The Ptolemy Cluster, M 7, is a naked eye open cluster in Scorpius.
Hover over the picture for an annotated version
Date: 26 and 31 July 2024
FOV: 3° 15' × 2° 10'; the angular size of M7 is about 80'
Telescope: Askar FRA300 pro (300mm f/5 Petzval)
Guiding: ZWO ASI120MM mini mono guide camera,
SVBony SV165 Mini 40mm f/4 guide scope
Computer: ASIair pro Raspberry Pi
Mount: ZWO AM5 harmonic drive
Camera: ZWO ASI6200MC Pro Cooled (-10°C) Color CMOS
Pixel size: 3.76 μm
Resolution: 2.599 arcsec/pixel
Frames:26 July 202423 × 240 seconds × 100 gain,
31 July 202418 × 240 seconds × 100 gain
Filter: Optolong UV-IR cut filter
Stacking: forty-one 240 second frames using Pixinsight
Calibration frames: 20 dark, 20 flat, 20 dark flats each session
Total Time: 2 hours and 44 minutes
Processing: Pixinsight – DynCrop, SPCC, DBE, SPCC, BXT, NXT,
HST, GHS, MStr, PMath 5MStr + 3GHS + 2HST → PM,
HDR8ph, PMath average PM and HDR8ph, Sat, Scale
Location: Darling Hill Observatory near Vesper, NY
