Reports Report 5113k (Event 5113-2017)

This report has been linked to the following event: Event 5113-2017
Observer
NamePaul T
Experience Level1/5
Remarks-
Location
AddressWellington, CO
Latitude40° 43' 12.8'' N (40.72°)
Longitude 104° 58' 15.78'' W (-104.97°)
Elevation1597.88m
Time and Duration
Local Date & Time2017-12-14 20:00 MST
UT Date & Time2017-12-15 03:00 UT
Duration≈3.5s
Direction
Moving directionFrom up right to down left
Descent Angle249°
Moving
Facing azimuth149.63°
First azimuth162.28°
First elevation38°
Last azimuth125.92°
Last elevation25°
Brightness and color
Stellar Magnitude-11
ColorOrange, Yellow
Concurrent Sound
ObservationNo
Remarks-
Delayed Sound
ObservationNo
Remarks-
Persistent train
ObservationUnknown
Duration-
Length-
Remarks-
Terminal flash
ObservationYes
RemarksAfter a few seconds (just long enough for me to register it wasn't an airplane I was seeing), it briefly expanded in size to about twice the size from when I initially noticed, changing from the more yellow/slight orange color to a more orange/slight yellow color.
Fragmentation
ObservationYes
RemarksAfter the flash, it broke into two (main) pieces, with an extremely brief collection of smaller debris around it (which faded almost immediately). One of the two pieces seemed to accelerate, maintaining the original trajectory for about half-to-one-second before fading. The second seemed to go at a slightly different angle (more directly downward), but at a slower rate for slightly longer (about one full second) before fading.