tried for HR 6594 C (Halifax)

I asked the Burke-Gaffney system to photograph HR 6594. aka Burnham 1251. A multi-star system in Hercules. Centred on TYC 01551-1256 1. It was a target I had selected for calibration purposes back in July 2015.

Luminance only, 2 seconds subexposures, 10 stacked shots. FITS Liberator, Paint.NET. North is up; east is left.

In particular, I was after the faint C companion. I exaggerated the contrast stretching to pull out the faint stars. Got it! Due west, a good distance away.

C appears to be the same brightness as J174205.7+155642 to the east (magnitude 15.3, according to ST3P), J174159.3+155332 to the south (15.3), or GSC 01551-1800 to the north-west (14.85, poor quality). So, I think we're talking about a mag 15 star. And that's why it didn't show in a 1 second exposure in a 14" telescope...