Emb-145LR first officer reported a near midair collision with a possible uav during descent.

Attributes
ACN	1657681
Time
Date	201906
Local Time Of Day	1201-1800
Place
Locale Reference	PHL.Airport
State Reference	PA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	EMB ERJ 145 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Aircraft 2
Make Model Name	UAV - Unpiloted Aerial Vehicle
Operating Under FAR Part	Other 107
Flight Phase	Cruise
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Private Flight Crew Instrument Flight Crew Commercial Flight Crew Multiengine
Events
Anomaly	Conflict NMAC Inflight Event / Encounter Object

Narrative:

While in the descent between 10;000 and 8;500 feet captain asked me; 'did you see that?' I looked up in time to see an object going by the nose of the airplane; a few feet above us and opposite direction. The object passed us so quickly I did not have time to really get a look at it. The captain asked if it was a drone; I said it might have been but I wasn't sure. The captain notified ATC that we had a drone pass closely by us. The closure rate and size of the object meant that was not sufficient time to react if it had been necessary. Luckily the object missed us. The flight continued without further event.

Original NASA ASRS Text

Title: EMB-145LR first officer reported a NMAC with a possible UAV during descent.

Narrative: While in the descent between 10;000 and 8;500 feet Captain asked me; 'Did you see that?' I looked up in time to see an object going by the nose of the airplane; a few feet above us and opposite direction. The object passed us so quickly I did not have time to really get a look at it. The Captain asked if it was a drone; I said it might have been but I wasn't sure. The Captain notified ATC that we had a drone pass closely by us. The closure rate and size of the object meant that was not sufficient time to react if it had been necessary. Luckily the object missed us. The flight continued without further 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.