C210 pilot reported an air carrier aircraft passed about 500 feet below his aircraft in the vicinity...

Attributes
ACN	1299899
Time
Date	201509
Local Time Of Day	0601-1200
Place
Locale Reference	CVG.TRACON
State Reference	KY
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Cessna 210 Centurion / Turbo Centurion 210C 210D
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	None
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Person 1
Function	Single Pilot Pilot Flying
Qualification	Flight Crew Instrument Flight Crew Private
Experience	Flight Crew Last 90 Days 15 Flight Crew Total 285 Flight Crew Type 112
Events
Anomaly	Conflict Airborne Conflict
Miss Distance	Horizontal 0 Vertical 500

Narrative:

I was VFR at 11;500 feet; west of cvg; not communicating with cincinnati approach; but monitoring their frequency. I saw a passenger jet approaching from my 10 o'clock; approximately 6 miles; 11;000 feet. This was confirmed by ads-B TCAS; which showed the other aircraft was descending. I maintained visual separation; no action necessary. I then heard approach ask the other aircraft if he had a visual on traffic '12 o'clock; indicating 11;600 feet.' which would have been my position relative to his aircraft. I could hear no responses from the other aircraft; but approach continued to ask if he had a visual on traffic; even after the jet passed my position. The jet passed approximately 500 feet below my aircraft.because of the time of day and aircraft positions; the sun was likely obscuring my aircraft from view; contributing to the other pilot's inability to get a visual on traffic.flying with VFR flight following or on an IFR flight plan would have opened communications between myself and cincinnati; which would have allowed a confirmation of my position to approach; and vectoring traffic for further separation.

Original NASA ASRS Text

Title: C210 pilot reported an air carrier aircraft passed about 500 feet below his aircraft in the vicinity of CVG airport.

Narrative: I was VFR at 11;500 feet; west of CVG; not communicating with Cincinnati approach; but monitoring their frequency. I saw a passenger jet approaching from my 10 o'clock; approximately 6 miles; 11;000 feet. This was confirmed by ADS-B TCAS; which showed the other aircraft was descending. I maintained visual separation; no action necessary. I then heard approach ask the other aircraft if he had a visual on traffic '12 o'clock; indicating 11;600 feet.' Which would have been my position relative to his aircraft. I could hear no responses from the other aircraft; but approach continued to ask if he had a visual on traffic; even after the jet passed my position. The jet passed approximately 500 feet below my aircraft.Because of the time of day and aircraft positions; the sun was likely obscuring my aircraft from view; contributing to the other pilot's inability to get a visual on traffic.Flying with VFR flight following or on an IFR flight plan would have opened communications between myself and Cincinnati; which would have allowed a confirmation of my position to approach; and vectoring traffic for further separation.

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.

C210 pilot reported an air carrier aircraft passed about 500 feet below his aircraft in the vicinity of cvg airport.