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Chi³ Sagittarii
	Location of χ3 Sagittari (circled)
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Sagittarius
Right ascension	19h 25m 29.65949s
Declination	−23° 57′ 44.8390″
Apparent magnitude (V)	+5.448
Characteristics
Spectral type	K3 III
U−B color index	+1.662
B−V color index	+1.443
Variable type	suspected
Astrometry
Radial velocity (Rv)	+39.6 km/s
Proper motion (μ)	RA: −18.66 mas/yr ; Dec.: −12.73 mas/yr
Parallax (π)	6.53 ± 0.42 mas
Distance	500 ± 30 ly ; (153 ± 10 pc)
Absolute magnitude (MV)	−0.46
Details
Radius	37 R☉
Luminosity	301 L☉
Surface gravity (log g)	1.860 cgs
Temperature	4,040 K
Metallicity [Fe/H]	−0.10 dex
Other designations
	Chi3 Sgr, 49 Sgr, NSV 11992, CPD−24° 6723, HD 182416, HIP 95503, HR 7363, SAO 188105
Database references
SIMBAD	data

Chi³ Sagittarii (χ³ Sagittarii) is a solitary,^[11] orange-hued star in the zodiac constellation of Sagittarius. It is faintly visible to the naked eye with an apparent visual magnitude of +5.45.^[2] Based upon an annual parallax shift of 6.53 mas as seen from Earth,^[1] it is located roughly 500 light years from the Sun. It is receding from the Earth with a radial velocity of 39.6 km/s.^[5]

This is an evolved, K-type giant star with a stellar classification of K3 III.^[3] It is a suspected optical variable star with a magnitude range of 5.42 to 5.46.^[4] At infrared wavelengths, it shows large amplitude variation with a period of 505 days.^[12] The star has expanded to about 37^[7] times the Sun's radius and is radiating 301^[8] times the solar luminosity from its photosphere at an effective temperature of 4,040 K.^[9]

References

^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
^ ^a ^b ^c ^d Celis S., L. (October 1975), "Photoelectric photometry of late-type variable stars", Astronomy and Astrophysics Supplement Series, 22: 9–17, Bibcode:1975A&AS...22....9C.
^ ^a ^b Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
^ ^a ^b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
^ ^a ^b Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick (eds.), "The Revision of the General Catalogue of Radial Velocities", Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E.
^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
^ ^a ^b Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (2) (Third ed.): 521, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
^ ^a ^b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
^ ^a ^b ^c ^d Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247, S2CID 118362423.
^ "chi03 Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-07-04.{{cite web}}: CS1 maint: postscript (link)
^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
^ Price, Stephan D.; et al. (October 2010), "3.6 Years of DIRBE Near-infrared Stellar Light Curves", The Astrophysical Journal Supplement, 190 (2): 203, Bibcode:2010ApJS..190..203P, doi:10.1088/0067-0049/190/2/203, 203−219.