We are a group of amateur astronomers and ham radio operators. The flash was so bright that it was startling. Some of our group was in Homer Glen Illinois conducting a public observing session. We decided to try our luck at our "Dark site" in Yorkville Illinois. We had some BSAA troops stop by and shared some views with them also. By 1:00am I took an SQM reading of 20.15. One of the best readings out there to date.
Location
Address
Yorkville, IL
Latitude
41° 37' 44.37'' N (41.628993°)
Longitude
88° 32' 22.29'' W (-88.539526°)
Elevation
187.101135m
Time and Duration
Local Date & Time
2013-09-27 22:33 CDT
UT Date & Time
2013-09-28 03:33 UT
Duration
≈1.5s
Direction
Moving direction
From up to down
Descent Angle
180°
Moving
Facing azimuth
85°
First azimuth
85°
First elevation
15°
Last azimuth
85.5°
Last elevation
-
Brightness and color
Stellar Magnitude
-23
Color
Green
Concurrent Sound
Observation
No
Remarks
-
Delayed Sound
Observation
No
Remarks
-
Persistent train
Observation
Yes
Duration
1s
Length
15°
Remarks
A flash of green lit lit up the area like somebody had lit off a firework. A glowing smoke trail. The green light seemed to drain from top to bottom as water from a straw then it was all gone.
