Gem Cluster

A previously unposted archive image of this Southern Hemisphere object, taken earlier this year whilst testing the new ZWO 071 camera.

Object Details:

NGC 3293
Constellation: Carina.
Visual magnitude: +4.7
Apparent diameter: 6.0 arc-min. (about one fifth of a Lunar Diameter).
Actual diameter: 13.2 light years.
Distance: 7,600 light years.
Altitude: 59° above SE horizon.

 

Image:

Exposure: 15 min
Date: 2018-02-24.
Location: Leumeah, NSW.
Environment: outer suburban.
Sky: mostly clear.
Moon: First Quarter Moon (NM+8).
Image acquisition software: SharpCap.
Image post-processing: PIPP > GIMP.
Cropping: yes.

Gear:
Imaging telescope: Skywatcher Esprit 120ED Super APO triplet refractor.
Focal length: 840 mm, focal ratio: f/7.
Imaging camera: ZWO ASI 071 MC Pro.
Guiding camera: Orion StarShoot.
Guiding control software: PHD2.
Telescope mount: SkyWatcher EQ6-R.
Polar aligning method: QHYCCD PoleMaster.
Field flattener: yes; filter: no.

Observing Notes:
Still had Synscan providing innacurate celestial alignment, thus some trailing is evident.

SharpCap Camera Settings:

[ZWO ASI071MC Pro]
Debayer Preview=On
Pan=0
Tilt=0
Output Format=FITS files (*.fits)
Binning=1
Capture Area=4944×3284
Colour Space=RAW8
Hardware Binning=Off
Turbo USB=80(Auto)
Flip=None
Frame Rate Limit=2 fps
Gain=427
Exposure=2
Timestamp Frames=On
White Bal (B)=1(Auto)
White Bal (R)=99(Auto)
Brightness=53
Temperature=27.8
Cooler Power=100
Target Temperature=-2
Cooler=On
Auto Exp Max Gain=300
Auto Exp Max Exp M S=30000
Auto Exp Target Brightness=100
Mono Bin=Off
Anti Dew Heater=Off
Apply Flat=None
Subtract Dark=None
#Black Point
Display Black Point=0
#MidTone Point
Display MidTone Point=0.475
#White Point
Display White Point=1
TimeStamp=2018-02-24T12:58:37.2404150Z
SharpCapVersion=3.1.5029.0
TotalExposure(s)=900
StackedFrames=450


Image © R.Powell


 

 

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