NGC 4945 AKA Caldwell 83 (Daniel Stern)

Celestial hemisphere: Southern · Constellation: Centaurus (Cen) · Contains: HD113484 · NGC 4945

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NGC 4945 AKA Caldwell 83

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NGC 4945 AKA Caldwell 83

NGC 4945, AKA Caldwell 83, is an edge-on spiral galaxy that has been described as a “twin” of the Milky Way. NGC 4945 is a composite galaxy in that it has both extreme starburst activity and a Seyfert-powered nucleus, and is therefore considered to be a bit of an anomaly. It’s unknown which energy source dominates. A Seyfert galaxy is a type of spiral galaxy characterized by a bright and highly active nucleus and is believed to host supermassive black holes at their centers. A starburst galaxy is a type of galaxy that is undergoing an exceptionally high rate of star formation, resulting in a burst of new stellar birth. In starburst galaxies, the intensity of star formation is significantly higher than in typical galaxies. In this case there is an unusual amount of visual evidence of starburst activity by the presence of ionized hydrogen (Ha), the reddish clumps throughout the image. On the other hand, X-ray observations favor a Seyfert-powered nucleus. So the energy conundrum posed by NGC 4945 persists.

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Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

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
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

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
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
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.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
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	Advanced success
Started	...
Astrometry.net job	9536691
PixInsight job	FCW9P1PJFNI0VFN8PKNGXQ0HFH66KJX1
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	13h05m21s.848
RA (top/left)	13h07m07s.782
RA (top/right)	13h04m20s.237
RA (bottom/right)	13h03m35s.192
RA (bottom/left)	13h06m24s.130

Dec (center)	-49°28′43″.13
Dec (top/left)	-49°18′36″.70
Dec (top/right)	-49°11′25″.68
Dec (bottom/right)	-49°38′43″.89
Dec (bottom/left)	-49°45′57″.59

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NGC 4945 AKA Caldwell 83

NGC 4945 AKA Caldwell 83

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Image Index:

Contribution Index (beta):

NGC 4945 AKA Caldwell 83

NGC 4945 AKA Caldwell 83

Equipment

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