO) with short latency.

ILRS Virtual World Tour 2020

24. November 2020:
In place of an International Laser Ranging Station (ILRS) Workshop this November, the ILRS wanted to take the opportunity to try something different and look in detail at a selection of stations in the global network. This 'Virtual World Tour' took place online on November 2-6, 2020, virtually visiting 5 ILRS stations in 5 days, stopping among others also at Zimmerwald Observatory operated by the Astronomical Institute of the University of Bern, Switzerland.

Scale of Global Reference Frames from Galileo Data

3. November 2020:
The Center of Orbit Determination in Europe (CODE) of the Astronomical Institute of the University of Bern (AIUB) successfully demonstrated for the first time that the Global Navigation Satellite System (GNSS) could make an important and independent contribution to the determination of the scale when realizing new reference frames for the Earth thanks to the disclosure of the Galileo satellite antenna calibrations.

Callisto Geodesy

14. October 2020:
The subgroup "Orbit and Gravity Field Determination" of AIUB’s satellite geodesy group has recently initiated a new project, financed by the Swiss National Science Foundation, where the exploration of Callisto with an orbiting spacecraft is studied.

First Daylight Laser Measurements of a Space Debris Object

10. August 2020:
On June 24 2020, AIUB acquired the first ever daylight observations of a space debris object using a geodetic laser at the Swiss Optical Ground station and Geodynamics Observatory Zimmerwald. Such measurements may be essential to reduce the orbit uncertainty of space debris objects, hereby allowing spacecraft operators to identify close conjunctions and to devise and execute efficient avoidance maneuvers.

Breakup of an Atlas 5 upper stage observed

1. April 2019:

On March 26 we were informed by our Russian colleagues (Vladimir Agapov) that they discovered a breakup of the Atlas 5 upper stage 2009-047B (SSN 35816; apogee - 34708.9km, perigee – 6675.6km) on March 25, 2019, at 22:23 UTC. The following night we were successfully observing fragments from this event with 3 sensors at the Swiss Optical Ground Station and Geodynamics Observatory Zimmerwald. The attached animated gif shows a series of observations from the 0.8m ZimMAIN telescope.