Patch Grove
Grant County, Wisconsin, USA
- Found by MetDetect
- Human-verified · Marc Fries
- No meteorites recovered
- Fireball (UTC)
- 2022-01-20 12:48:03 ± 30 s NASA Meteoroid Environment Office
- Radar searched
- KARX
- Meteorites
- none recovered
- MetDetect
- MetDetect RUN-41 held-out fall · radar KARX
Automated detection
MetDetect searched the KARX radar around the fireball time. It found the fall: the radar cells it reports are mostly the debris identified by hand.
- 17of the 22 hand-identified cells on KARX found
- 5hand-identified cells missed
- 0cells reported that were not identified by hand
MetDetect RUN-41, 29 Oct 2026. Leave one fall out: every learned part was trained without the fall it is scored on. The design falls were used to develop the method, so their scores are development results; the held-out falls were not. This fall was held out. The hand identification is the reference these numbers are graded against.
Dark flight
After the fireball goes dark, meteorites fall freely through the wind. Each radar cell is flown down to the ground through the winds of that day; the coloured areas show where stones of each mass most likely landed, and the black line runs from light to heavy stones (solid where the radar traced it, dashed where extended).
Pixel estimate, computed by P. Shober with MetDetect: winds from ERA5 (ECMWF), masses for an ordinary-chondrite density over a range of shapes. Preliminary: it does not fit the fireball itself, so the heavy end of the line is an extrapolation.
Human identification
The radar signatures of this fall were identified by hand by Marc Fries (NASA ARES, Johnson Space Center). Read the original report (archived copy).
Meteorites
No meteorites reported.
Publications
No papers on this fall yet that we know of.
Know of a paper or a recovered meteorite we missed? Tell us.
