Reports Report 5262j (Event 5262-2019)

This report has been linked to the following event: Event 5262-2019
Observer
NameTyler B
Experience Level1/5
RemarksCoolest thing I've ever seen from an airplane!
Location
Address, MT
Latitude47° 29' 25.21'' N (47.49°)
Longitude 113° 5' 44.2'' W (-113.1°)
Elevation2143.74m
Time and Duration
Local Date & Time2019-10-26 18:54 MDT
UT Date & Time2019-10-27 00:54 UT
Duration≈3.5s
Direction
Moving directionFrom up left to down right
Descent Angle135°
Moving
Facing azimuth240°
First azimuth230°
First elevation30°
Last azimuth245°
Last elevation15°
Brightness and color
Stellar Magnitude-8
ColorLight Blue
Concurrent Sound
ObservationUnknown
Remarks-
Delayed Sound
ObservationUnknown
Remarks-
Persistent train
ObservationYes
Duration30s
Length15°
RemarksPhoto submitted was of smoke train. Moving too quick to attempt to photograph actual fireball. Just enjoyed the view for 2-3 seconds, then photographed the smoke train at least 10 seconds after the fireball. Estimate smoke trail was visible for at least 30-45 seconds, but started to dissipate and became "wavy" in nature quite quickly. Was photographed from the cockpit of a Boeing 737 at 35,000 feet, on a course of 170 degrees magnetic, at a lat long of N47.4271, W113.0036 (GPS estimate +/- 30 seconds at ground speed of 500 knots). I was unable to enter a lat long at my initial position estimate on the first steps here, so I did my best to approximate, but the lat long is much more accurate obviously.
Terminal flash
ObservationYes
RemarksAt least one bright flash, possibly two. Unsure of fragmentation, if so it was not clear. My estimate for luminosity was conservative in nature, the flash itself was many orders of magnitude brighter than the trail itself. Definitely erratic in nature, 100% not a contrail (I am an airline pilot). The first flash was bright enough to catch my attention while looking inside the cockpit, out of the corner of my eye and at the upper edge of the cockpit window.
Fragmentation
ObservationUnknown
Remarks-