IC4603/4604: Light and Shadows (Mathew Ludgate)

Celestial hemisphere: Southern · Constellation: Ophiuchus (Oph) · Contains: 5 Oph · 5 rho Oph · B42 · HD147384 · HD147414 · HD147432 · HD147681 · HD147888 · HD147889 · HD147932 · IC 4603 · IC 4604 · LBN 1109 · LBN 1111 · LBN 1112 · LDN 1681 · LDN 1686 · LDN 1687 · LDN 1688 · LDN 1690 · LDN 1692 · The star ρ Oph · rho Oph Nebula

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IC4603/4604: Light and Shadows

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IC4603/4604: Light and Shadows

IC4603 and 4604 are prominent reflection nebula located within the magnificent Rho Ophiuchi complex. This is a major star forming region, and the combination of the numerous dense dust clouds and bright reflections creates a spectacular vista of light and shadow.

Interestingly, the dense dust clouds block a lot of the usual background star field, and the stars that are visible are predominately dimmer and have a red hue. This may be from extinction from the intervening dust or they may be younger T Tauri stars. T Tauri stars have only recently formed and are a lower temperature giving them their strong red hue.

This is actually the first pure RGB image I have taken with the Nikon 400mm lens, so was a bit of a test to see how it went.

Camera Lens Astrophotography

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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
Deep sky
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	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
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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.
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	7888199
PixInsight job	MSWGAGHJ4KCO7NAUIBSBN1NRLQ3C4EBG
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	16h25m05s.252
RA (top/left)	16h22m20s.273
RA (top/right)	16h22m27s.194
RA (bottom/right)	16h27m47s.985
RA (bottom/left)	16h27m45s.810

Dec (center)	-23°57′30″.84
Dec (top/left)	-24°52′33″.83
Dec (top/right)	-23°01′37″.88
Dec (bottom/right)	-23°02′17″.32
Dec (bottom/left)	-24°53′15″.96

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IC4603/4604: Light and Shadows

IC4603/4604: Light and Shadows

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IC4603/4604: Light and Shadows

IC4603/4604: Light and Shadows

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