IC 4685 in Sagittarius (Terry Robison)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: IC 1274 · IC 1275 · IC 4684 · IC 4685 · NGC 6559

Image of the day 03/15/2018

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IC 4685 in Sagittarius

Image of the day 03/15/2018

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IC 4685 in Sagittarius

IC4685 can be found in the constellation of Sagittarius. For reference, the Lagoon Nebula is only 1.25 degrees away. The estimated distance is about 4000 light years away. The image includes a dense star cloud with many colourful stars, and both emission and reflection nebula.

NGC 6559 located in the lower left part of the image resembles an oyster. IC4685 has that dark snaky river flowing through the nebula in the lower part of the image. A Hydrogen Alpha filter was used to get that nice contrasty look, highlighting the delicate filaments of the black rivers running through the nebula.

My favourite part of the image is IC1274 located just to the right and up from centre. It includes subtle milky white structures running across, a complete contrast to the dark river like areas in the lower left part of the image.

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

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	Distinct awarded users	Total awarded images
Image of the day
Top picks
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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
Deep sky
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Northern lights
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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
Backyard
Traveller
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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.

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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	Basic success
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Astrometry.net job	1957275
PixInsight job	n/a
PixInsight queue size	n/a
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Image of the day 03/15/2018

IC 4685 in Sagittarius

Image of the day 03/15/2018

IC 4685 in Sagittarius

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Image Index:

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Image of the day 03/15/2018

IC 4685 in Sagittarius

Image of the day 03/15/2018

IC 4685 in Sagittarius

Equipment

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