Astronomy:56 Aquilae

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Short description: K-type giant star in the constellation Aquila
56 Aquilae
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aquila
Right ascension  19h 54m 08.27657s[1]
Declination −08° 34′ 27.1592″[1]
Apparent magnitude (V) 5.79[2]
Characteristics
Evolutionary stage red giant branch[1]
Spectral type K5 III[3]
U−B color index +2.00[2]
B−V color index +1.664±0.006[4]
Astrometry
Radial velocity (Rv)−49.5±2.9[5] km/s
Proper motion (μ) RA: +6.321[1] mas/yr
Dec.: −19.121[1] mas/yr
Parallax (π)5.5025 ± 0.0807[1] mas
Distance593 ± 9 ly
(182 ± 3 pc)
Absolute magnitude (MV)−0.66[4]
Details
Mass1.23[6] M☉
Radius43[7] R☉
Luminosity896[1] L☉
Surface gravity (log g)1.02[8] cgs
Temperature3,885[8] K
Metallicity [Fe/H]−0.26[6] dex
Age13.4[8] Gyr
Other designations
56 Aql, BD−08°5150, FK5 2131, GC 2343, HD 188154, HIP 97928, HR 7584, SAO 143894[9]
Database references
SIMBADdata

56 Aquilae is a single[10] star in the equatorial constellation of Aquila. 56 Aquilae is its Flamsteed designation. Its apparent visual magnitude is 5.79,[2] meaning it is barely visible to the naked eye as a dim, orange-hued point of light, under ideal viewing conditions. The star is located at a distance of around 593 light years away from the Sun, based on parallax.[1] It is moving closer to the Earth with a heliocentric radial velocity of −50 km/s,[5] and is predicted to come as near as 222 light-years in around 3.3 million years.

This is an aging giant star with a stellar classification of K5 III,[3] having exhausted the supply of hydrogen at its core and expanded to 43 times the Sun's radius.[7] It is radiating 896 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 3,885 K.[8] 56 Aquilae is a double star,[11] but it does not appear to be a binary star system.[10] It is one of the double stars profiled in Admiral William Henry Smyth's 1864 work, Sidereal Chromatics.

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series 34: 1–49, Bibcode: 1978A&AS...34....1N. 
  3. ↑ 3.0 3.1 Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey 5, Bibcode: 1999MSS...C05....0H. 
  4. ↑ 4.0 4.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  5. ↑ 5.0 5.1 Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication (Washington: Carnegie Institution of Washington), Bibcode: 1953GCRV..C......0W. 
  6. ↑ 6.0 6.1 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G. et al. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics 691: A98. doi:10.1051/0004-6361/202451427. Bibcode: 2024A&A...691A..98K. 
  7. ↑ 7.0 7.1 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  8. ↑ 8.0 8.1 8.2 8.3 Kordopatis, G.; Schultheis, M.; McMillan, P. J.; Palicio, P. A.; De Laverny, P.; Recio-Blanco, A.; Creevey, O.; Álvarez, M. A. et al. (2023). "Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3". Astronomy and Astrophysics 669: A104. doi:10.1051/0004-6361/202244283. Bibcode: 2023A&A...669A.104K. 
  9. ↑ "56 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=56+Aql. 
  10. ↑ 10.0 10.1 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. 
  11. ↑ James, Andrew, The application of Admiral Smyth's "Sidereal Chromatics", http://homepage.mac.com/andjames/Page029j0.htm, retrieved 2007-12-22. 



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