Lambda Sagittarii information

λ Sagittarii
	Location of λ Sagittarii (circled)
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Sagittarius
Right ascension	18h 27m 58.24072s
Declination	−25° 25′ 18.1146″
Apparent magnitude (V)	+2.82
Characteristics
Spectral type	K0 IV
U−B color index	+0.903
B−V color index	+1.045
Astrometry
Radial velocity (Rv)	−43.5 km/s
Proper motion (μ)	RA: −44.76 mas/yr ; Dec.: −185.66 mas/yr
Parallax (π)	41.72 ± 0.16 mas
Distance	78.2 ± 0.3 ly ; (23.97 ± 0.09 pc)
Absolute magnitude (MV)	1.07±0.008
Details
Mass	2.6 M☉
Radius	11.234±0.181 R☉
Luminosity	58.79±2.61 L☉
Surface gravity (log g)	2.66±0.10 cgs
Temperature	4,768±36 K
Metallicity [Fe/H]	−0.11±0.03 dex
Rotational velocity (v sin i)	3.81 km/s
Other designations
	Kaus Borealis, λ Sgr, 22 Sagittarii, CPD−25 6523, FK5 692, GC 25180, HD 169916, HIP 90496, HR 6913, SAO 186841, PPM 268438
Database references
SIMBAD	data

Lambda Sagittarii (Latinized from λ Sagittarii), formally named Kaus Borealis /ˈkɔːs bɒriˈælɪs/,^[8]^[9] is a star in the southern constellation of Sagittarius. The star marks the top of the Archer's bow.

^ ^a ^b ^c ^d ^e Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference scfs was invoked but never defined (see the help page).
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^ ^a ^b Cite error: The named reference sps1966 was invoked but never defined (see the help page).
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^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
^ "IAU Catalog of Star Names". Retrieved 28 July 2016.

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[scfs-2] Cite error: The named reference scfs was invoked but never defined (see the help page).

[aj132_1_161-3] Cite error: The named reference aj132_1_161 was invoked but never defined (see the help page).

[sps1966-4] Cite error: The named reference sps1966 was invoked but never defined (see the help page).

[park2013-5] Cite error: The named reference park2013 was invoked but never defined (see the help page).

[Rains2020-6] Cite error: The named reference Rains2020 was invoked but never defined (see the help page).

[aaa190_1_148-7] Cite error: The named reference aaa190_1_148 was invoked but never defined (see the help page).

[Kunitzsch-8] Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.

[IAU-CSN-9] "IAU Catalog of Star Names". Retrieved 28 July 2016.

Observation data Epoch J2000.0 Equinox J2000.0
Location of λ Sagittarii (circled)
Constellation	Sagittarius
Right ascension	18^h 27^m 58.24072^s^[1]
Declination	−25° 25′ 18.1146″^[1]
Apparent magnitude (V)	+2.82^[2]
Characteristics
Spectral type	K0 IV^[3]
U−B color index	+0.903^[4]
B−V color index	+1.045^[4]
Astrometry

Radial velocity (R_v)	−43.5^[2] km/s
Proper motion (μ)	RA: −44.76^[1] mas/yr Dec.: −185.66^[1] mas/yr
Parallax (π)	41.72 ± 0.16 mas^[1]
Distance	78.2 ± 0.3 ly (23.97 ± 0.09 pc)
Absolute magnitude (M_V)	1.07±0.008^[5]

Details^[6]

Mass	2.6^[7] `M`_☉
Radius	11.234±0.181 `R`_☉
Luminosity	58.79±2.61 `L`_☉
Surface gravity (log g)	2.66±0.10 cgs
Temperature	4,768±36 K
Metallicity [Fe/H]	−0.11±0.03 dex
Rotational velocity (v sin i)	3.81 km/s

Other designations
Kaus Borealis, λ Sgr, 22 Sagittarii, CPD−25 6523, FK5 692, GC 25180, HD 169916, HIP 90496, HR 6913, SAO 186841, PPM 268438
Database references
SIMBAD	data

Lambda Sagittarii information

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