M37 is the largest (24 ' in diameter) of the Auriga
clusters and is located in a somewhat more detached area compared to the rich
star fields in the center of the constellation.
It is formed by at least 170 stars up to the thirteenth magnitude, while up to
the fifteenth magnitude these become over half a thousand.
The distance is estimated on about 4000 light years while its age is over 300
million years; it is therefore a cluster of fairly advanced age.
Technical data Optics 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 8x300" bin1 -20C G 7x300" bin1 -20C B 8x300" bin1 -20C Total integration 1.9h Acquisition Voyager, PHD2 Processing Pixinsight 1.8, Photoshop CS5 SQM-L 21.10 Location Promiod (Aosta Valley, Italy), own remote observatory Date 10 February 2018