Designation: NGC 7793
Visual magnitude: +9.2
Apparent size: 10.4′ x 6.0′
Diameter: 37,000 light years.
Distance: 12 million light years
NGC 7793 is a flocculent galaxy, which means it looks fluffy and has discontinuous spiral arms. I have to admit I did not know that, so I put it the title so I might remember it.
The galaxy, a dwarf spiral, is one of thirteen galaxies in the Sculptor Group of galaxies – a group of galaxies fairly “close” to the Local Group, as shown below:
A clear sky was forecast for this field trip with Macarthur Astronomical Society but as luck would have it, three new large bushfires started up to our west and we were “treated” to plumes of smoke drifting around the west and north, about 30° above the horizon.
However, the rest of the sky was clear and when I picked NGC 7793 from my target list, it was because it was high in the sky and had just passed over the meridian, well away from the smoke.
That was five nights ago and these fires are still burning in the wilderness of Yerranderie State Conservation Area and beyond, less than fifteen kilometres away from our astro-observing site.
At home today, visibility due to the constant smoke haze has been down to about six kilometres and we have been advised by authorities to stay indoors where possible. They’ve been saying that for the last three weeks…. 😟
Image & Processing:
|Location: semi-dark rural.
Sky: mostly clear but occasional minor high cloud.
Wind: fairly calm.
Sky brightness: 0.21 e/pixel/sec .
Temp Min: 14°
Image acquisition: SharpCap.
Image post-processing: GIMP.
|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|
|Polar aligning:||QHYCCD PoleMaster||Polar Error:||1’ 59”|
[ZWO ASI071MC Pro]
Auto Exp Target Brightness=100
Images © Roger Powell