Kappa Sagittarii

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The Bayer designation Kappa Sagittarii (Kappa Sgr, κ Sagittarii, κ Sgr) is shared by two star systems, κ¹ Sagittarii and κ² Sagittarii, in the constellation Sagittarius. The two star systems are separated by 0.46° in the sky.

κ¹ Sagittarii[edit]

Kappa¹ Sagittarii
Diagram showing star positions and boundaries of the Sagittarius constellation and its surroundings
Cercle rouge 100%.svg

Location of κ¹ Sagittarii (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius
Right ascension 20h 22m 27.5s
Declination -42° 02' 59"
Apparent magnitude (V) +5.60
Distance 244 ± 15 ly
(75 ± 5 pc)
Spectral type A0V
Other designations
κ¹ Sagittarii, κ¹ Sgr, Kappa¹ Sgr, CCDM J20224-4203A, CPD-42 9065, FK5 763, GC 28309, HD 193571, HIP 100469, HR 7779, IDS 20157-4222 A, PPM 326078, SAO 230177, WDS J20225-4203A.

Kappa¹ Sagittarii (Kappa¹ Sgr, κ¹ Sagittarii, κ¹ Sgr) is a triple star system lying 244 light years from Earth. The primary star, κ¹ Sagittarii A, is a spectral type A0 dwarf which has an apparent magnitude of +5.6. It is orbited by two companions, κ¹ Sagittarii B, a magnitude +12.6 star 31.7 arcseconds from the primary, and the magnitude +11.6 κ¹ Sagittarii C, which lies 52 arcseconds from A.

Kappa¹ Sagittarii is moving through the Galaxy at a speed of 28.6 km/s relative to the Sun. Its projected Galactic orbit carries it between 19,600 and 24,000 light years from the center of the Galaxy.[1]


κ² Sagittarii[edit]

Kappa² Sagittarii
Diagram showing star positions and boundaries of the Sagittarius constellation and its surroundings
Cercle rouge 100%.svg

Location of κ² Sagittarii (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius
Right ascension 20h 23m 53.2s
Declination -42° 25' 22"
Apparent magnitude (V) +5.64
Distance 371 ± 40 ly
(114 ± 12 pc)
Spectral type A3V
Other designations
κ² Sagittarii, κ² Sgr, Kappa² Sgr, CCDM J20239-4225AB, CPD-42 9068, GC 28341, HD 193807, HIP 100591, HR 7787, IDS 20171-4245 AB, PPM 326102, SAO 230184, WDS J20239-4225AB.

Kappa² Sagittarii (Kappa² Sgr, κ² Sagittarii, κ² Sgr)is a quadruple system 371 light years from Earth. κ² Sagittarii A is a spectral type A3 dwarf with an apparent magnitude of +5.64. It is orbited by a close 7th magnitude companion, κ² Sagittarii B, which is 0.8 arcseconds, or approximately 90 Astronomical Units, away from the primary. Orbiting this pair are two more stars, the 15th magnitude κ² Sagittarii C, with a separation of 15.0 arcseconds, and the 14th magnitude κ² Sagittarii D, which is 29.3 arcseconds from the primary.

Kappa² Sagittarii is It is moving through the Galaxy at a speed of 11.6 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,500 and 40,000 light years from the center of the Galaxy.[1]

References[edit]