Astronomy:56 Sagittarii
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 19h 46m 21.73912s[1] |
| Declination | −19° 45′ 40.0132″[1] |
| Apparent magnitude (V) | 4.87[2] |
| Characteristics | |
| Evolutionary stage | horizontal branch[3] |
| Spectral type | K0+III[4] |
| U−B color index | +0.96[5] |
| B−V color index | +1.06[5] |
| Astrometry | |
| Radial velocity (Rv) | +22.07[6] km/s |
| Proper motion (μ) | RA: −129.40[1] mas/yr Dec.: −90.55[1] mas/yr |
| Parallax (π) | 15.71 ± 0.23[1] mas |
| Distance | 208 ± 3 ly (63.7 ± 0.9 pc) |
| Absolute magnitude (MV) | 0.85[2] |
| Details | |
| Mass | 1.77[7] M☉ |
| Radius | 11[6] R☉ |
| Luminosity | 58.97[2] L☉ |
| Surface gravity (log g) | 2.58[8] cgs |
| Temperature | 4,750[9] K |
| Metallicity [Fe/H] | −0.07[8] dex |
| Rotational velocity (v sin i) | 1.9[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
56 Sagittarii is a single[11] star in the southern constellation of Sagittarius. It has the Bayer designation f Sagittarii, while 56 Sagittarii is the Flamsteed designation. This object is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4.87.[2] It is located approximately 208 light years away from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +22 km/s.[6]
This is an aging giant star with a stellar classification of K0+III,[4] having exhausted the supply of hydrogen at its core and expanded to 11[6] times the Sun's radius. It is a red clump giant,[3] which means it is on the horizontal branch and is generating energy through helium fusion at its core. The star has 1.8[7] times the mass of the Sun and is radiating 59[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,750 K.[9]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. Vizier catalog entry
- ↑ 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. Vizier catalog entry
- ↑ 3.0 3.1 Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal 539 (2): 732–741, doi:10.1086/309278, Bibcode: 2000ApJ...539..732A
- ↑ 4.0 4.1 Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K.
- ↑ 5.0 5.1 Mermilliod, J. C. (2006). "Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie 2168. Bibcode: 2006yCat.2168....0M.Vizier catalog entry
- ↑ 6.0 6.1 6.2 6.3 6.4 Massarotti, Alessandro et al. (January 2008). "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity". The Astronomical Journal 135 (1): 209–231. doi:10.1088/0004-6256/135/1/209. Bibcode: 2008AJ....135..209M.
- ↑ 7.0 7.1 Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics 352: 555–562. Bibcode: 1999A&A...352..555A. Vizier catalog entry
- ↑ 8.0 8.1 Wu, Yue et al. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics 525: A71. doi:10.1051/0004-6361/201015014. Bibcode: 2011A&A...525A..71W.
- ↑ 9.0 9.1 Gontcharov, G. A. (2009). "Red giant clump in the Tycho-2 catalogue". Astronomy Letters 34 (11): 785–796. doi:10.1134/S1063773708110078. Bibcode: 2008AstL...34..785G. Vizier catalog entry
- ↑ "f Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=f+Sgr.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
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