Captain reported an near midair collision with a glider while on approach to mdw airport.

Narrative:

Very near miss/midair with white glider while on the FISSK4 arrival into mdw. Was at 250 knots [and] 4;000 feet as I recall in contact with chicago. Approximately over igq airport; close to the boundary of the mode C veil on the charts. Glider came from left to right; I saw it at the last second and realized it was going to come very close in front of us but we were not going to collide. No time to react or even say anything or take the controls from the sic. I alerted chicago of the near miss and at that time said we missed by 500 feet. After analyzing the event it was much closer; maybe 100 feet - 200 feet vertical and horizontal. I could see the pilot inside the glider. No TCAS alert or target; even with it on the 7.5 mile range. Chicago had no target or communications with the glider. No evasive maneuver was accomplished. Landed uneventful and passengers were unaware of the event.

Original NASA ASRS Text

Title: Captain reported an NMAC with a glider while on approach to MDW airport.

Narrative: Very near miss/midair with white glider while on the FISSK4 arrival into MDW. Was at 250 knots [and] 4;000 feet as I recall in contact with Chicago. Approximately over IGQ airport; close to the boundary of the mode C veil on the charts. Glider came from left to right; I saw it at the last second and realized it was going to come very close in front of us but we were not going to collide. No time to react or even say anything or take the controls from the SIC. I alerted Chicago of the near miss and at that time said we missed by 500 feet. After analyzing the event it was much closer; maybe 100 feet - 200 feet vertical and horizontal. I could see the pilot inside the glider. No TCAS alert or target; even with it on the 7.5 mile range. Chicago had no target or communications with the glider. No evasive maneuver was accomplished. Landed uneventful and passengers were unaware of the event.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1678539
Time
Date	201908
Local Time Of Day	1201-1800
Place
Locale Reference	MDW.Airport
State Reference	IL
Environment
Light	Daylight
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Route In Use	STAR FISSK4
Flight Plan	IFR
Aircraft 2
Make Model Name	Sail Plane
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 100 Vertical 100