SH2-261 (Steve Argereow)

Celestial hemisphere: Northern · Constellation: Orion (Ori) · Contains: 1021 Flammario · 11.82 · HD251597 · HD251652 · HD251680 · HD251704 · HD251732 · HD251767 · HD251900 · HD251924 · HD251925 · HD251979 · HD252004 · HD252088 · HD252089 · HD252135 · HD252245 · HD252333 · HD252359 · HD252360 · HD252387 · HD252540 · HD252650 · HD252678 · HD252791 · HD252816 · HD252841 · HD252842 · HD252871 · HD252905 · And 14 more.

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SH2-261

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SH2-261

I Imaged this last year with my 80mm APO so I gave it a go with my 127mm APO
and new Optolong L-Ultimate filter.

Sh2-261 (Sharpless 261) also known as Lower’s Nebula has only been discovered in 1939.
The Lowers (father and son) were amateur astronomers and found this nebula on one of
their photgraphic plates taken in 1939. It is a relatively faint region emitting doubly ionized
hydrogen, the nebula has an apparent diameter of about 50 arcminutes. There is no accurate
measurement as to the distance of this nebula, although best estimation is about 3.300 light years.

Information Credits: Corius Astronomy

Telescope: Explore Scientific 127mm f7.5
Explore Scientific X0.7 Reducer f/5.25 (667mm)
Mount IOptron CEM40

Camera ZWOASI6200MC-Pro Temp -10C, Binning 1 x 1, Gain 100 Offset 50
75 X 300 Second Exposures W/Optolong L-Extreme Filter (3nm)
30 Dark Frames/30 Flats
Total Integration Time: 6 Hours 15 Minutes
Acquisition with SharpCap
Stacked with Astro Pixel Processor
Guiding PHD2
Processed with Astra Image

North Carolina Astronomers
ZWO ASI 2600MC PRO
AstroBin Platform open discussions community forum

Please note: The following tables are updated every 24 hours.

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	Distinct awarded users	Total awarded images
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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
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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	6912402
PixInsight job	VFAUMF4UW1ZCP5DC96I3GYX7O9LX7G4T
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	06h09m03s.76
RA (top/left)	06h11m40s.78
RA (top/right)	06h06m13s.27
RA (bottom/right)	06h06m27s.94
RA (bottom/left)	06h11m53s.30

Dec (center)	+15°44′03″.5
Dec (top/left)	+16°23′28″.5
Dec (top/right)	+16°20′05″.7
Dec (bottom/right)	+15°04′27″.10
Dec (bottom/left)	+15°07′49″.6

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SH2-261

SH2-261

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SH2-261

SH2-261

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