Caldwell 104

Object Details:

Designation:  C104, NGC 362     Constellation:  Tucana
Visual magnitude:   +6.4              Apparent size:    14′
Diameter:   114 light years.        Distance:   28,000 light years

It’s a couple of days past the Full Moon, the Moon is waning and the next astro-viewing window is about to open – and I still have images from the last cycle which I haven’t posted.

The window “opens” a few days after Full Moon, with the waning Moon rising later in the evening. It “closes” over two weeks later, as the crescent Moon waxes to First Quarter and gets too bright for serious deep sky observing.

So here is NGC 362, a pretty globular cluster, which I imaged on a field trip with Macarthur Astronomical Society over three weeks ago with no Moon in the sky.

Located adjacent to the Small Magellanic Cloud (but a lot closer), NGC 362 is often overlooked in favour of the much brighter, closer and thus more visually appealing 47 Tucanae situated only 3° away.

NGC 362 is about 10.4 billion years old, making it a relatively young globular cluster. Astronomers know this by the higher metallicity of its stars, compared to other globular clusters.

Technical stuff:

Image & Processing:

Date:  2019-10-19
Exposure:   18 x 103  sec  =  31  min.
Gain:  0

Location:  semi-dark rural.
Conditions:  clear, windy, no Moon
Sky brightness:  1.19 e/pixel/sec . 

Image acquisition:  SharpCap.
Method: Live stacked.
Darks: 6x

Image post-processing:  GIMP.
Cropping: yes



Telescope: SkyWatcher Esprit  Type: 120 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: LP Guiding: Yes/No
Polar aligning: QHYCCD PoleMaster Polar Error: 56”

Geek Log:

[ZWO ASI071MC Pro]
Debayer Preview=On
Output Format=FITS files (*.fits)
Capture Area=4944×3284
Colour Space=RAW16
Hardware Binning=Off
Turbo USB=40
Frame Rate Limit=8 fps
Timestamp Frames=Off
White Bal (B)=50
White Bal (R)=53
Cooler Power=39
Target Temperature=-5
Auto Exp Max Gain=300
Auto Exp Max Exp M S=30000

Auto Exp Target Brightness=100
Mono Bin=Off
Anti Dew Heater=On
Banding Threshold=35
Banding Suppression=0
Apply Flat=None
Subtract Dark=C:\Users\Roger\Desktop\SharpCap Captures\darks\ZWO ASI071MC Pro\RAW16@4944×3284\103.1s\gain_0\dark_6_frames_-5.3C_2019-10-19T10_37_10.fits
#Black Point
Display Black Point=0
#MidTone Point
Display MidTone Point=0.638095238095238
#White Point
Display White Point=1

Also in image:  See my image with annotated overlay.

Images © Roger Powell

2018-03-10 Telescope & Roger




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