Fireball moved very quickly due north. Entire event lasted 4-5 seconds before visible portion ended. Roughly half of the event included fragmentation..
Location
Address
Riverton, WY
Latitude
43° 2' 10.31'' N (43.036198°)
Longitude
108° 23' 34.82'' W (-108.393006°)
Elevation
1522.563599m
Time and Duration
Local Date & Time
2018-12-17 20:24 MST
UT Date & Time
2018-12-18 03:24 UT
Duration
≈3.5s
Direction
Moving direction
From up to down
Descent Angle
180°
Moving
Facing azimuth
-
First azimuth
10°
First elevation
75°
Last azimuth
10°
Last elevation
45°
Brightness and color
Stellar Magnitude
-11
Color
White
Concurrent Sound
Observation
No
Remarks
-
Delayed Sound
Observation
No
Remarks
-
Persistent train
Observation
No
Duration
-
Length
-
Remarks
-
Terminal flash
Observation
No
Remarks
-
Fragmentation
Observation
Yes
Remarks
About two seconds after I first observed the fireball, it broke into fragments that continued to spread out over several seconds.
