We were driving down the interstate. Two of us in the front seats saw it and it surprised us so much we pulled over! After watching videos of other fireballs this matched what we saw exactly.
Location
Address
Bearmouth, MT
Latitude
46° 42' 2.53'' N (46.700703°)
Longitude
113° 20' 41.34'' W (-113.344818°)
Elevation
1154.617554m
Time and Duration
Local Date & Time
2021-08-29 12:39 MDT
UT Date & Time
2021-08-29 18:39 UT
Duration
≈1.5s
Direction
Moving direction
From up left to down right
Descent Angle
171°
Moving
Facing azimuth
54.98°
First azimuth
98.21°
First elevation
25°
Last azimuth
105.35°
Last elevation
17°
Brightness and color
Stellar Magnitude
-13
Color
White
Concurrent Sound
Observation
Unknown
Remarks
-
Delayed Sound
Observation
Unknown
Remarks
-
Persistent train
Observation
No
Duration
-
Length
-
Remarks
-
Terminal flash
Observation
Yes
Remarks
Bright flash at the very end and then the whole sighting disappeared
