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26 Aquarii

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

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

Houk and Swift (1999) listed a stellar classification of K2(III) 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. 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.

References

  1. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ 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.
  3. ^ 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. ^ Rebull, Luisa M.; et al. (October 2015), "On Infrared Excesses Associated with Li-rich K Giants", The Astronomical Journal, 150 (4): 45, arXiv:1507.00708, Bibcode:2015AJ....150..123R, doi:10.1088/0004-6256/150/4/123, S2CID 46595131, 123.
  5. ^ "26 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-16.
  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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  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, Bibcode:1997BaltA...6..499B, doi:10.1515/astro-1997-0402.
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