I found the map confusing. I saw something in daylight sky facing southwest from Old Faithful geyser towards Idaho. It was silver and looked like a shooting star, flaring out at the end. It was silver and bright. The time is approximate. It WAS between 12:45 and 12:55 Mountain time.
Location
Address
Yellowstone National Park, WY
Latitude
44° 27' 34.78'' N (44.45966°)
Longitude
110° 49' 54.47'' W (-110.831796°)
Elevation
2244.824707m
Time and Duration
Local Date & Time
2021-08-29 12:43 MDT
UT Date & Time
2021-08-29 18:43 UT
Duration
≈1.5s
Direction
Moving direction
From down right to up left
Descent Angle
315°
Moving
Facing azimuth
125.19°
First azimuth
124.63°
First elevation
57°
Last azimuth
121.73°
Last elevation
59°
Brightness and color
Stellar Magnitude
-18
Color
White
Concurrent Sound
Observation
No
Remarks
-
Delayed Sound
Observation
No
Remarks
-
Persistent train
Observation
No
Duration
-
Length
-
Remarks
-
Terminal flash
Observation
Yes
Remarks
I saw a silver line across the sky ending in a flash
