Omega1 Aquarii

Omega¹ Aquarii
	Location of ω1 Aquarii (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Aquarius
Right ascension	23h 39m 47.06545s
Declination	–14° 13′ 19.7374″
Apparent magnitude (V)	4.96
Characteristics
Spectral type	A7 IV
B−V color index	+0.25
Astrometry
Radial velocity (Rv)	–2 km/s
Proper motion (μ)	RA: +54.147 mas/yr ; Dec.: −50.151 mas/yr
Parallax (π)	23.5523 ± 0.4848 mas
Distance	138 ± 3 ly ; (42.5 ± 0.9 pc)
Absolute magnitude (MV)	+1.78
Details
ω1 Aqr
Mass	1.88±0.04; 1.72 M☉
Radius	2.44+0.11; −0.25 R☉
Luminosity	14.8±0.3 L☉
Temperature	7,249+399; −150 K
Rotational velocity (v sin i)	105 km/s
Age	790 Myr; 600 Myr
ω1 Aqr B
Mass	0.85 M☉
Other designations
	ω1 Aqr, 102 Aquarii, BD–15 6471, HD 222345, HIP 116758, HR 8968, SAO 165818
Database references
SIMBAD	data

Omega¹ Aquarii, Latinized from ω¹ Aquarii, is the Bayer designation for a binary star in the equatorial constellation of Aquarius. With an apparent visual magnitude of 4.96,^[2] this star is faintly visible to the naked eye from the suburbs. The distance to this star can be estimated from the parallax as approximately 138 light-years (42 parsecs).^[1]

The stellar classification of this star is A7 IV,^[3] matching a subgiant star. It is spinning rapidly with a projected rotational velocity of 105 km/s.^[8] The star is about 600^[10] million years old and is radiating 15^[1] times the Sun's luminosity. It has 1.9^[6] times the mass of the Sun and 2.4^[1] times the Sun's radius. Previously thought to be a single star,^[9] in 2022 it was discovered to have a smaller companion, making it a binary star. The secondary star has a projected separation of about 1 astronomical unit away from the primary star.^[7]

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j 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.
^ ^a ^b ^c Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
^ ^a ^b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
^ 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.
^ 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.
^ ^a ^b Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
^ ^a ^b ^c Waisberg, Idel; Klein, Ygal; Katz, Boaz (2023). "Binarity and beyond in a stars – I. Survey description and first results of VLTI/GRAVITY observations of VAST targets with high Gaia–Hipparcos accelerations". Monthly Notices of the Royal Astronomical Society. 521 (4): 5232–5254. arXiv:2206.05251. Bibcode:2023MNRAS.521.5232W. doi:10.1093/mnras/stad872.
^ ^a ^b Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
^ ^a ^b De Rosa, R. J.; et al. (2014), "The VAST Survey - III. The multiplicity of A-type stars within 75 pc", Monthly Notices of the Royal Astronomical Society, 437 (2): 1216–1240, arXiv:1311.7141, Bibcode:2014MNRAS.437.1216D, doi:10.1093/mnras/stt1932.
^ ^a ^b Vican, Laura (June 2012), "Age Determination for 346 Nearby Stars in the Herschel DEBRIS Survey", The Astronomical Journal, 143 (6): 135, arXiv:1203.1966, Bibcode:2012AJ....143..135V, doi:10.1088/0004-6256/143/6/135, S2CID 118539505.
^ "* ome01 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-06-24.

External links

Image Omega1 Aquarii

[GaiaDR2-1] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j 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.

[mnrassa27_11-2] Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.

[houk1978-3] Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.

[gcsrv-4] 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.

[Anderson2012-5] 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.

[Zorec_Royer_2012-6] Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.

[Waisberg-7] Waisberg, Idel; Klein, Ygal; Katz, Boaz (2023). "Binarity and beyond in a stars – I. Survey description and first results of VLTI/GRAVITY observations of VAST targets with high Gaia–Hipparcos accelerations". Monthly Notices of the Royal Astronomical Society. 521 (4): 5232–5254. arXiv:2206.05251. Bibcode:2023MNRAS.521.5232W. doi:10.1093/mnras/stad872.

[aaa463_2_671-8] Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.

[DeRosa_et_al_2014-9] De Rosa, R. J.; et al. (2014), "The VAST Survey - III. The multiplicity of A-type stars within 75 pc", Monthly Notices of the Royal Astronomical Society, 437 (2): 1216–1240, arXiv:1311.7141, Bibcode:2014MNRAS.437.1216D, doi:10.1093/mnras/stt1932.

[aj143_6_135-10] Vican, Laura (June 2012), "Age Determination for 346 Nearby Stars in the Herschel DEBRIS Survey", The Astronomical Journal, 143 (6): 135, arXiv:1203.1966, Bibcode:2012AJ....143..135V, doi:10.1088/0004-6256/143/6/135, S2CID 118539505.

[SIMBAD-11] "* ome01 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-06-24.

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Omega1 Aquarii

References

External links

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