We saw the fireball while driving on the freeway—didn’t ’t think to report it until some miles later. Time and location of sighting is a rough estimate.
Location
Address
Nephi, UT
Latitude
39° 45' 20.97'' N (39.755824°)
Longitude
111° 50' 4.55'' W (-111.834596°)
Elevation
1554.676m
Time and Duration
Local Date & Time
2017-12-01 23:42 MST
UT Date & Time
2017-12-02 06:42 UT
Duration
≈3.5s
Direction
Moving direction
From up left to down right
Descent Angle
133°
Moving
Facing azimuth
15.47°
First azimuth
355.22°
First elevation
39°
Last azimuth
22.78°
Last elevation
2°
Brightness and color
Stellar Magnitude
-22
Color
Light Green, White
Concurrent Sound
Observation
Unknown
Remarks
-
Delayed Sound
Observation
Unknown
Remarks
-
Persistent train
Observation
Yes
Duration
99.99s
Length
99.99°
Remarks
Smoke train, stretching across the whole sky, MUCH THICKER than any plane trail
Terminal flash
Observation
Yes
Remarks
Bright flash, then fireball moving slowly, sudden acceleration to behind mountain horizon
