NGC 4945 (Terry Robison)

Celestial hemisphere: Southern · Constellation: Centaurus (Cen) · Contains: NGC 4945

Image of the day 07/13/2018

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NGC 4945

Image of the day 07/13/2018

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NGC 4945

This is NGC 4945, a large barred spiral galaxy located in the constellation Centaurus. It is the second brightest galaxy in the subgroup centred on Centaurus-A with an apparent magnitude of 9.3, and an apparent size of 20’.0 X 3’.8. NGC 4945 is about 13 million light-years distant, and is almost the size of our own Milky Way Galaxy. Both X-Ray and infrared observations have shown unusual high energetic emissions and star formation at its core. Like all happy galaxies, a super-massive black hole is thought to exist at its centre.

The data was a little tricky to work with, as it comes from 6 calibration streams (multiple cameras, all STL's), spanning about three years. Needless to say, it was a challenge to piece together.

When I first combined the data, it had a distinct mauve and dirty brown look about it. This was really unusual I thought. No matter what I did, it was present, so I followed the numbers. I managed to collect a reasonable amount of Ha in the process, and decided to add that into the mix as well. The Ha filter allows emission data to be easily identified. Look for the pinks and reds throughout the galaxy to identify these areas.

Ha 26 X 1200 Binned 1x1 - 8.66 hours

Lum 34 X 900 Binned 1x1 - 8.5 hours

Red 15 X 450 Binned 2X2 - 1.8 hours

Green 14 X 450 Binned 2X2 - 1.7 hours

Blue 16 X 450 Binned 2X2 - 2.0 hours

Total hours 22.66

Instruments Used:

10 Inch RCOS fl 9.1

Astro Physics AP-900 Mount

SBIG STL 11000m

FLI Filter Wheel

Astrodon Lum, Red, Green, Blue Filters

Baader Planetarium H-alpha 7nm Narrowband-Filter

Disclaimer: All data is pure end-to-end own work from equipment through acquisition through processing.

Astronomical Society of Victoria (ASV)
Objects of the South - negative declination only

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	Distinct awarded users	Total awarded images
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This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
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Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
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Professional, scientific grade data
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Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Basic success
Started	...
Astrometry.net job	2136142
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Image of the day 07/13/2018

NGC 4945

Image of the day 07/13/2018

NGC 4945

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Image of the day 07/13/2018

NGC 4945

Image of the day 07/13/2018

NGC 4945

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