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June 3, 2023


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Tyrifjorden, Norway

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Tyrifjorden Meteor

Sollihøgda, Norway – July 25, 2021, 1:08 AM local time, cameras belonging to the Norwegian Meteor Network, detected a meteor, travelling southwest near Oslo and ending above Tyrifjorden (Lake Tyri), in a forested mountain region of Norway, called Buskerud.

This was a relatively large event, and it is likely that meteorite fragments reached the ground. Refer to the sections below for details and maps, which you can download to Google Earth.

Entry Date/Time:2021-07-24 23:08:49 UTC
End Location:10km west of Oslo
Endpoint Coordinates:59.908°N, 10.207°E
Reference Altitude:23.5 km above sea level
Energy / Mass Estimate:< 5 tonne TNT / 100kg
Reference Speed:14.5 km/s
Bearing:222° SW
Slope:63° from vertical
Estimated Strewn Mass:< 28 kg
Event Links:Norsk Meteornettverk
AMS Event 3995-2021

Video and News

Several videos of the event were captured from various locations across Southern Ontario. NASA cameras also captured this event on a network of calibrated cameras, which were used to calculate the trajectory (NASA videos not shown here).

Video from Oslo

Video from a house at Bøleråsen


Search Efforts

The the fall zone is mostly forested, but there are clearings that could provide good ground for searching. It is unknow

If you would like to search for for meteorites from this or future events in this region, please join the Facebook group:

Join the Strewnify Europe Facebook Group

StrewnLAB Search Area

A trajectory has been estimated by the Norsk Meteornettverk, using video data from at least six calibrated cameras in their network, so the data quality should be very good. This data was processed using the StrewnLAB software, to predict a search area. Please download and review the Google Earth files below for detailed maps of the search area.

Another search area has also been calculated and posted on the Norsk meteornettverk Facebook page, and it agrees closely with the Strewnify map, although it it limited to a smaller area. This could be due to modeling a smaller mass range and/or more precise estimation of fragmentation events.

Weather Data

The weather data below is sourced from weather balloons, and publicly available via NOAA’s Integrated Global Radiosonde Archive (IGRA). This data is downloaded and post-processed by the StrewnLAB algorithm, to account for changing weather patterns and weather balloon drift. The plots have altitude on the y-axis, in kilometers above sea level. The wind speed below 10km has large effect on the drift of meteorites.

There was very little wind at the time of the event, so meteorite drift should be minimal

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