Object: Open cluster Do 42 Constell: CYG RA: 20h 19.8m Decl: +38° 08' Epoch: 2000 Mag: Size: 11' Type: IV 1 p n Observer: Jere Kahanpää Obs. place: Jyväskylä, Finland Date/Time: 8./9.8.1996, 01.35 Telescope: N 205/1000 Magn: 80x Filter: Field: 37' NE Lim.mag: 5.2m Background sky: 4-5 Seeing: 3 Weather: +10 °C, 1/3 Moon low E. Brightness: 4 Alt: Description: About 15 stars mag. 10... E of a 8m star. Est. diameter 10'. Two subgroups: The first is in the immediate surroundings of the 8m star and the second about 5' ESE. The latter consists of faint stars (mag. 11,12...13) but is richer than the first. Megastar shows the cluster around the fainter group but the size easily includes both groups and the first is actually easier to recognise as a concentration of stars.