To be sure this was just an asterism, I contacted the big kahuna Matthias Kronberger and asked for his expert opinion on it. He used VIZIER for the proper motion data and came to the same conclusion I did using Aladin (PPMX-data). So, the chance of stars simply aligning like this in the sky might seem remote (4% according to Brosch) but none the less the group is, unfortunately, just an asterism despite having similar spectra. A shame!
|Virgo Diamond courtesy of The Digitized Sky Survey|
On the night of 4th of April I went after the object like predicted. The conditions were everything but favorable: SQM-L showed 16.70 from Virgo (note that the meter most certainly had some interference from the nearby 94% moon) and 17.70 measurements from the opposite direction. Weather conditions were as follows: 70% humidity, air pressure 1022 hPa and temperature -2°C (28F). My trusty old 8" Orion DSE was selected for the task for the obvious reasons. It came as no surprise that the focuser was yet again nearly frozen solid and I'd have to use so force to get the things moving again.
|TYC 4948-53-1 group with 8" Orion DSE @ 200x (6')|