Arcturus (Alpha Boötis) (Tom Wildoner)

Celestial hemisphere: Northern · Constellation: Boötes (Boo) · Contains: 16 Boo) · 16 alf Boo · Arcturus · HD124569 · HD124897 · HD124953 · The star Arcturus (α Boo

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Arcturus (Alpha Boötis)

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Arcturus (Alpha Boötis)

What is that bright star high in the Western sky after sunset? Say hello to Arcturus (a red giant star), also known as Alpha Boötis (the brightest star in the constellation Boötis). It is the brightest star in the northern celestial hemisphere. It has a visual magnitude of −0.04, and is the fourth brightest star in the night sky. The name Arcturus comes from the Greek meaning "keeper or guardian of the bear", which refers to the its position adjacent to the tail of the constellation Ursa Major (the Great Bear).

Distance to Earth: 36.66 light years
Magnitude: -0.04
Radius: 10.98 million mi
Surface temperature: 4,290 K
Constellation: Boötes
Spectral type: K1.5IIIFe-0.5
Coordinates: RA 14h 15m 40s | Dec +19° 10′ 56″

Tech Specs: Sky-Watcher Esprit 120ED Telescope, ZWO AS2600mc-Pro running at 0C, Sky-Watcher EQ6R-Pro mount, Optolong L-eNhance filter (2”), 6 x 300 second exposures, guided using a ZWO 30mm f/4 mini guide scope and ZWO 120 Mini, focus with a ZWO EAF, controlled with a ZWO ASIAir Pro. Processed using PixInsight and DSS. Image Date: May 29, 2022. Location: The Dark Side Observatory, Weatherly, PA, USA (Bortle Class 4).

The refractors!

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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

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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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Star trails
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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
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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	5989741
PixInsight job	GQOO92EO60SJRH36ZA0T6ZQQM1HS2LIE
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	14h15m41s.963
RA (top/left)	14h12m47s.633
RA (top/right)	14h14m17s.110
RA (bottom/right)	14h18m34s.624
RA (bottom/left)	14h17m08s.240

Dec (center)	+19°11′01″.13
Dec (top/left)	+19°49′39″.70
Dec (top/right)	+18°18′14″.43
Dec (bottom/right)	+18°32′15″.61
Dec (bottom/left)	+20°03′47″.32

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Arcturus (Alpha Boötis)

Arcturus (Alpha Boötis)

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Arcturus (Alpha Boötis)

Arcturus (Alpha Boötis)

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