Reports Report 4230a (Event 4230-2015)

Observer
Name Mike H
Experience Level 2/5
Remarks This was unlike anything I've seen before. It was perfectly circular and extremely bright. It lasted for six seconds, first two seconds it was like a bright star. Then for the next two seconds it became intensely brighter and to full diameter of at least 10 times that of Venus. From seconds 4 to 6 it remained at full brightness, then almost appeared to pop out of existence. The anomaly was stationary in the sky. It did not move relative to my position.
Location
Address Auburn, CA
Latitude 38° 52' 23.94'' N (38.873317°)
Longitude 121° 5' 23.71'' W (-121.089919°)
Elevation 395.068481m
Time and Duration
Local Date & Time 2015-07-16 21:45 PDT
UT Date & Time 2015-07-17 04:45 UT
Duration ≈3.5s
Direction
Moving direction From up left to down right
Descent Angle 166°
Moving
Facing azimuth 345°
First azimuth 345°
First elevation 15°
Last azimuth 345°
Last elevation 15°
Brightness and color
Stellar Magnitude -16
Color White
Concurrent Sound
Observation No
Remarks -
Delayed Sound
Observation No
Remarks -
Persistent train
Observation No
Duration -
Length -
Remarks -
Terminal flash
Observation Yes
Remarks A bright star appeared below the Big Dipper, then increased in size to 10 times the diameter of Venus, and finally burst an brighter light before darkening to nothing.
Fragmentation
Observation No
Remarks -