Context :

Aims : We are searching for new open clusters or moving groups in the Solar neighbourhood .

Methods : We used the Gaia-TGAS catalogue , cut it into narrow proper motion and parallax slices and searched for significant spatial over-densities of stars in each slice .
We then examined stars forming over-densities in optical and near-infrared colour-magnitude diagrams to determine if they are compatible with isochrones of a cluster .

Results : We detected a hitherto unknown moving group or cluster in the Upper Centaurus Lupus ( UCL ) section of the Sco-Cen OB-association at a distance of 175 pc from the Sun .
It is a group of 63 co-moving stars with ages of less than 10 to about 25 Myr .
For the brightest stars , which are present in the Gaia-TGAS catalogue the mean difference between kinematic and trigonometric distance moduli is -0.01 mag with a standard deviation of 0.11 mag .
Fainter cluster candidates are found in the HSOY catalog , where no trigonometric parallaxes are available .
For a subset of our candidate stars , we obtained radial velocity measurements at the MPG/ESO 2.2-metre telescope in La Silla .
Altogether we found twelve members with confirmed radial velocities and parallaxes , 31 with parallaxes or radial velocities , and 20 candidates from the convergent point method .
The isochrone masses of our 63 members range from 2.6 M _ { \odot } to 0.7 M _ { \odot } .

Conclusions :