Lambda Sagittarii

λ Sagittarii
Location of λ Sagittarii (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius
Right ascension 18h 27m 58.24072s[1]
Declination −25° 25′ 18.1146″[1]
Apparent magnitude (V) +2.813[2]
Characteristics
Spectral type K1IIIb[3]
U−B color index +0.903[4]
B−V color index +1.045[4]
Astrometry
Radial velocity (Rv)−43.5[5] 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]
Distance78.2 ± 0.3 ly
(23.97 ± 0.09 pc)
Absolute magnitude (MV)0.76±0.03[2]
Details[6]
Mass1.79±0.20[2] M☉
Radius11.234±0.181 R☉
Luminosity58.79±2.61 L☉
Surface gravity (log g)2.66±0.10 cgs
Temperature4,768±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
SIMBADdata

Lambda Sagittarii (Latinized from λ Sagittarii), formally named Kaus Borealis /ˈkɔːs bɒriˈælɪs/,[7][8] is a star in the southern constellation of Sagittarius. The star marks the top of the Archer's bow.

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  2. ^ a b c Cite error: The named reference ottoni was invoked but never defined (see the help page).
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  4. ^ a b Cite error: The named reference sps1966 was invoked but never defined (see the help page).
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