Chi Sagittarii

The Bayer designation Chi Sagittarii (Chi Sgr, χ Sagittarii, χ Sgr) is shared by three star systems in the constellation Sagittarius. The brightest of these, χ¹ Sagittarii and χ³ Sagittarii, are separated by 0.56° on the sky. The dimmer χ² Sagittarii is located between them, 0.10° from χ¹. The Wow! signal came from the direction of these stars.

χ¹ Sagittarii

Chi¹ Sagittarii
Diagram showing star positions and boundaries of the Sagittarius constellation and its surroundings


Location of χ¹ Sagittari (circled)

Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius
Right ascension 19h 25m 16.5s
Declination -24° 30' 31"
Apparent magnitude (V) +5.02
Absolute magnitude (V)+0.86
Distance221 ± 17 ly
(68 ± 5 pc)
Spectral typeA4IV/V
Other designations
χ¹ Sagittarii, χ¹ Sgr, Chi¹ Sgr, 47 Sagittarii, CCDM J19253-2431AB, CPD-24  6721, GC 26789, HD 182369, HIP 95477, HR 7362, IDS 19192-2442 AB, PPM 269762, SAO 188101, WDS J19253-2431AB.

Chi¹ Sagittarii (Chi¹ Sgr, χ¹ Sagittarii, χ¹ Sgr) is a binary star. The primary is a spectral type A5 dwarf. The companion is approximately 0.12 arcseconds from the primary, putting it about 8 Astronomical Units away. The orbital period is 10.8 years. The combined apparent magnitude of the system is +5.02. It is approximately 220 light years from Earth.

χ² Sagittarii

Chi² Sagittarii
Diagram showing star positions and boundaries of the Sagittarius constellation and its surroundings


Location of χ² Sagittari (circled)

Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius
Right ascension 19h 25m 22.3s
Declination -24° 24' 44"
Apparent magnitude (V) +7.27
Absolute magnitude (V)-0.57
Distance1200 ± 500 ly
(370 ± 150 pc)
Spectral typeB7IV
Other designations
χ² Sagittarii, χ² Sgr, Chi² Sgr, 48 Sagittarii, CPD-24  6722, GC 26793, HD 182391, HIP 95486, PPM 269764, SAO 188102

Chi² Sagittarii (Chi² Sgr, χ² Sagittarii, χ² Sgr) is a spectral type B7 subgiant which has an apparent magnitude of +7.26. It is approximately 1200 light years from Earth.

χ³ Sagittarii

Chi³ Sagittarii
Diagram showing star positions and boundaries of the Sagittarius constellation and its surroundings


Location of χ³ Sagittari (circled)

Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius
Right ascension 19h 25m 29.7s
Declination -23° 57' 44"
Apparent magnitude (V) +5.45
Absolute magnitude (V)-0.50
Distance506 ± 81 ly
(155 ± 25 pc)
Spectral typeK3III
Other designations
χ³ Sagittarii, χ³ Sgr, Chi³ Sgr, 49 Sagittarii, CPD-24  6723, GC 26801, HD 182416, HIP 95503, HR 7363, PPM 269765, SAO 188105,

Chi³ Sagittarii (Chi³ Sgr, χ³ Sagittarii, χ³ Sgr) is a spectral type K3 giant which has an apparent magnitude of +5.45. It is 506 light years from Earth.

Name and etymology

References


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