M10 is a globular cluster in the constellation of Ophiucus.
It is located in an area of sky far from bright stars, but thanks to its
magnitude of 6.6 is easily visible with binoculars.
The cluster is one of the closest to us since it is only 14,000 light years
away. Despite a modest diameter of only 60 light years, its apparent diameter
is rather large and is equivalent to half the diameter of the full moon.
Technical data Optic Tecnosky Apo Refractor LT 130 - 910mm f/7 Mount 10Micron GM2000 HPSII Camera Moravian G3-16200 with external filter wheel 7 positions Filters Baader RGB 50.8 unmounted Guiding system OAG Moravian M68 with guide camera Moravian G1-0301 Exposure details R 6x300" bin1 -10C G 5x300" bin1 -10C B 6x300" bin1 -10C Total integration 1.4h Acquisition Voyager, PHD2 Processing Pixinsight 1.8, Photoshop CS5 SQM-L 21.50 Location Promiod (Aosta Valley, Italy), own remote observatory Date 13 June 2018