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At Jul.2,2020,02h32m03s UT(=Jul.5, 17h32m03s LT), A bright fireball appeared from Kanagawa prefecture to north of the Tokyo bay.
Daichi Fujii(Kanagawa pref.), KAGAYA, SonotaCo(Tokyo pref.), Orio Takahashi, and I (Hyogo pref.) observed
this fireball by automatic TV cameras. M.Ueda calculated the trajectory and orbit.
That night was cloudy around the impact area therefore unclear fireball images and most of the images are saturated because of very brightness.
Fireball fragmentation was also observed. These environments made it difficult to measure the fireball position on each image.
Preliminary calculations were shown especially low endding height about 20km.
It was expected us the fell meteorites on the ground where is the urban city.
We(SonotaCo network) just started to study aimes to meteorites find.
Detail data was published in "SonotaCo Network" articles.(in Japanese)
Initial geocentric velocity was 16.6km/s and end velocity was 4.6km/s which was 22.7 km altitude.
Mr. KAGAYA image and other some images are shown meteorite fragmentations.
Some fragmentation occurs in half of the luminous path and more, four fragments were released near the fireball disappeared.
The later four fragments possibly fell to the ground with the main piece.
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The meteorite fell estimating calculation are favorite results that some meteorites fell on Narashino city and Hanamigawa ward, Chiba city.
Estimated meteorite mass is 1.5 kg for maximum fragment and some smaller fragments also will fell.
Smaller fragments fell earlier, landing on the west side.
The recovered total meteorites were three fragments that landed north 1 -4 km than the predicted areas.
The recovered meteorites' mass is No.1:130g, No.2:350g and No.3:15g for individual total however most of No.3 mass already might loss.
Unrecoverd bigger meteorite possible to exist on east side area from three recovered points.
Predicted the impact area and the meteorite recovered points
A part of Chiba prefecture
Red spots are predicted impact areas by using some estimated initial value.
The star marks indicate impact points.
(Added on "Geospatial Information Authority of Japan" map.)
Link
The Meteoritical Society
[National Science Museum] The Narashino meteorite has been registered by The Meteoritical Society.
[National Science Museum] Narashino Meteorite No.2 has been recovered in Funabashi city.
[National Science Museum] Narashino Meteorite No.3 has been recovered.