I've seen several fireballs before and had no inclination to report them but this event was drastically different from the former observations. The first striking difference was the emerald color. The second difference was the perceived altitude from which it started to get brighter as it was nearly on the horizon when it reached it's apex brightness. Thirdly was the trajectory. It seemed to have fallen straight downward and dead north from my perspective.
Location
Address
Round Lake Heights, IL
Latitude
42° 23' 25.22'' N (42.390338°)
Longitude
88° 6' 17.69'' W (-88.104914°)
Elevation
240.330887m
Time and Duration
Local Date & Time
2015-07-22 22:53 CDT
UT Date & Time
2015-07-23 03:53 UT
Duration
≈1.5s
Direction
Moving direction
From up to down
Descent Angle
180°
Moving
Facing azimuth
0.05°
First azimuth
0.05°
First elevation
20°
Last azimuth
0.05°
Last elevation
-
Brightness and color
Stellar Magnitude
-7
Color
Green
Concurrent Sound
Observation
No
Remarks
-
Delayed Sound
Observation
No
Remarks
-
Persistent train
Observation
No
Duration
-
Length
-
Remarks
-
Terminal flash
Observation
Yes
Remarks
As the object neared the horizon it got brighter with and stayed intact with noticeable small pieces 'popping' off, similar to sparks.
