The three Asellus Stars in Bootes (Michael Kraus)

Celestial hemisphere: Northern · Constellation: Boötes (Boo) · Contains: 17 Boo A) · 17 Boo B · 17 kap01 Boo · 17 kap02 Boo · 21 Boo) · 21 iot Boo · 23 Boo) · 23 tet Boo · Asellus Primus · Asellus Secondus · Asellus Tertius · NGC 5624 · The star Asellus Primus (θ Boo · The star Asellus Secundus (ι Boo · The star Asellus Tertius (κ2 Boo · The star κ1 Boo

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The three Asellus Stars in Bootes

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The three Asellus Stars in Bootes

A bit off the known objects here a star field in constellation of Bootes.

The three asses. Asellus Primus, Asellus Secundus and Asellus Tertius.

I did some research on this and found the following:

- Asellus Primus (Theta Bootis): distance about 47 lightyears, 4.1 mag, spectral class F7
- Asellus Secundus (Iota Bootis): distance about 95 lightyears, 8.27 mag, spectral class A9V
- Asellus Tertius (Kappa Bootis): Is a double star consisting of a star of spectral class A8 IV with an apparent magnitude of 4.54 mag and a somewhat fainter one of spectral class F1 V and magnitude 6.58 mag. Distance about 155 lightyears.

All three stars also called "The Sky Lance" - known as Tian Quang - are a Chinese star cluster consisting of Theata Bootis, Iota Bootis and Kappa Bootis.
They are not part of the constellation Bootis, but is located within the constellation's boundaries.

Asellus Primus was the star closest to the celestial north pole from 4300 BC to 3942 BC.
Although visible to the naked eye, it remained too faint to be considered a pole star.

The famous Pinwheel Galaxy (M101) is just a few fingerbreadths above it!

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Status	Advanced success
Started	...
Astrometry.net job	7810468
PixInsight job	4B036FO7GFOT8QIR5Q3PB8I29DCFNUQV
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	14h18m51s.40
RA (top/left)	14h09m49s.70
RA (top/right)	14h27m52s.67
RA (bottom/right)	14h28m20s.50
RA (bottom/left)	14h09m23s.55

Dec (center)	+51°51′16″.5
Dec (top/left)	+50°45′53″.2
Dec (top/right)	+50°45′44″.7
Dec (bottom/right)	+52°53′57″.9
Dec (bottom/left)	+52°54′07″.7

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