Image of NGC 3532, an open star cluster containing 120 stars, on the outskirts of the Carina nebula. It was taken from my home location with a total exposure of 32 minutes.
I’ve had ongoing problems with intermittent frame dropping and on this night I had to cut short my imaging, as no more of the 29 second still frame exposures were being received by SharpCap, amid warning dings from my laptop.
Subsequent to this I have spent a lot of time testing all my USB3 cables and found a 2m cable which transmitted frames consistently, while most did not. However, I really would like to use a longer cable and my suspicion is that the USB system in my laptop is not up to scratch. 😕
NGC 3532, Caldwell 91
Visual magnitude: +3.0
Apparent size: 50′
Diameter: 23.3 light years.
Distance: 1600 light years.
Altitude: 55° above SW horizon.
Exposure: 32m 37s (67 frames 29.2s).
Date: 6th May 2019.
Location: Outer suburban.
Conditions: Mostly clear.
Sky: 1.80 e/pixel/s
Image acquisition software: SharpCap, live stacked.
Image post-processing: GIMP.
Diffraction spikes: added.
|Telescope:||SkyWatcher Esprit||Type:||120ED triplet refractor|
|Focal:||840 mm F/7||Mount:||SkyWatcher EQ6-R Pro|
|Camera:||ZWO ASI 071 MC Pro||Type:||CMOS 28.4mm 16 Mpx|
|Optical aids:||Flattener: Y; filter: N||Guiding:||No|
|Polar aligning:||QHYCCD PoleMaster||Polar Error:||04’ 05”|
Also relevant: Star Cluster Portfolio
Image © Roger Powell