26 Aquarii

26 Aquarii
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
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
Distance	960 ± 40 ly ; (290 ± 10 pc)
Absolute magnitude (MV)	−1.98[2]
Details
Radius	54.5+3.5; −3.00[1] R☉
Luminosity	842±38[1] L☉
Surface gravity (log g)	1.2[4] cgs
Temperature	4,210+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
SIMBAD	data

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

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.
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.
Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
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, 123.
"26 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-16.
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.
Bartkevicius, A.; Lazauskaite, R. (December 1997), "Classification of Population II Stars in the Vilnius Photometric System. II. Results", Baltic Astronomy, 6: 499–572, Bibcode:1997BaltA...6..499B, doi:10.1515/astro-1997-0402.

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[GaiaDR2-1] 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.

[Anderson2012-2] 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.

[Houk1999-3] Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.

[Rebull2015-4] 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, 123.

[SIMBAD-5] "26 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-16.

[Eggleton2008-6] 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.

[Bartkevicius1997-7] Bartkevicius, A.; Lazauskaite, R. (December 1997), "Classification of Population II Stars in the Vilnius Photometric System. II. Results", Baltic Astronomy, 6: 499–572, Bibcode:1997BaltA...6..499B, doi:10.1515/astro-1997-0402.