Astronomy:26 Aquarii

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Short description: Star in the constellation Aquarius
26 Aquarii
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Aquarius
Right ascension  21h 42m 10.11292s[1]
Declination +01° 17′ 06.9019″[1]
Apparent magnitude (V) 5.66[2]
Characteristics
Spectral type K2(III)[3]
B−V color index 1.446±0.008[2]
Astrometry
Radial velocity (Rv)+8.15±0.19[2] km/s
Proper motion (μ) RA: −4.298[1] mas/yr
Dec.: −7.530[1] mas/yr
Parallax (π)3.4044 ± 0.1310[1] mas
Distance960 ± 40 ly
(290 ± 10 pc)
Absolute magnitude (MV)−1.98[2]
Details
Radius54.5+3.5
−3.00[1] R☉
Luminosity842±38[1] L☉
Surface gravity (log g)1.2[4] cgs
Temperature4,210+121
−129[1] K
Rotational velocity (v sin i)3.2[4] km/s
Other designations
BD+00°4770, GC 30377, HD 206445, HIP 107144, HR 8287, SAO 126997[5]
Database references
SIMBADdata

26 Aquarii is a single[6] star located approximately 960[1] light years away from the Sun in the zodiac constellation of Aquarius. 26 Aquarii is the Flamsteed designation.[5] It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.66.[2] This object is moving away from the Earth with a heliocentric radial velocity of +8 km/s.[2]

Houk and Swift (1999) listed a stellar classification of K2(III)[3] for 26 Aquarii, corresponding to an evolved K-type giant of uncertain luminosity class. Bartkevicius and Lazauskaite (1997) found spectral traits of MD-Ba?-K3 II–III, K2 Ia, suggesting some type of giant K-type star with a suspected metal deficiency (MD) of barium.[7] It has 54.5 times the Sun's radius and is radiating 842 times the luminosity of the Sun from its photosphere at an effective temperature of 4,210 K.[1]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  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 Rebull, Luisa M. et al. (October 2015), "On Infrared Excesses Associated with Li-rich K Giants", The Astronomical Journal 150 (4): 45, doi:10.1088/0004-6256/150/4/123, 123, Bibcode: 2015AJ....150..123R. 
  5. ↑ 5.0 5.1 "26 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=26+Aqr. 
  6. ↑ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  7. ↑ Bartkevicius, A.; Lazauskaite, R. (December 1997), "Classification of Population II Stars in the Vilnius Photometric System. II. Results", Baltic Astronomy 6 (4): 499–572, doi:10.1515/astro-1997-0402, Bibcode: 1997BaltA...6..499B. 



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