Narrative:

I was just assuming the sector after receiving a briefing from the controller I was relieving. Aircraft X was westbound level at 5000 feet IFR. The pilot of aircraft X said 'we've finally got that dash in sight'. I looked at the scope; thinking that he had gotten a DH8A in sight that was still at his 2 o'clock and about 9 miles but was caught off guard when I realized that he probably wasn't talking about that DH8A because it would have been difficult for him to see him at that point. I asked him to repeat and he did. I then noticed a limited data block descending through the altitude of aircraft X southeast bound. I realized that the final controller had descended aircraft Y into my airspace without a point out and had not seen aircraft X. I believe separation was lost between these two IFR aircraft.by the time I noticed aircraft Y in my airspace he was already no factor for aircraft X. He was descending below him and turning southbound away from aircraft X. I did not need to issue evasive action. This was caused by the final controller allowing aircraft Y to enter my airspace without approval and not recognizing the conflict with aircraft X. The final controller should not enter another controller's airspace without coordination.

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Original NASA ASRS Text

Title: PHL TRACON Controller reported that a Controller failed to make a radar point out to the reporter's adjacent sector.

Narrative: I was just assuming the sector after receiving a briefing from the controller I was relieving. Aircraft X was westbound level at 5000 feet IFR. The pilot of Aircraft X said 'We've finally got that Dash in sight'. I looked at the scope; thinking that he had gotten a DH8A in sight that was still at his 2 o'clock and about 9 miles but was caught off guard when I realized that he probably wasn't talking about that DH8A because it would have been difficult for him to see him at that point. I asked him to repeat and he did. I then noticed a limited data block descending through the altitude of Aircraft X southeast bound. I realized that the Final controller had descended Aircraft Y into my airspace without a point out and had not seen Aircraft X. I believe separation was lost between these two IFR aircraft.By the time I noticed Aircraft Y in my airspace he was already no factor for Aircraft X. He was descending below him and turning southbound away from Aircraft X. I did not need to issue evasive action. This was caused by the Final Controller allowing Aircraft Y to enter my airspace without approval and not recognizing the conflict with Aircraft X. The Final Controller should not enter another controller's airspace without coordination.

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.