Location of ξ Sagittarii (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18 57 20.47670 |
| Declination | −20° 39′ 22.8539″ |
| Apparent magnitude (V) | +5.06 |
| Characteristics | |
| Spectral type | B9/A0 Ib |
| U−B color index | −0.14 |
| B−V color index | +0.12 |
| Astrometry | |
| Proper motion (μ) | RA: −1.46 mas/yr Dec.: −5.75 mas/yr |
| Parallax (π) | 1.58 ± 0.26 mas |
| Distance | approx. 2,100 ly (approx. 600 pc) |
| Absolute magnitude (MV) | −3.92 |
| Details | |
| Mass | 7.8±0.1 M☉ |
| Radius | 15 R☉ |
| Luminosity | 2,753 L☉ |
| Surface gravity (log g) | 2.3 cgs |
| Temperature | 9,400 K |
| Metallicity | −0.20 dex |
| Rotational velocity (v sin i) | 10 km/s |
| Age | 39.8±4.9 Myr |
| Other designations | |
| ξ Sgr, 36 Sgr, BD−20° 5339, HD 175687, HIP 93057, HR 7145, SAO 187498 | |
| Database references | |
| SIMBAD | data |
Xi Sagittarii (ξ Sagittarii) is a solitary, blue-white hued star in the zodiac constellation of Sagittarius. It is visible to the naked eye with an apparent visual magnitude of +5.06. Based upon a small annual parallax shift of 1.58 mas as seen from Earth, this system is located roughly 2,100 light years from the Sun.
This is a massive supergiant star with a stellar classification of B9/A0 Ib. With an estimated 7.8 times the mass of the Sun and an age of about 40 million years it has depleted the hydrogen at its core, causing it to expand to about 15 times the Sun's radius. It is radiating 2,753 times the Sun's luminosity from its photosphere at an effective temperature of about 9,400 K.
References
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- ^ Fernie, J. D. (1983), "New UBVRI photometry for 900 supergiants", Astrophysical Journal Supplement Series, 52: 7, Bibcode:1983ApJS...52....7F, doi:10.1086/190856.
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- ^ Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
- ^ Venn, Kim A. (August 1995), "Atmospheric Parameters and LTE Abundances for 22 Galactic, A-Type Supergiants", Astrophysical Journal Supplement, 99: 659, Bibcode:1995ApJS...99..659V, doi:10.1086/192201.
- ^ 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.
- ^ Soubiran, C.; Le Campion, J.-F.; Cayrel de Strobel, G.; Caillo, A. (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.
- Royer, F.; et al. (January 2012), "Rotational velocities of A-type stars. I. Measurement of v sin i in the southern hemisphere", Astronomy and Astrophysics, 381 (1): 105–121, arXiv:astro-ph/0110490, Bibcode:2002A&A...381..105R, doi:10.1051/0004-6361:20011422, S2CID 13133418.
- "ksi01 Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-07-05.
- 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.
